多年以来,科学家们发现谷物、蔬菜、水 果、豆类等植物可减少某些慢性常见疾病,如 ) 肿瘤、心肝病、中风、糖尿病与高血压发病的 危险性,部分原因是由于植物中维生素、微量 元素及酶的抗氧化和清除自由基的作用,还有 一部分原因是由于植物中所含的尚未完全研究 清楚的物质,这些物质有促进健康的作用。我 们称之为植物化学素(Phytochemicals)

活性多糖是指具有某种特殊生理活性的多 糖化合物,本节讨论的活性多糖,包括膳食纤 维和真菌多糖两方面的内容。就膳食纤维而言, 真菌多糖属于可溶性膳食纤维,但它具有比通 常膳食纤维更重要、更明显、更特殊的生理活性

一、蛋白质 二、脂类 三、碳水化合物 四、矿物质 五、维生素 六、水

Contents PREFACE TO THE SECOND EDITION ACKNOWLEDGEMENTS 135 1 ORIGINS, GROWTH AND POTENTIAL OF DEHYDRATION Origins; Growth; Potential; Conclusions 2 FACTORY ORGANISATION

Second Edition The first edition of PRACTICAL DEHYDRATION published in 1971, was written primarily for the practical dehydrator, rather than for the chemist or theorist, whose interest in the industry might be more abstract or purely scientific

beetroot, 125 additives and process chemicals, 52 blanch air lift dryers, 83 dicing, 126 air separation, 228 apples, 170 peeling, 126 dryers, 174 ratio, 126 preparation, 172 sizing and selection, 126 ratio, 174

Published by Woodhead Publishing Limited, Abington Hall, Abington, Cambridge CB1 6AH, England First published 1971, Food Trade Press Second edition 1998, Woodhead Publishing Ltd 1998, Maurice Greensmith The author has asserted his moral rights. Conditions of sale All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy

The food manufacturing industry, in general, has always been a highly competitive business but no branch of it is more so than dehydration. Profitability hinges on so many factors, some of which are outside the manufacturer's control. One of the main hazards in this context is that of climate. Total solids in raw materials are the key to a viable operation, and, if these are low, due to wet growing conditions, the plant throughput is going to be seriously reduced

In broad terms, the quality control staff, under the supervision of a qualified food chemist, should be responsible for the following: ()The evaluation of quality of all incoming raw material, supplementary ingredients used in processing, chemicals packaging material, cellulose and other film, paper and fibreboard containers, and certain consumable stores: (2)All routine laboratory tests on raw material, finished products, lye and blancher liquor, boiler and processing water;

The size grading of dehydrates is an important function, both in the interests of quality and presentation, and also for the purpose of obtaining the optimum return on products undersize, or less than the standard cut. With almost all cut vegetables and fruits, there will be off-cuts from the dicers or cutters, which can be effectively separated from the primary product by the use of effective sieving machines