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FOOD SCIENCE AND TECHNOLOGY

FOOD CHEMISTRY

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FOOD CHEMISTRY

D

ONGFENG WANG

H

ONG LIN

JIANQIAN KAN

LINWEI LIU

XIAOXING ZENG AND

S

HENGRONG SHEN

EDITORS

New York

Copyright © 2012 by Nova Science Publishers, Inc.

All rights reserved. No part of this book may be reproduced, stored in a retrieval system or transmitted in any form or by any means: electronic, electrostatic, magnetic, tape, mechanical photocopying, recording or otherwise without the written permission of the Publisher.

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The Publisher has taken reasonable care in the preparation of this book, but makes no expressed or implied warranty of any kind and assumes no responsibility for any errors or omissions. No liability is assumed for incidental or consequential damages in connection with or arising out of information contained in this book. The Publisher shall not be liable for any special, consequential, or exemplary damages resulting, in whole or in part, from the readers‘ use of, or reliance upon, this material. Any parts of this book based on government reports are so indicated and copyright is claimed for those parts to the extent applicable to compilations of such works.

Independent verification should be sought for any data, advice or recommendations contained in this book. In addition, no responsibility is assumed by the publisher for any injury and/or damage to persons or property arising from any methods, products, instructions, ideas or otherwise contained in this publication.

This publication is designed to provide accurate and authoritative information with regard to the subject matter covered herein. It is sold with the clear understanding that the Publisher is not engaged in rendering legal or any other professional services. If legal or any other expert assistance is required, the services of a competent person should be sought. FROM A DECLARATION OF PARTICIPANTS JOINTLY ADOPTED BY A COMMITTEE OF THE AMERICAN BAR ASSOCIATION AND A COMMITTEE OF PUBLISHERS.

Additional color graphics may be available in the e-book version of this book.

Library of Congress Cataloging-in-Publication Data

Food chemistry / editors, Dongfeng Wang ... [et al.]. p. cm.

Includes index.

ISBN: (eBook)

1. Food Analysis. 2. Food Composition. I. Wang, Dongfeng. TX531.F555 2011 664'.07 dc23

2011042522

Published by Nova Science Publishers, Inc. † New York

CONTENTS

Jianqian Kan and Guoqing

Dongfeng Wang, Jipeng Sun, Guoqing Huang, Xiaolin Zhou and Liping Sun

Shengrong Shen, Dongfeng Wang and Undurti N. Das

Hong Lin, Lisha Wu and Shuhui Wang

Yibin Zhou, Dongfeng Wang and Ping Dong

Dongfeng Wang, Lina Yu, Haiyan Li, Bin Zhang, Shuhui Wang and Xingguo Liang

Zeng and Guaoqing Huang

Linwei Liu and Shiyuan Dong

PREFACE

Foods consist of a large quantity of compounds, of which, some are original from plant or animal materials, some are new ones generated during processing or preservation, some are intentionally added by manufacturers, and some are contaminants produced during processing, preservation or packaging. These compounds undergo various changes during processing and storage and it is hence necessary to understand the effects of processing or storage on these compounds so as to enhance the nutrition, palatability and safety of foods The purpose of Food Chemistry is to elucidate the structure, physicochemical properties, nutrition and safety of major food constituents and their changes occurred during processing and storage. Due to the extreme importance, Food Chemistry has been accepted as a major fundamental course for food-related majors.

Though food chemistry has a history of more than 200 years, it developed into a relatively independent system in the late 1960‘s. Since then, the United States, Japan, Germany and other countries published several authoritative food chemistry textbooks, including Latest Food Chemistry edited by Hayashi Junzo and Kitamura Mitsuo (Japan), Food Chemistry by Sakurai Yoshito (Japan), Food Chemistry by Owen R. Fennema (United States), Food Chemistry by Belitz HD (Germany), Food Chemistry by Zhang Wang (China), and Food Chemistry by Dongfeng Wang (China). Of the works, the publications edited by Fennema and Belitz HD have been widely chosen by university students as textbook. However, the two books contain too many contents and part of them overlaps with those stated in Biochemistry and Organic Chemistry. Besides, the two books are too expensive for readers in developing countries.

Hence, there is an urgent demand to publish a simplified Food Chemistry textbook that most university students can afford, which is the case of this book. This book presents the chemistry and properties of the six essential nutrients contained in foods, including water, carbohydrates, lipids, proteins, vitamins and minerals, and their changes occurred during food processing and storage. In addition, this book also deals with the chemistry and properties of flavors, food additives and toxic substances in foods. This book is simplified and cheaper than previously published books without reducing its academic level, and reflects the latest advances in food chemistry. This work can be used as a textbook by university students and especially suitable for students in developing countries and non-English speaking countries for bilingual delivery.

The authors would like to thank the postgraduates of the Laboratory of Food Chemistry and Nutrition of Ocean University of China, including Mei Ding, Yan Li, Lu Yu, Xingya Li,

Wang, Hong Lin, Jianqian Kan et al.

Xiang Gao, Wen Zhou, Zhe Xu, Min Wang, Mengqi Li, and Chunsheng Li, for assistance in literature collection and typesetting, and Ocean University of China for funding the publication

Dongfeng

CONTRIBUTORS

Undurti N Das

Jawaharlal Nehru Technological University, Kakinada-533 003, India

Liping Sun

College of Chemistry and Engineering, Kunming University of Science and Technology, Yunnan Province, China

Jipeng Sun

Third Institute of Oceanography State Oceanic Administration, Xiamen, China

Lina Yu

Shandong Peanut Research Institute, Qingdao, China

Xiaoling Zhou

Medical College of Shantou University, Shantou, Guangdong Province, China

Bin Zhang

School of Food and Pharmacy & Medical School, Zhejiang Ocean University, Zhushang City, Zhejiang Province, China

Haiyan Li

College of Food Science and Engineering, Ocean University of China, Qingdao, China

Banping Wang

College of Food Science and Engineering, Ocean University of China, Qingdao, China

Xingguo Liang

College of Food Science and Engineering, Ocean University of China, Qingdao, China

ABOUT THE EDITORS

Dongfeng Wang is a professor of the College of Food Science and Engineering at the Ocean University of China. He has published many books related to food chemistry as editorin-chief, including Food Chemistry (2007), Advanced Food Chemistry (2009), Chemistry of Toxic Substances in Foods (2005), Technology of Experiment & Study of Tea Biochemistry (1997), Experiments on Food Quality & Food Safety (2004) and Technology of Experiments on Food Science and Engineering (2007). He has published over 120 original papers that reflect his research interests in food chemistry, tea biochemistry, carbohydrate chemistry, and preservation. He has received many teaching & academic honors, including The Second Prize for Advanced Science and Technology of China in 2010, The First Prize for Advanced Science and Technology from Ministry of Education of the People‘s Republic of China in 2009, Distinguished Teacher Awards from Shandong Province of China in 2006, and Award for Young Scientists from Anhui Province in 2000. Professor Wang received his BS degree of agriculture in 1982 from Anhui Agricultural College (Anhui, China), the MS degree of tea biochemistry in 1988 from Zhejiang Agricultural University (Zhejiang, China), and the PhD degree of inorganic biochemistry of food in 1999 from University of Science and Technology of China (Hefei, China)

Jianquan Kan is a professor of the College of Food Science at Southwest University of China. He is the editor-in-chief of many books related to food chemistry, including The Practical Chemistry of Oil and Fat (1997), Food Chemistry (2002, revised in 2006 and 2008), Advanced Food Chemistry (2011), An Introduction to Food Safety (2009), Food Analysis (2011) and Experimental Methods (2011). He is the author or corresponding author of over 140 original papers covering food chemistry, food analysis and nutrition. He has been honored the Second-Class Prize of Chongqing Science and Technology Advancement (2009) and the Second Chongqing Academic and Technological Leader (2008) Professor Kan received the BS degree of chemistry from Nanchong Normal College (Sichuan, China) in 1986, the MS degree of Product Processing and Storage from Southwest Agricultural University (Chongqing, China) in 1992, and the PhD degree of Product Processing and Storage from Southwest Agricultural University (Chongqing, China) in 2003.

Lingwei Liu is a professor of the College of Food Science & Engineering in Northwest A&F University, Yangling, ShaanXi, China He has done intensive researches related to food chemistry, food analysis, nutrition and food safety. Professor Liu received the BS degree of food science from Northwest Agriculture University (ShaanXi, China) in 1982 and the PhD

degree of food science from Northwest Agriculture & Forest University (ShaanXi, China) in 1995.

