Protein functionality is big business in the food industry, both academic and commercial. This reflects the fascination of protein chemistry and the commercial value of proteins in giving texture and substance to foods. My first encounter with the subject came about through an interest in assessing the extent of thermal damage in spray-dried proteins. A change in functional properties seemed a useful guide to the thermal damage. I found the literature replete with methods (and theory) and so did what everybody else seemed to do - I devised my own methods which were slight variations on the general theme. However, being an analyst at heart I thought there must be a systematic approach to the various tests available. This book is an attempt to assess the practice of protein functionality testing, keeping theory to a minimum, followed by a suggested 'standard' method or protocol to follow. Each chapter is devoted to a single functional property and the reader will see that attempts to 'standardise' them have had varied success, perhaps reflecting the complexity of the mechanisms at work. As mentioned above theory has been kept to a minimum but hopefully it supports the practical methodology described. I hope that the book stimulates debate on the subject; it is certainly not the last word! G. H. Contributors Dr G. E. Arteaga Centro de Investigacion en Alimentation y Desarrollo, Hermosillo, Sonora AP 1735, Mexico Dr. S.

Synopsis

Protein in foods is important mainly as a source of nutrition. However, the ability of proteins to impart other favorable characteristics is known as functionality. Functional properties include viscosity, emulsification and foam formation. Twenty percent of the proteins used in food systems are thought to be there for functional reasons rather than nutritional reasons. This book reviews the most important techniques for the assessment for protein. Functionality, in the light of current theory, then suggests a 'standard' method applicable to a wide variety of situations. The subject is of large and growing importance to the food industry, where there is enormous pressure to create increasing numbers of new products with improved characteristics.In this book, an international team of authors pull together information which has previously only been available in various academic and technical journals. Industrial food technologists, chemists, biochemists and microbiologists will find this book an essential source of information, while students of food science, biochemistry and microbiology will use it as a reference source.

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