Overview

Chiral molecules are ubiquitous in nature. Thus, it is not surprising to come across this phenomenon in the world of flavor substances. This book provides an overview on the analytical procedures currently applied to analyze chiral flavor substances at trace levels. It demonstrates several examples for the application of these techniques to determine naturally occurring enantiomeric compositions of chiral key flavor compounds in various natural systems. In addition to the analytical aspects, the contributions focus on the sensory properties of enantiomers and enlarge our knowledge on the correlation between configurations and odor properties and intensities of chiral flavor compounds.The practical importance of the topic is reflected by a discussion of merits and limitations of chiral analysis for the authenticity control of food flavorings. In addition, examples for the use of enzymes and microorganisms to obtain enantiopure flavor substances and thus to meet legal requirements for natural labeling are presented. Finally, the book covers aspects recently getting more and more in the focus of flavor science: What are the physiological mechanisms underlying the perception of sensory properties and does chirality matter in that respect?

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Karl-Heinz Engel is Professor of General Food Technology at the TUM School of Life Sciences Weihenstephan of the Technische Universitat Munchen, Germany. He has published more than 280 scientific articles and contributed to various American Chemical Society Series books as author as well as co-editor. He is also involved in the safety assessment of flavorings, enzymes and novel foods performed by the European Food Safety Authority (EFSA) in Parma, Italy. Gary Takeoka is a Research Chemist in the Healthy Processed Foods Research Unit, Western Regional Research Center, U.S. Department of Agriculture in Albany, CA. He received his B.S. and M.S. in Food Science and Technology and Ph.D. in Agricultural and Environmental Chemistry, all degrees from the University of California, Davis. He has published more than 100 scientific articles and has served as chairperson, vice-chairperson and secretary of the Flavor Subdivision of the ACS Division of Agricultural and Food Chemistry.

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