Hong Lin received the BS degree in 1984, the MS degree in 1990, and the PhD degree in 1998 in seafood science from the Ocean University of China. Professor Lin is a famous expert in the seafood safety field and his research area covers novel marine organism-derived chemical and biological hazard discovery, quality control during seafood processing, and fast hazard detection method development. Professor Lin has been granted 4 invention patents, published more than 100 original articles, and edited 4 academic books, including Seafood Safety (2010), Aquatic Nutrition and Safety (2007), Effective Use of Aquatic Resources (2007), and Fish Preservation Technologies (2000).

Xiaoxiong Zeng received the BS degree from Hunan Agricultural University in 1985, the MS degree from Zhejiang Agricultural University in 1988, and the PhD degree from Shizuoka University (Shizuoka, Japan) in 2000. Dr. Zeng is now a professor of the College of Food Science and Technology, Nanjing Agricultural University, China. He is one of the authors or corresponding author of over 100 original papers related to food chemistry, food biotechnology and glycobiology.

Shengrong Shen is a professor of the School of Biosystems Engineering and Food Science of Zhejiang University. Professor Shen was granted the PhD degree by the Department of Biophysics of Zhejiang University in 1997. His research area includes structural analysis of such bioactive compounds as lipids, fatty acids, and polyphenols. He has published more than 100 original papers concerning food chemistry, food safety and applied nutrition in the latest 10 years Besides, professor Shen has published 5 academic books related to food and health, tea biochemistry and food chemistry.

Yibin Zhou is a professor of the Department of Food Science and Engineering at Anhui Agricultural University, Anhui, China. He had edited Food Chemistry (in Chinese) as an assistant, and is the author or corresponding author of over 40 original papers on carbohydrates, food engineering, and biotechnology.

Guoqing Huang is a lecturer of the College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China.

Shiyuan Dong is a lecturer of the College of Food Science and Engineering, Ocean University of China, Qingdao, China.

Shuhui Wang is a PhD candidate in Biosystems Engineering Department College of Agriculture - Ginn College of Engineering, Aubum University, Auburn, AL 36849-5417, USA

In: Food Chemistry ISBN: 978-1-61942-125-7

Editors: D.Wang, H. Lin, J. Kan et al. © 2012 Nova Science Publishers, Inc.

Chapter 1

INTRODUCTION

College of Food Science and Engineering, Ocean University of China, Qingdao, China

ABSTRACT

Food Chemistry is a fundamental discipline for students, engineers, and professionals engaged in the food industry. This chapter provides an overview of this discipline, including its definition, purpose, development, and its role in food science and engineering

1.1. Food Chemistry and Its History

1.1.1.

What Is Food Chemistry

Nutrients refer to the indispensable substance that provides nourishment essential for maintenance of life, growth and development of human being. The human body needs a lot of nutrients. Based on chemical structure, the nutrients can be divided into six major categories, including water, carbohydrates, proteins, lipids, vitamins and minerals

A minor difference between terms foodstuff and food should be noted first. Foodstuff refers to materials containing nutrients; while foods are materials that have been processed from foodstuff (ranging from simple cleaning to a modern factory processing) in order to meet people‘s nutritional and sensory requirements. In another word, a food shall be characterized by both nutrition and sensory satisfaction

The nutritional compositions of foods can be determined easily, but sensory satisfaction is a much complex issue and is related to the color, texture, and shape, flavor of foods in addition to the cultural background and dietary habits of consumers.

The chemical compositions of foods are very complex (Figure 1-1). Of the components, some are intrinsic in animal or plant materials, some are generated during processing and storage, some are intentionally added by manufacturers, some are contaminants originated from the environment or microorganisms, and some are migrated from packing materials of

food. The purpose of Food Chemistry is to elucidate the structure, physical and chemical properties, nutritional value as well as safety of these components, their changes undergone during storage and processing, and the effects of these changes on food nutrition and palatability. The knowledge is of great importance in improving food quality, developing new food resources, evolving food processing and storage technologies, upgrading food packaging materials, and increasing food safety and quality

Water

Carbohydrates

Proteins

Lipids

Minerals

Vitamins

Pigments

Hormones

Flavor components

Toxic substances

Figure 1-1 Composition of foods

Natural additives

Food Addtives

Contaminants

Food Chemistry is a comprehensive discipline and partially overlaps with chemistry, biochemistry, physical chemistry, botany, zoology, food nutrition, food safety, polymer chemistry, environmental chemistry, toxicology, molecular biology, and many other subjects. Food Chemistry associates the most closely with chemistry and biochemistry and it is the extension of the two subjects to the food area. However, the subjects have different contents and focuses. The chemistry subject deals mainly with the composition, property, and reactions of molecules, biochemistry focuses on the reactions and changes of various components in organisms under suitable or moderately suitable conditions, while food chemistry is interested in the changes of components occurred in such unsuitable conditions as freezing, heating, and drying, their interactions during these processes, and the effects of these changes on the nutrition, safety, and sensory properties (such as color, flavor, taste, and shape) of foods.

Synthetic additives

From processing

From environmental pollution

1.1.2. History of Food Chemistry

It is a short time since Food Chemistry is accepted as an independent subject. However, the researches and reports related to this subject have been started since the last 1700s. Many components were separated from foods by chemists and botanists at that time and Researches on the Chemistry of Food by Justus von Liebig in 1847 is recognized as the first book related to food chemistry.

As the trading of foods between regions and countries increased, both consumers and manufacturers had urgent needs on the information of water contents and the presence nonfood components in foods. Meanwhile, driven by the rapid development of analysis measures, the desire to understand the natural characteristic of foods also grew. In 1860, German scholars Hanneberg W. and Stohman F. invented a method for the simultaneous determination of water, crude fat, ash, and nitrogen contents. Several years later, diets containing solely proteins, lipids, and carbohydrates were found insufficient for maintaining life.

In 1900s, with the advancement of analytical techniques and the biochemistry subject and the rapid development of the food industry, requirements on new food processing technologies and prolonged storage life emerged, which drove the quick development of food chemistry. During this period, a growing number of researches papers were published and the quantity of related journals increased significantly as well, including Archives of Biochemistry and Biophysics (initiated in 1942), Journal of Agricultural and Food Chemistry (initiated in 1953) and Food Chemistry (initiated in 1966). Due to the emergency of increasing deep and systematic publications, Food Chemistry gradually developed into an independent subject. Chinese scholars Yanbin Xia and Ruijin Yang divide the history of Food Chemistry into four stages.

Stage one: Many natural components were separated from plants and animals and were identified, including lactic acid, citric acid, malic acid, and tartaric acid. The knowledge was not systematic yet and was reported mainly by chemists.

Stage two: In the early 1900s (1820 ~ 1850), food chemistry developed quickly along with the development of agricultural chemistry and gained much importance in Europe. Specialized food chemistry laboratories were established and many professional journals related to food chemistry were issued. Meanwhile, adulteration became a serious issue and the need for impurity determination propelled the development of food chemistry. In this stage, Justus von Liebig invented an optimized method for quantitative analysis of organic substances and published Researches on the Chemistry of Food in 1847.

Stage three: In the middle 1900s century, the British scientist Arthur Hill Hassall reported the microscopic images of pure and adulterated foods and food chemistry came into the microanalysis time. In 1871, Jean Baptis M D.M. proposed that diets containing only proteins, carbohydrates and lipids were insufficient to sustain human‘s life. The interests on the nutritional requirements further accelerated the development of food chemistry. Until the first half of the 20th century, the majority of components in foods were identified and the number of literatures related to chemistry food increased markedly. Food chemistry then turned to be a mature and independent subject in mid-20th century.

Stage four: Food chemistry is now in the fourth stage. With the rapid development of society, economy, science and technology, and the improvement of living standards, consumers raise higher requirements on food security, nutrition, palatability, and convenience. Meanwhile, to realize the transformation from traditional to scaled, standardized, and modernized processing of foods, more and more new technologies, materials, and equipment are used, which markedly drive the rapid development of food chemistry. Besides, the advancement of basic chemistry, biochemistry, instrumental analysis and other related subjects guarantee the rapid development of food chemistry. Food chemistry has become a most important subject for food scientists [1, 2].

1.1.3.

Food Chemistry Textbooks

A series of food chemistry textbooks were published between 1976 to 1985, including Latest Food Chemistry by Hayashi Junzo and Kitamura Mitsuo (Japan), Food Chemistry by Sakurai Yoshito (Japan), Food Chemistry by Owen R. Fennema (United States), and Food Chemistry by Belitz HD (Germany), in which, the works of Fennenma and Belitz HD contributed a lot to the development of food chemistry and has been widely chosen by university students as textbook. Food Chemistry has been chosen as a fundamental course for food related majors.

