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539 kr
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The previous volumes in this series have included contributions on a varied range of topics. Some subjects were virtuaIIy self-selecting-no text on food microbiology could ignore the importance of food-borne pathogens-but others were included to iIIustrate, in some measure, the fascinating diversity of facets encompassed by the title. This same approach has been adopted in the present volume, so that while central issues, such as current views on the taxonomy of food-borne fungi, are discussed, the interfaces between 'classical' microbiology and other relevant disciplines have also been explored. The impact of economic constraints on fermentations is one such area of interaction, while the rapidly developing subject of tissue culture offers some exciting chaIIenges for any microbiologist wishing to apply his or her expertise in a somewhat paraIIel field. It can be argued, of course, that a scientific text should be held within tight guidelines, and certainly the academic demands of microbiology are becoming increasingly stringent. Nevertheless, novel ideas can often arise from a casual insight into an adjacent area of study, and it is, perhaps, appropriate that the Developments Series should find space for just a few, speculative incursions. Whatever the precise format, however, the basic intention of the series remains unaltered, and if this volume does provide food microbiologists with a useful source of information and/or further reading, then the endeavours of the authors wiII have been worthwhile.
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As with the products and processes described in Volume· I of this book, many of the technical changes associated with, for example, the manufacture of cheeses or fermented milks have been subtle rather than dramatic. Nonetheless, the importance for the dairy industry has often been profound. The market demand for dairy products containing 'health-promoting' cultures is a development that was barely discernible 10 years ago, and yet many manufacturers are now generating a whole range of bio-yoghurts and similar retail items. Similarly, the legislation covering food hygiene has been modified to place additional demands upon manufacturers, a move that has in turn encouraged the further development of analytical methods for quality controL These modifications to manufacturing practices are, along with many others, reflected in this second edition, and I acknowledge with gratitude the enthusiastic co-operation of all the authors associated with this project in bringing their disparate contributions up-to-date. R. K. ROBINSON v Preface to the First Edition Retail sales of most dairy products are still on the increase world-wide, and this expansion is, at least in part, a reflection of the fact that prices have tended to remain at a competitive level.
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Previous editions of Yoghurt: Science and Technology established the text as an essential reference underpinning the production of yoghurt of consistently high quality. The book has been completely revised and updated to produce this third edition, which combines coverage of recent developments in scientific understanding with information about established methods of best practice to achieve a comprehensive treatment of the subject. General acceptance of a more liberal definition by the dairy industry of the term yoghurt has also warranted coverage in the new edition of a larger variety of gelled or viscous fermented milk products, containing a wider range of cultures.Developments in the scientific aspects of yoghurt covered in this new edition include polysaccharide production by starter culture bacteria and its effects on gel structure, acid gel formation and advances in the analysis of yoghurt in terms of its chemistry, rheology and microbiology. Significant advances in technology are also outlined, for example automation and mechanisation. There has also been progress in understanding the nutritional profile of yoghurt and details of clinical trials involving yoghurts are described.This book is a unique and essential reference to students, researchers and manufacturers in the dairy industry.Includes developments in the understanding of the biochemical changes involved in yoghurt productionOutlines significant technological advances in mechanisation and automationDiscusses the nutritional value of yoghurt