1.2. The Role of Food Chemistry in Food Science and Engineering

Foodstuff undergoes various chemical and biochemical reactions during storage, transport, and processing. These reactions might yield products that are either beneficial to food nutrition and palatability or harmful to consumers. The knowledge of food chemistry is hence of extreme importance, because the purpose of this subject is to elucidate the changes of various food components occurred during storage, transport, and processing and the effects of these changes on food quality. In recent years, the control of composition, property, structure, and interaction of various food components, the chemical nature of the nutrition and palatability of complex food systems, and the exploitation of new food resources constitute the new contents of food chemistry. With the development of science and technologies and the extension of other fundamental subjects to the food industry, more and more toxic and harmful chemicals in foods are identified and food chemistry has turned to be the theoretical foundation for guaranteeing food quality and safety. Food chemistry plays an important role in food science and engineering and is developing quickly.

1.2.1.

Role of Food Chemistry in Technology Advancement

Nutrition, healthcare, safety, and enjoyment are the four fundamental attributes of foods required by the modern food industry. The theories and application research results of food chemistry are guiding the healthy and sustainable development of the food industry (Table 11). Practice has proved that, no the theoretical guidance of food industry, no the ever growing modern food industry.

Table 1-1. Impact of food chemistry on technological advancement of the food industry [3, 4]

Food Industry Application

Basic food industry

Storage and processing of fruits and vegetables

Flour improving; starch modification; new edible materials exploitation; high-fructose syrup; food enzymes; molecular basis of food nutrition; new sweetener and natural additive development; new oligosaccharide production; oil modification; vegetable protein isolates; functional peptides production; microbial polysaccharides and single cell protein development; development and utilization of wild, marine, an edible drug resources, etc.

Chemical peeling; color protection; texture control; vitamin retention; deastringency and debittering; coating and waxing; chemical preservation; controlled atmosphere storage; bioactive packaging; enzyme-assisted juicing, filtration and clarification; chemical preservation, etc.

Food Industry Application

Storage and processing of meats

Beverage industry

Dairy industry

Baking industry

Edible oils and fats industry

Condiments industry

Fermented food industry

Food safety

Table 1-1. (Continued)

Post-slaughter processing; juice preservation and tenderization; color protection and development; enhancement of the emulsifying capacity, gelling capacity, and viscoelasticity of meat; frozen denaturation of proteins; fresh meat packaging in supermarket; production and application of fumigation agent; artificial meat production; comprehensive utilization of viscera, etc

Instant dissolution; ingredient floating and/or sinking inhibition; protein beverage stabilization; water treatment; juice stabilization; juice color protection; flavor enhancement; alcohol degree decrease; beer clarification; beer foamability and bitterness improvement; chemical nature and prevention of beer non-biological stability; off-flavor elimination; juice deastringency; soybean odor elimination, etc.

Yoghurt and juice milk stabilization; chymosin substitute development; whey utilization; nutrition fortification of diary products; etc.

High-efficiency leavening agent development; crispness improvement; bread color and texture modification; aging and mildewing inhibition; etc.

Lipid refinement; lipid modification; development and utilization of DHA, EPA, and MCT; food emulsifier and anti-oxidant development; oil absorption reduction of fried foods; etc.

Meat soup production; nucleotide-type flavor enhancers; organic iodinesupplemented salt; etc.

Post-processing of fermented foods; flavor changes during postfermentation; comprehensive utilization of biomass and residues; etc.

Source identification of exogenous toxicants and their prevention; identification of endogenous toxicants and their elimination; etc

Food inspection Formulation of inspection standards; rapid analysis; biosensor development; fingerprint preparation of products; etc.

Due to the rapid development of food chemistry, some important reactions, including the Millard reaction, caramelization, lipid auto-oxidation, starch gelatinization and aging, polysaccharide hydrolysis and modification, protein hydrolysis and denaturation, pigment discoloration, vitamin degradation, metal-catalyzed reactions, enzyme-catalyzed reactions, fat hydrolysis and transesterification, lipid thermo-oxidative decomposition and polymerization, flavor compound changes, action mechanisms of food additives, generation of harmful ingredients as well as postharvest physiology, are identified in foods. The knowledge on these reactions greatly enhances the development of the food industry

1.2.2.

Role of Food Chemistry in Human Nutrition and Health

It has been more than two centuries since proteins, carbohydrates and lipids were identified as the three major nutrients for human The two most important attributes of foods are to provide consumers with nutrition and sensory satisfaction. One of the objectives of food chemistry is to investigate the nutrition and flavor composition in food materials and processed foods and the interactions of the components occurred during processing and storage and effects of these interactions on food nutrition and palatability The modern food

chemistry should not only ensure the healthcare and enjoyment attributes of food components, but also guide consumers on rational diet selection. The concept of nutrition has evolved significantly due to social development and the change of the healthy status of consumers. How to reduce the incidences of diet-related diseases, such as cardiocerebrovascular diseases, cancers, and diabetes, has turned to be a new major task of food industry In addition to the healthcare attribute, foods should also provide desirable flavors so that consumers enjoy the eating process. The emergence of biotechnologies and new food processing technologies guarantees the safety of foods.

Contamination of foods by pollutants is currently a worldwide concern due to global environmental deterioration. The analysis and identification of trace and ultramicro substances are of vital importance to the nutrition value and the control of toxicants of foods. The development of food chemistry has been associated with the healthy status and civilization level of human.

1.3. Research Methods of Food Chemistry

Each type of food contains a large number of components and is thereby a much complex system. Hence, the research methods of food chemistry are quite different from those of common chemistry subjects. In food chemistry, the knowledge on the chemical composition, physicochemical properties, and changes of food components must be associated with the nutrition, enjoyment, and safety of foods. The experimental design of food chemistry should reveal the complex composition of food systems and the changes of the nutrition value, enjoyment, and safety of foods during processing and storage. The interactions between food components and their changes occurred during storage and processing (such as ultra-high pressure, high temperature, freezing, presence or absence of oxygen) are extremely complex. Hence, many researches are carried out in simplified and stimulated models, which must be then verified in real food systems.

The experiments of food chemistry include mainly physicochemical experiments and sensory evaluation experiments. Physicochemical experiments reveal the composition of foods and the structures of the components, including nutrients, toxicants, and flavors; while sensory experiments evaluate the texture, flavor, and color changes of foods through visual inspection.

Foods or food materials undergo a series of changes during storage, transport, processing, and sales. The changes include: enzymatic and chemical reactions in raw and fresh materials; changes caused by water activity variance; component decomposition, polymerization, and denaturation under violent conditions (high temperature, high pressure, mechanical actions); oxidation induced by oxygen or other oxidants; photochemical reactions; and migration of packaging materials to foods. Of the changes, non-enzymatic browning, lipid oxidation and hydrolysis, protein hydrolysis and denaturation, protein cross-linking, oligosaccharide and polysaccharide hydrolysis, and change of the presence form of natural pigments and their degradation, are the most important reactions for the food industry. Of the reactions, some are desired, but some are unexpected and must be avoided during processing (Table 1-2). The mechanisms and control of these reactions constitute the key contents of food chemistry.

Table 1-2. Part reactions occurred during food processing and storage and their influences on foods [3, 4]

Reaction Examples

Nonenzymic browning Color development in bakery foods

Oxidation Oxidation of lipids, vitamins, an phenols

Hydrolysis Hydrolysis of lipids, proteins, and carbohydrates

Isomerization cis-trans isomerization of lipids

Polymerization Foam and insoluble brown precipitate forming in frying

Protein denaturation Egg white coagulation; enzyme inactivation

Influence on foods

Desired or undesired color, smell, taste; loss of nutrition; harmful ingredients.

Change color; desired flavor or off-odors and toxicants

Increased soluble solids content; texture changes; desired color, flavor, taste, and nutrition; toxicity loss of certain components

Discoloration; formation or loss of certain functions

Discoloration; loss of nutrition; off-odor development; toxicants formation

Improved nutrition; toxicity loss of certain components

The research fruits and methods of food chemistry have been widely absorbed by the food industry and greatly promote the development of the food industry. In the last decades, some new subjects and research areas, such as structural chemistry, free radical chemistry, membrane separation, edible package, microencapsulation, extrusion, superfine comminution, bioactive packaging, supercritical extraction, molecular distillation, membrane catalysis, bioreactor, toxicant chemistry of foods, molecular nutrition, and nutria-genomics, have been established. These new technologies and subjects will undoubtedly facilitate the rapid development of the food industry, which in turn benefits the improvement of the food chemistry subject.

REFERENCES

[1] Wang, DF. Food Chemistry.1st edition. Beijing: Chemistry Industry Press; 2007

[2] Damodaran, S; Parkin, KL; Fennema, OR. Fennema’s Food Chemistry. 4th edition. New York: CRC Press; 2007.

[3] Kan, JQ. Food Chemistry. 1st edition. Beijing: China Agricultural University Press; 2002.

[4] Wang, Z Food Chemistry. 1st edition. Beijing: China Light Industry Press; 2005

In: Food Chemistry ISBN: 978-1-61942-125-7

Editors: D.Wang, H. Lin, J. Kan et al. © 2012 Nova Science Publishers, Inc. Chapter 2

WATER

Jianqian Kan1 and Guoqing Huang2

1College of Food Science, Southwest University, Chongqing, China

2College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, China

ABSTRACT

Water is an important component in many foods. Its content and occurrence status significantly affect the flavor, texture, and stability of foods. This chapter deals with the various physical and chemical properties of water and ice and the interactions with other components in foods. Water occurs in multiple states due to interactions with solutes and the interactions significantly affect the bioavailability of water to chemical reactions and microorganisms

To distinguish the differences between water content and its bioavailability, the term water activity (aw) is proposed and its application in food stability predication are detailed. The relationship between water content and aw can be presented by moisture sorption isotherm (MSI), which is very useful in designing the concentration and dehydration processes of foods.

In addition to aw, molecular mobility (Mm) has also been proposed to predict food stability Its definition and its effect on food stability are also a concern of this chapter. Water is a predominant constituent in many foods (Table 1). Water in proper amount, location, and orientation profoundly influences the structure, appearance, and taste of foods and their susceptibility to spoilage.

Because medium water supports chemical reactions and water is a reactant in hydrolytic processes, the removal of water from foods retards many reactions and inhibits the growth of microorganisms, thus improving the shelf lives of a number of foods. Through physical interaction with proteins, polysaccharides, lipids and salts, water contributes significantly to food texture

Water is essential to life: as an important governor of body temperature, as a solvent, as a carrier of nutrients and waste products, as a reactant and reaction medium, as a lubricant and plasticizer, as a stabilizer of biopolymer conformation, as a likely facilitator of the dynamic behavior of macromolecules, including their catalytic (enzymatic) properties, and in other ways yet unknown.

Table 1. Water contents of some foods [1]

Food

Pork, raw, composite of lean

Beef, raw, retail cuts

Chicken, all classes, raw meat without skin

Fish, muscle proteins 65~81

Avocado, bananas, peas (green)

Beets, broccoli, carrots, potatoes 80~85

Asparagus, beans (green), cabbage, cauliflower, lettuce

Berries, cherries, pears

Apples, peaches, oranges, grapefruit

Rhubarb, strawberries, tomatos

margarine

1.PHYSICAL AND CHEMICAL PROPERTIES OF WATER AND ICE

1.1. The Water Molecule and Its Association

1.1.1. The Water Molecule

The water molecule is comprised of two hydrogen atoms interacting with the two sp 3 bonding orbitals of oxygen, forming two covalent σ bonds. A schematic orbital model of a water molecule is shown in Figure 1.a and the appropriate van der Waals radii are shown in Figure 1.b.

Figure 1. Schematic model of a single HOH molecule: (a) sp 3 configuration, and (b) van der Waals radii for a HOH molecule in the vapor

In the vapor state, the bond angle of an isolated water molecule is 104.5°. The O-H internuclear distance is 0.96 Å and the van der Waals radii for oxygen and hydrogen are 1.40 and 1.2 Å respectively.

1.1.2. Association of Water Molecules

Each water molecule has an equal number of hydrogen-bond donors and receptor sites and is able to hydrogen-bond with a maximum of four water molecules. The resulting tetrahedral arrangement is shown in Figure 2. The two unshared electron pairs (n-electrons or sp 3 orbitals) of oxygen act as H-bond acceptor sites and the H-O bonding orbitals act as hydrogen bond donor site. The dissociation energy of this hydrogen bond is about 1125kJ/mol.

As mentioned above, each water molecule can hydrogen bond with at most four water molecules and the resultant three-dimensional structure is quite stable. This structure is quite different from those formed by other small molecules that also involved in hydrogen bonding (such as NH3 and HF). Ammonia has three hydrogen-bond donors and one hydrogen-bond receptor, while HF has one hydrogen and three receptor sites Both the two chemicals do not have equal numbers of donor and receptor sites and therefore can form only two dimensional hydrogen-bonded networks. The above mentioned polarization of H-O bonds is transferred via hydrogen bonds and extends over several bonds. Therefore, the dipole moment of a complex consisting of increasing numbers of water molecules is higher as more molecules become associated and is certainly much higher than the dipole moment of a single molecule. Proton transport takes place along the H-bridges. It is actually the jump of a proton from one water molecule to a neighboring water molecule. In this way a hydrate H3O+ ion is formed with an exceptionally strong hydrogen bond (dissociation energy about 100kJ/mol). A similar mechanism is valid in transport of OH- ions, which also occurs along hydrogen bridges (Figure 3)

Figure 2 Hydrogen bonding in a tetrahedral configuration. Open circles are oxygen atoms and closed circles are hydrogen . Hydrogen bonds are represented by dashed lines [1].

Figure 3. Proton transport in water [2]

Table 2. Coordination number and distance between two water molecules [2]

Table 3. Comparisons of the melting and boiling points of methanol, dimethyl ether, and water

1.2. Structures of Water and Ice

1.2.1.

The Structure of Water (Liquid)

Due to the strong tendency of water molecules to associate through H-bridges, liquid water is highly structured as ice, but not sufficiently established to produce long-range rigidity. The major difference between liquid water and ice lies in the coordination number and the distance between neighboring water molecules (Table 4).

The degree of intermolecular hydrogen bonding among water molecules is temperature dependent. Ice at 0°C has a coordination number of 4.0, with nearest neighbors at a distance of 2.76 Å. As the temperature increases, the coordination number increases from 4.0 in ice at 0°C, to 4.4 in water at 1.50°C, then to 4.9 at 83°C. Simultaneously, the distance between nearest neighbors increases from 2.76 Å in ice at 0°C, to 2.9 Å in water at 1.5°C, then to 3.05 Å at 83°C.

The increase in the distance between nearest neighbors during ice-water transformation decreases the water density, while the increase in the coordination number increases water density The maximum water density is observed in 3.98°C and then declines gradually. The hydrogen-bound water structure can be changed in the presence of dissolved salts or molecules with polar and/or hydrophobic groups. For example, in salt solutions the nelectrons occupy the free orbitals of the cations, forming ―aqua complexes‖.

Other water molecules then coordinate through H-bridges, forming a hydration shell around the cation and disrupting the natural structure of water. In addition, hydration shells are also formed by polar groups through dipole-dipole interaction or H-bridges, again leading to the disruption of the structure of water. The three-dimensional hydrogen-bound structures of ice and water impart them with unique properties and extra energy is needed for disrupting the structures. Table 3. lists the comparisons of the melting and boiling points between methanol, dimethyl ether, and water.

Figure 4. Unit cell of ordinary ice at 0°C. Circles represent oxygen atoms of water molecules. Nearestneighbor internuclear O 3].

1.2.2. The Structure of Ice

Ice is the orderly organized crystal of w molecules. The O-O internuclear distance between nearest neighbor in ice is 2.76 Å and the O-O-O bond angle is about 109°, which is very close to the perfect tetrahedral angle of 109°28'. As shown in Figure 4, each water molecule is associated with four other water molecules 1, 2, 3, and W'. Because pure water contains H3O+, OH–, and negligible isotope variants (such as those containing 16O, 1H, 17O, 18O, and 2H) in addition to ordinary water molecules, actual ice is not present as the perfect crystal shown in Figure 4.

Due to the presence of H3O+, OH– and their dislocation, ice crystals suffer both orientational and ionic defects. Only at temperatures near -180°C or lower will all hydrogen bonds be intact, and as the temperature is raised, the mean number of intact (fixed) hydrogen bonds will decrease gradually.

The amount and kind of solutes present in foods influence the quantity, size, structure, location, and orientation of ice crystals. The four major ice structures are hexagonal forms, irregular dendrites, coarse spherulites, and evanescent spherulites. The hexogonal form, which is most highly ordered, is found exclusively in foods, provided extremely rapid freezing is avoided and the solute is of a type and concentration that does not interfere unduly with the mobility of water molecules

2.STATES OF WATER IN FOODS

2.1. Water-Solute Interactions

Mixing of solutes and water results in altered properties of both water and solutes. Hydrophilic solutes change the structure and mobility of adjacent water, and water causes changes in the reactivity, and sometimes structure, of hydrophilic solutes. Hydrophobic groups of added solutes interact only weakly with adjacent water. Interactions between water and specific classes of solutes are considered below.

2.1.1. Interaction of Water with Ions and Ionic Groups

Ions and ionic groups of organic molecules hinder the mobility of water molecules to a greater degree than do any other types of solutes. The strength of electrostatic water-ion bonds is greater than that of water-water hydrogen bonds, but is much less than that of covalent bonds.

The normal structure of pure water (based on a hydrogen-bonded, tetrahedral arrangement) is disrupted by the addition of dissociable solutes. Water and simple inorganic ions undergo dipole-ion interactions. The example in Figure 5. involves hydration of the NaCl ion pair.

In a dilute solution of ions in water, second-layer water is believed to exist in a structurally perturbed state because of conflicting structural influences of first-layer water and the more distant, tetrahedrally oriented ―bulk-phase‖ water. In concentrated salt solutions, water structure would be dominated by the ions.

The ability of a given ion to alter net structure is related closely to its polarizing power (charge divided by radius) or simply the strength of its electric field. Ions that are small and/or multivalent (mostly positive ions, such as Li+, Na+, H3O+, Ca2+, Ba2+, Mg2+, Al3+, F–, and OH–) have strong electric fields and are net structure formers.

These ions strongly interact with the four to six first-layer water molecules, causing them to be less mobile and pack more densely than HOH molecules in pure water. Ions that are large and monovalent (most of the negatively charged ions and large positive ions, such as K+, Rb+, Cs+, Cl–, Br–, I–, NO3 – , BrO3 –, IO3 – and CIO4 – have rather weak electric fields and are net structure breakers, although the effect is very slight with K+. These ions disrupt the normal structure of water and fail to impose a compensating amount of new structure.

Ions, through their varying abilities to hydrate (compete for water), alter water structure, influence the permittivity of the aqueous medium, and govern the thickness of the electric double layer around colloids, profoundly influence the ―degree of hospitality‖ extended to other nonaqueous solutes and to substances suspended in the medium. Thus, conformation of proteins and stability of colloids (salting-in, salting-out in accord with the Hofmeister or lyotropic series) are greatly influenced by the kinds and amounts of ions present.

Figure adjacent to sodium chloride. Only water molecules in plane of paper are shown [

2.1.2. Interaction between Water and Neutral Groups Possessing Hydrogen-Bonding Capabilities

Interactions between water and nonionic, hydrophilic solutes are weaker than water-ion interactions and about the same strength as those of water-water hydrogen bonds. Therefore, solutes capable of hydrogen bonding might be expected to enhance or at least not disrupt the normal structure of pure water. However, in some instances it is found that the distribution and orientation of the solute's hydrogen-bonding sites are geometrically incompatible with those existing in normal water. Thus, these kinds of solutes, such as urea, frequently have a disruptive influence on the normal structure of water. It should be noted that the total number of hydrogen bonds per mole of water may not be significantly altered by addition of a hydrogen-bonding solute that disrupts the normal structure of water. This is possible since disrupted water-water hydrogen bonds may be replaced by water-solute hydrogen bonds. Hydrogen bonding of water can occur with various potentially eligible groups (e.g., hydroxy1, amino, carbony1, amide, imino groups, etc.). This sometimes results in ―water bridges‖, where one water molecule interacts with two eligible hydrogen-bonding sites on one or more solutes. A schematic depiction of water hydrogen bonding (dashed lines) to two kinds of functional groups found in proteins is shown in Figure 8. A more elaborate example involving a three-HOH bridge between backbone peptide units in papain is shown in Figure 9.

Figure 8. Hydrogen bonding (dotted lines) of water to two kinds of functional groups occurring in proteins [3]
F bridge in papain; 23, 24, and 25 are water molecules [4]

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owne experience.” But the “governour” and the “juste publike weale” receive no consistent discussion.

The opening chapters, postulating order, proceed thence to honour (i.e., rank), and so to one sovereign. Their review of history is very slight; and from Chapter iv Book I is occupied rather with the education of a gentleman. Book II is composed mainly of exempla to illustrate the virtues appropriate to high position; and Book III adds little more than further classified aggregation.

With no further design, without even a distinct idea, The Governour has of course no logical progress. Lawyer and something of a diplomat, Elyot was not a thinker. Reading widely without discrimination, and sometimes apparently at second hand, he compiled under headings. His later Bankette of Sapience (second edition? 1542) is a collection of sententiae arranged alphabetically under abstinence, adversity, affection, ambition, authoritie, amitie, apparaile, almsdeede, accusation, arrogance, etc. His Governour, though its headings have more logic, is hardly consecutive. In sources as in topics the book is a miscellany.

I. vii, viii, for instance, on a gentlemanly, not a professional knowledge of music, painting, and sculpture, suggest the Cortegiano; xii inquires “why gentilmen in this present time be not equal in doctryne to the auncient noblemen”; xiv proposes exempla for law students After finding England deficient in the fine arts (140), he returns to law students with a recommendation of rhetoric, and thereupon itemizes it (149) under status, inventio, etc By the end of the book he has passed from prudence to chess, archery, tennis, and bowls

Elyot’s diction, though he wishes to “augment our Englysshe tongue,” is Latinized sparingly Copie in the sense of the Latin copia, was fairly common in his time. He adds, e.g., allecte and allectyve, coarted, fatigate, fucate, illecebrous, infuded, propise, and provecte. His generally unpretentious habit is sometimes concretely racy.

Jean Bodin’s treatise on historical method (Methodus ad facilem historiarum cognitionem, 1566),[86] giving high praise to Guicciardini,

differs from him in conception. For Bodin, history is less a progress in time than a thesaurus of exempla.

Dividing it into human, natural, and divine, he would have us begin with a chronological reference table (ii), proceed to a more detailed survey, such as Funck’s or Melanchthon’s, advance to the histories of particular nations, Jews, Greeks, Romans, and then to such smaller communities as Rhodes, Venice, and Sicily, with constant attention to geography.

In iii, De locis historiarum recte instituendis, the topics are first the commonplaces of encomium: birth, endowments, achievements, morals, culture. From the family, which for Bodin is the starting point of history, we are to proceed to the organization of the state and the developments of the arts.

De historicorum delectu (iv) has many specific and acute estimates of both ancients and moderns “Somehow those who are active in wars and affairs (44) shy at writing; and those who have given themselves somewhat more to literature are so possessed with its charms and sweetness as hardly to think in other terms ” Bodin himself is broad enough to praise both Plutarch and Tacitus.

De recto historiarum iudicio (v), beginning with geography, proceeds to regional traits The approach is suggestive; but the development is little more than aggregation under those dubious headings Northern and Southern, Eastern and Western

At this point (vi) Bodin begins the analysis of the state: the elemental family, the citizen, the magistrate, the king. “Macchiavelli, indeed, the first after some twelve hundred years since the barbarians to write on the state, has won general currency; but there is no doubt that he would have written several things more truly and better if he had added legal tradition (usus) to his knowledge of ancient philosophers and historians” (140). Monarchy is found to be the ideal form of government. The golden age of primitive peace and happiness is proved to be a senile fancy (vii) Let us rather, relying on the science of numbers, De temporis universi ratione (viii), compute the recurrence of historical “cycles ” Strange conclusion to so much hard reasoning!

Systematically analytical, the book is easier to consult than to follow; but its Latin style is of that sincere, capable, unpretentious sort which had been established for history by the Italians. The political ideas of the Methodus are carried out by the same

systematic analysis in Bodin’s second book, Les Six Livres de la république, 1576.[87] Greek and Latin political usage is made by a long wall of citations to support, with other proofs from history, the theory of absolute monarchy.

Such support of the new monarchies by a reasoned theory based on ancient history did not pass unchallenged. George Buchanan, with more literary competence in Latin, though with less knowledge of politics, offered for his little Scotland a theory of monarchy answerable to the people (De jure regni apud Scotos dialogus, 1579).[88] The preface, addressed to James VI, keeps a tutorial tone, as of one still laying down the law. The occasion put forth for the Ciceronian dialogue is French reprobation of Scotch politics. How shall this be met? The method is evident from the first three points.

To distinguish a king from a tyrant, we must remember that society is founded not only on utility, but on natural law implanted by God A king is typically shepherd, leader, governor, physician, created not for his own ends, but for the welfare of his people (1-6)

Kingship, being an ars based on prudentia, needs guidance by laws (8). Objection: who would be king on these terms? Answer: ancient history and doctrine show motives higher than lust for power and wealth (9).

These two points being iterated in summary for transition, the third is the need not only of laws, but of a council (11-14).

The many exempla from ancient and modern history confirming or challenging the a priori progress of the dialogue do not touch the recent events that raised the question. Scotch history is used even less specifically than ancient to confirm the theory of limited monarchy. But though Buchanan does not prove that recent politics were an application of his theory, he makes the theory itself interesting and sometimes persuasive.

The Latin style has more liveliness, expertness, and range than Bodin’s. But the argument, though urgent as well as scholastically ingenious, remains unconvincing. After debating general considerations inconclusively, it falls back at last on the particular customs and needs of Scotland. These are not applied specifically

enough to be determining. The expertness of the dialogue is rather literary than argumentative.

Brought down to the market place by printing, controversy by the end of the century was learning the ways of journalism in pamphlets. Meantime printing had opened such compilation as Elyot’s, samples of learning for those eager readers who had not gone to school with the Latin manuals of Erasmus.

The best of these sixteenth-century discussions, the piercing urgency of Macchiavelli, the charming exposition of Castiglione, the philosophical survey of More, the systematic analysis of Bodin, the hot attack of Buchanan, are all essays in that modern sense of the word which applies it to consecutive exposition involving argument. They show essay-writing of this kind—which was to move more surely in the seventeenth century—already on a firm footing. They recognize the Italian tradition of history in abjuring the decorative dilation which was habitual in other fields. They show Latin and vernacular side by side, and vernacular prose gaining point and finish from the Latin commanded by all their writers. They are a solid literary achievement of the Renaissance.

2. MONTAIGNE

The other kind of essay, the literary form that has kept the original meaning of attempt, sketch, experiment, had its pace set late in the sixteenth century by Montaigne. Nothing could be farther removed than his habit from tidy system or consecutive argument. Devoted to the reading of history, and eager to share its profits, he had no mind to follow the Italian tradition of writing history. Essai in his practice is not the settling of a subject, but the trying. He makes one approach, then another, suggesting relations that he does not carry out. With many exempla he invites us to accumulate philosophy of living. If we do not coöperate, if we do not think them over, his essays remain collections of items in memorable phrase, without compelling sequence of ideas. For Montaigne is not the kind of philosopher who integrates a system; he is a sage. He has the sage’s oral habit. No writing conveys more the impression of thinking aloud. Again and

again he writes as if making up his mind, not before utterance, but by the very process of utterance. Macchiavelli, or Bodin, having made up his mind fully and finally, tries to convince us; Montaigne, as if making up his in our company, throws out suggestions.

True, some few of his essays are more consecutive developments of what he has concluded. His early and widely quoted Education of Children (II. xxvi) has even some logical progress.

But logical sequence is not Montaigne’s habit. His many revisions[89] show him leaning more and more on the aggregation of separate suggestions. He changes words, he adds instances, but he does not seek a stricter order.

But I am going off a little to the left of my theme.... I, who take more pains with the weight and usefulness of my discourses than with their order and sequence, need not fear to lodge here, a little off the track, a fine story (II xxvii)

This bundling of so many various pieces is made on condition that I put hand to it only when urged by too lax a leisure, and only when I am at home (II. xxxvii, opening).

His usual lack of sequence, then, is not careless. The careless fumbling that comes from muddled thinking he ridicules.

They themselves do not yet know what they mean, and you see them stammer in bringing it forth, and judge that their labor is not in childbirth, but in conception, and that they are only licking what is not yet formed (I. xxvi)

As to sequence he even catechizes himself.

Is it not making bricks without straw, or very like, to build books without science and without art? The fantasies of music are conducted by art, mine by chance

And his answer is very earnest.

At least I have this from my course of study (discipline), that never a man treated a subject that he understood and knew better than I do the one that I have undertaken, and that in this subject I am the most learned man alive; secondly, that no one ever penetrated farther into its material, nor peeled more sedulously its parts and their consequences, nor reached more precisely and fully the end that he had proposed for his job To accomplish this, I need bring no more than fidelity That I have, the most sincere and pure that is to be found (III ii)

Montaigne’s method, then, is deliberate.[90] If he passes, as in Des coches (III. vi), from examples of lavish display to the cruelty of Spanish conquest in Mexico and frankly begins his last paragraph with retumbons à nos coches, that is because he usually prefers to take us on a journey around his idea. Hundreds of readers have found the talk of such a guide on the way more winsome than the conclusions of others after they have come home.

The art of growing an idea by successive additions sets the pace also for his sentences. Knowing Latin, he tells us, as a native language, and better than French, he puts aside Cicero for Seneca. This is more than the rejection of Ciceronianism, more than preference for Seneca’s philosophy; it is in detail the same aggregative method that he uses for the composition of a whole essay. That vernacular sentences were commonly more aggregative than those of Augustan Latin may have been a reason for his choosing the vernacular. At any rate, he keeps the two languages quite apart. Instead of applying his Latin to the pointing of his French sentences, he prefers to let them accumulate as in talk.

(1) They do still worse who keep the revelation of some intention of hatred toward their neighbor for their last will,

(2) having hid it during their lives,

(3) and show that they care little for their own honor,

(4) irritating the offense by bringing it to mind,

(5) instead of bringing it to conscience,

(6) not knowing how, even in view of death, to let their grudge die,

(7) and extending its life beyond their own. (I. vii.)

The sentence might easily have been recast in a Latin period; Montaigne prefers to let it reach its climax by accumulation.

(1) Nature has furnished us, as with feet for walking, so with foresight to guide our lives,

(2) foresight not so ingenious, robust, and pretentious as the sort that explores (invention),

(3) but as things come, easy, quiet, and healthful, (4) and doing very well what other people say, (5) in those who have the knack of using it simply and regularly, (6) that is to say, naturally (III xiii )

So his epigrams are comparatively few and simple. His many memorable sayings are not paraded as sententiae

It is not a soul, not a body, that we are educating; it is a man (I. xxvi).

Unable to regulate events, I regulate myself, and adjust myself to them if they do not adjust themselves to me (II. xvii).

The teaching that could not reach their souls has stayed on their lips (III. iii).

Between ourselves, two things have always seemed to me in singular accord, supercelestial opinions and subterranean morals (III xiii)

For Montaigne’s shrewd summaries prevail less often by balanced sentences than by concrete diction.

I am seldom seized by these violent passions My sensibility is naturally dense; and I encrust and thicken it daily by discourse (I ii)

Anybody’s job is worth sounding; a cowherd’s, a mason’s, a passerby’s, all should be turned to use, and each lend its wares; for everything comes handy in the kitchen (I. xxvi).

Such sentences, such diction, are not only his practice; they are part of his literary theory.

The speech that I like is simple and direct, the same on paper as on the lips, speech succulent and prompt (nerveux), curt and compact, not so much delicate and smoothed as vehement and brusque Haec demum sapiet dictio quae feriet rather tough than tiresome, shunning affectation, irregular, loose, and bold, each bit for itself, not pedantic, not scholastic, not legal, but rather soldierly (I xxvi)

The urgent metrical sentence of poetry seems to me to soar far more suddenly and strike with a sharper shock [The figure is of a falcon] (I. xxvi).

These good people (Vergil and Lucretius) had no need of keen and subtle antitheses Their diction is all full, and big with a natural and constant force. They are all epigram, not only the tail, but the head, the stomach, and the feet.... It is an eloquence not merely soft and faultless; it is prompt and firm, not so much pleasing as filling and quickening the strongest minds. When I see those brave forms of expression, so vivid, so deep, I do not call it good speaking; I call it good thinking (III. v).[91]

So he cannot stomach that Renaissance imitation which ran to borrowing, nor that display of Latin style for itself which published even private letters.

Those indiscreet writers of our century who go sowing in their worthless works whole passages from the ancients to honor themselves (I xxvi)

But it surpasses all baseness of heart in persons of their rank that they have sought to derive a principal part of their fame from chatter and gossip, even to using the private letters written to their friends (I. xl).

So he is impatient with the unreality of romance.

Going to war only after having announced it, and often after having assigned the hour and place of battle (I. v).

Those Lancelots, Amadis, Huons, and such clutter of books to amuse children (I. xxvi).

Reviewing contemporary criticism of poetry, he says: “We have more poets than judges and interpreters of poetry; it is easier to make it than to know it” (I. xxxvii). “You may make a fool of yourself

anywhere else,” he warns, “but not in poetry” (II. xvii). So there is no room for mediocre poetry.

Popular, purely natural poetry has simplicities and graces comparable with the eminent beauty of poetry artistically perfect, as is evident in the Gascon villanelles and in songs brought to us from illiterate peoples. Mediocre poetry, which is neither the one nor the other, is disdained, without honor or even esteem (I. liv).

Dismissing in a scornful phrase “the Spanish and Petrarchist fanciful elevations” (II. x), he exactly estimates the Latin poets of his time as “good artisans in that craft” (II. xvii). Perhaps a certain significance, therefore, attaches to his repeating the current complacency with regard to French poetry.

I think it has been raised to the highest degree it will ever attain; and in those directions in which Ronsard and Du Bellay excel I find them hardly below the ancient perfection (II. xvii).

Elsewhere, and habitually, Montaigne’s attitude toward the classics was quite different from the habit of the Renaissance. He sought not so much the Augustans as Seneca and the Plutarch of Amyot.

Je n’ay dressé commerce avec aucun livre solide sinon Plutarque et Seneque, où je puyse comme les Danaides, remplissant et versant sans cesse (I xxvi)

These, and even Cicero and Vergil, he sought not for style, but for philosophy and morals. That sounder classicism of composition which, through the Italian tradition of history, had animated Renaissance essayists of the stricter sort he put aside. He was not interested in the ancient rhetoric of composition, nor, to judge from his slight attention to it, in that field of ancient poetic. He quotes both Dante and Tasso, but not in that aspect. He is not interested in the growing appreciation of Aristotle’s Poetic. In this disregard of composition, indeed, he was of the Renaissance; but he rejected and even repudiated Renaissance pursuit of classicism in style. There he adopted the sound doctrine of Quintilian and scornfully, to

use his own word, abjured borrowed plumes and decorative dilation. If we use the word classical in its typical Renaissance connotation, we must call Montaigne, as well as Rabelais, anti-classical. Unlike as they are otherwise, they agree in satirizing Renaissance classicism.

The positive aspect of this rejection is Montaigne’s homely concreteness. Trying to teach his readers, not to dazzle them, he is very carefully specific. To leave no doubt of his meaning, he will have it not merely accepted, but felt. Therefore he is more than specific; he is concrete. Imagery for him is not mythology; it is of native vintage.

“In this last scene between death and us there is no more pretending. We have to speak French; we have to show how much that is good and clean is left at the bottom of the pot” (I. xix). Such expression strikes us not as wit, not as an aristocrat’s catering to the new public, but as the sincere use of sensory terms to animate ideas. If it reminds us sometimes of popular preaching, that is because Montaigne was a sage.

FOOTNOTES

[1] In H. Chamard, Les Origines de la poésie française de la Renaissance (Paris, 1920), p. 256.

[2] Bembo, Prose, II xxi (Venice, 1525)

[3] Allen, Age of Erasmus, p. 121.

[4] É Egger, L’Hellénisme en France (Paris, 1869), pp 358359; see Monnier, II, 134 for modern estimate of Renaissance Greek texts.

[5] Prose, I, vi (1525).

[6] Egger, p 398

[7] Ibid., p. 205.

[8] Edition of Osgood, pp. 119, 193.

[9] Probably the source of Rabelais’s Abbey of Thelème. He had read the book.

[10] Page references to 1596 edition.

[11] Edited by Louis Humbert, Paris, 1914.

[12] Sir John Cheke, however, spoke as a scholar when he wrote to Hoby: “I am of opinion that our own tung shold be written cleane and pure, vnmixt and vnmangeled with borrowing of other tunges.” Quoted in Arber’s Introduction to Ascham’s Scholemaster, p. 5.

[13] Parodied by Orationes obscurorum virorum (before 1515), which was part of the Reuchlin-Pfefferkorn controversy

[14] This is the exercise called by the ancients declamatio. See ARP (Ancient Rhetoric and Poetic) and a letter of Erasmus, May 1, 1506.

[15] Bartholomaei Riccii De imitatione libri tres (Venice, 1545), folio 38 verso. See below, Chapter III, Sect. 3.

[16] MRP (Medieval Rhetoric and Poetic) I and II.

[17] Ep. 221 in Migne’s Patrologia latina (Vol. 199, p. 247), which dates it 1167; Ep. 223, p. 389, in the collection of the letters

of Gerbert, John of Salisbury, and Stephen of Tournay printed by Ruette (Paris, 1611). The letter is translated MRP 209.

[18] Apologia dei dialoghi, opening; p. 516 of the Venice, 1596, edition.

[19] For De oratore, see ARP

[20] Minturno, Arte poetica, is mere catechism. Perionius hardly achieves dialogue at all; his interlocutors merely interrupt.

[21] Analecta hymnica

[22] For the pattern of the classical rhetoric, see ARP.

[23] MRP

[24] Paul Spaak, Jean Lemaire (Paris, 1926).

[25] Pierre Villey, Les Grands Écrivains du xviᵉ siècle, I, 83-97, 110-148

[26] Evvres de Louize Labé, Lionnoize, revues et corrigées par la dite dame, à Lion, par Jean de Tournes, MDLVI (dedicatory epistle dated 1555).

[27] Each stanza of the Epithalamion ends with a longer line (6 beats), which is the common refrain The other lines have generally five beats, but the sixth and eleventh have only three; and this variation is occasionally extended. Generally there is a rhyme-shift after the eleventh line, but not a break (11 lines on 5 rhymes [or 4] plus 7 lines on 3 rhymes [or 4]). A few stanzas are lengthened to nineteen lines (11 plus 8). Thus the typical variations in this triumph of metrical interweaving are as follows, the underlined letters indicating the lines of three beats: Stanza

& VIII

(19 lines)

[28] Œuvres complètes de P de Ronsard, ed par Paul Laumonier (Paris, 1914-1919), I, 316

[29] London, Wynkyn de Worde, 1515.

[30] For Petrarch and Boccaccio, see Carrara, La poesia pastorale, pp 88-111

[31] Edited by M. Scherillo (Torino, 1888).

[32] Written 1573; published 1580; edited by Angelo Solerti (Torino, 1901).

[33] Le Premier Livre d’Amadis de Gaule, publié sur l’édition originale par Hugues Vaganay (Paris, 1918), 2 vols.

[34] For Alamanni, see Henri Hauvette, Un Exilé florentin Luigi Alamanni (Paris, 1903)

[35] Edited by G. B. Weston (Bari, 2 vols.).

[36] So I iii 31, 51; v 13, 56; vi 54; ix 36; xi 46; and throughout the poem

[37] I. xxii is fabliau; and so, in various degrees, the stories inserted at I. vi. 22, xiii. 29, xxix. 3; II. i. 22, xiii. 9, xxvi. 22; III. ii. 47.

[38] E Donadone, Torquato Tasso (Venice, 1928)

[39] The stanzas are adapted by Spenser, FQ, Book II. xii. 7475.

[40] Diocletian-giants-Brutus-Hogh-Gormet-Hercules, II x 7; Tristan-nymphs-Latona’s son, VI. ii. 25.

[41] Chapter VII.

[42] For Seneca, see ARP

[43] Opera, II, 2.

[44] “Acta fuit Burdegalae Anno MDXLIII” in the colophon can hardly mean merely that the play was finished in that year.

[45] On tragicomedy, see H. C. Lancaster, The French Tragicomedy, Its Origins and Development from 1552 to 1628 (Baltimore, 1907)

[46] For Garnier in England, see A. M. Witherspoon, The Influence of Robert Garnier on Elizabethan Drama (New Haven, 1924).

[47] For Plautus and Terence, see ARP

[48] “Politian was in 1471, at the request of Cardinal Francesco Gonzaga, despatched to Mantua by Lorenzo de’ Medici to prepare an entertainment for the reception of Duke Galeazzo Maria Sforza. The Orfeo, a lyric pastoral in dramatic form, prophetic of so much that was later to come, was the contribution of the brilliant humanist and poet to the Duke’s entertainment. It stands close to the fountainhead of European secular drama ” H

M. Ayres, preface to his translation of the Orfeo in Romanic Review, XX (January, 1929), 1.

[49] See Chapter IV.

[50] Alfred Mortier, Un Dramaturge populaire ... Ruzzante. Œuvres compl traduites pour la première fois (Paris, 1926)

[51] ARP and MRP.

[52] For Aristotle’s Poetic, see ARP.

[53] For discussion of the romances, see Chapter V. For Giraldi’s novelle, see Chapter VIII, 1, c.

[54] ARP

[55] For Hermogenes, see MRP, pp. 23 ff.

[56] References are to the second edition of 1581 See also F M Padelford, Select Translations from Scaliger’s Poetics (New York, 1905)

[57] See above, Du Bellay, Chapter II, pp. 3, 6.

[58] See H B Charlton, Castelvetro’s Theory of Poetry (Manchester, 1913)

[59] Lodge’s feebler Defence of Poetry (1579) has little other interest than the historical, i.e., as a reply to Gosson’s attack on the stage.

[60] In Smith’s reprint shortened by summary

[61] Gregory Smith, II, 327-355.

[62] Gregory Smith, II, 356-384; Arthur Colby Sprague, Samuel Daniel, Poems and a Defence of Ryme (Cambridge, Harvard University Press, 1930).

[63] Patrizzi’s refutation of Tasso, 68, 116, 144/5, 173, 175

[64] Nevertheless two of his references (V. 116; VI. 125) suggest, perhaps without his intention, a relation between Plato’s Symposium and Aristotle’s idea of creative imitation.

[65] Pellissier’s long introduction and valuable notes, though they need a few corrections by later studies, remain one of the most important surveys of the French development of poetic in the sixteenth century

[66] But Vauquelin with Tasso bids poets leave pagan myth for Christian themes, though perhaps he refers only to subject; and

he recognizes the place of Montemayor’s Diana among pastorals.

[67] For Aristotle’s imitation, see ARP, pages 139 ff

[68] D. L. Clark, Rhetoric and Poetry in the Renaissance (New York, 1922).

[69] Cf. in Chapter VII Giraldi’s theory of the romance.

[70] This is inferred from a commendatory letter of Bartolomeo Cavalcanti prefixed to this fourth (1580) edition.

[71] For editions and translations, see Louis Berthé de Besaucèle, J.-B. Giraldi (thesis at the University of Aix-enProvence, Paris, 1920), pp. 109, 255, 258; for the French translator, Gabriel Chappuys, see p. 261.

[72] See above, p 198

[73] For the Gorgian figures, see MRP and Croll’s introduction to his edition of Euphues.

[74] Samuel Lee Wolff, The Greek Romances in Elizabethan Prose Fiction (New York, Columbia University Press, 1912)

[75] Op. cit., pp. 173 seq. The quotation is at p. 177.

[76] H Brown, Rabelais in English Literature (Harvard Press, 1933), p 19

[77] Cf. Budé, Chapter I, for Renaissance complacency.

[78] Above, Chapter II

[79] J. Plattard, François Rabelais (Paris, 1932), p. 194.

[80] Ibid., p. 140.

[81] Ibid., pp. 115 seq.

[82] Plattard, p 117

[83] For narratio, see ARP.

[84] In the prefatory epistle to Petrus Aegidius about two-thirds of the first hundred clauses conform to the cursus of the curial dictamen (MRP). These clauses compose about twenty sentences ending: planus, 6 (30%); tardus, 2 (10%); velox, 7 (35%); unconformed, 5 (25%). Inconclusive, this may be worth further study.

[85] See above, Chapter VIII

[86] Citations are from Jacobus Stoer’s edition of 1595.

[87] The fourth edition, cited here, by Gabriel Cartier, 1599. Meantime Bodin had published in 1586 a revised edition in Latin, De re publica libri vi

[88] Edition cited Edinburgh (Freebairn), 1715, Opera omnia, ed. Thomas Ruddiman, Vol. I.

[89] See F Strowski, Montaigne (Paris, 1931)

[90] “Qu’il n’est rien si contraire à mon style qu’une narration estendue (i.e., narratio, sustained exposition); je me recouppe si souvent à fault d’haleine; je n’ay ni composition ny explication qui vaille” (I. xxi).

[91] This is the doctrine of Quintilian, whom he quotes ARP

INDEX

Abraham and Isaac, 136

Accademia della Crusca, 30

Achilleis (Statius), 185

Achilles Tatius, 79, 87, 188

Acciajuoli, Donato, 214

Actores octo, see Auctores octo

Adrian, Cardinal Corneto, 24

Aeneid, 102, 104, 114, 121, 126, 127, 165, 185

Aeschines, 26

Alain de Lille, 9, 10

Alamanni, Luigi, 13, 67, 96-98

Alberti, Leone Battista, 27

Aldus Manutius, 9, 20

Alexandrian literature, 7, 78, 90

Alexandrianism, 123, 188

Allegory, 123, 130, 133

Alliteration, 87, 129, 199

Alunno, Francesco, 31, 37

Amadis of Gaul, 95

Amants fortunés, Les, 194

Ameto (Boccaccio), 82, 84

Aminta (Tasso), 87, 147, 153

Amyot, Jacques, 23, 90, 238

Anacreon, 21, 79

Annales d’Aquitaine (Bouchet), 134

Anthology, 7, 21, 79, 104

Antigone (Garnier), 142

Antigone (Sophocles), 142

Aphthonius, 21

Apollonius Rhodius, 21, 79, 188

Apuleius, 93, 179, 188

Aquila, Serafino d’, 69

Aquinas, 8, 9

Arcadia (Sannazaro), 83-87

Arcadia (Sidney), 90, 202

Aretino, Leonardo, see Bruni, Leonardo

Ariosto, 9, 11, 24, 30, 67, 91, 96, 101, 104, 111-23, 131, 142, 143, 147, 159, 160, 164, 168, 177, 179, 184, 205

Aristotle, 15, 20, 25, 26, 53, 55, 61, 62, 63, 133, 145, 158, 159, 164, 165, 166, 167, 168, 169, 172, 175, 176, 177, 178, 179, 184, 185, 186, 187, 189, 238

“Ars poetica” (Horace), 10, 15, 133, 155, 158, 161, 163, 164, 165, 171, 186, 188

Arte of English Poesie (Campion), 183

Arte of English Poesie (Puttenham), 182

Arte poetica (Minturno), 44n, 168

Arthurian cycle, 96, 98

Art of rhetorique, The (Wilson), 62

Art poétique, L’ (Peletier), 163-64

Art poétique, L’ (Ronsard), 175

Art poétique, L’ (Vauquelin de la Fresnaye), 186

Arts poétiques, 15, 127

Ascham, Roger, 37, 38n, 183

Astrophel and Stella (Sidney), 77

As You Like It (Shakspere), 146

Athenaeus, 21

Auctores octo, 10, 81

Augustan Latin, 18, 44, 58, 65, 234

Aulus Gellius, 10, 188

Aurispa, 20

Ausonius, 10, 79, 188

Avarchide (Alamanni), 96

Ayres, H. M., quoted, 147n

Baif, 34

Balade, 10

Balsamo-Crivelli, Gustavo, 190

Bandello, Matteo, 190-94, 197, 198-99

Bankette of Sapience (Elyot), 227

Baptistes (Buchanan), 139

Basia (Secundus), 66

Bede, 9

Bellay, Cardinal du, 211

Bellay, Joachim du, 10, 32, 34, 69, 163, 238

Belleau, Remi, 21

Belleforest, 198

Bembo, 9, 15, 22, 26, 28, 30, 31, 36, 87, 170, 179, 188

Beolco, Angelo, see Ruzzante

Berni, 111

Besaucèle, 195n

Bessarion, Johannes, 20, 39

Beza, 179

Bibbiena, Cardinal, 179

Blason, 118

Boccaccio, 5, 6, 13, 14, 15, 20, 23, 27, 28, 29, 31, 32, 60, 67, 82, 84, 87, 104, 121, 153, 170, 177, 179, 185, 186, 194-96

Bodin, 228, 229, 230, 230n, 231, 232

Boece, Hector, 216

Boethius, 9, 25, 37, 85

Boiardo, Matteo Maria, 11, 91, 92, 93, 94, 101-11, 120, 124, 125, 127, 159

Bouchet, Jean, 134

Boulanger, André, 163

Bradamante (Garnier), 142

Brocardo, Jacopo, 63

Brome Abraham and Isaac, 136

Brown, H., 202n

Browne, Sir Thomas, 52

Bruni, Leonardo, 39, 214-17, 226

Buchanan, George, 17, 137-39, 179, 216, 226, 230, 231

Bucolics (Vergil), 80, 165

Bucolicum carmen (Petrarch), 82

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