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Coffee is one of the most popular beverages worldwide. Ready-to-drink (RTD) coffee provides consumers a convenient alternative to freshly brewed coffee. In the United States, RTD coffee has become increasingly popular because of the growing demand for convenient beverage options. However, RTD coffee requires additional processing and storage, creating challenges with flavor stability. The current understanding of RTD coffee flavor stability is limited and impedes product innovation. The overall objective of this project was to identify the non-volatile chemical compounds that impact RTD coffee flavor stability during storage using untargeted flavoromics. In Phase I, untargeted LC/MS flavoromics analysis was applied to identify chemical compounds that were generated during storage and impacted the flavor stability of ready-to-drink (RTD) coffee. Two coffee samples (Arabica and Robusta) prepared in air and under nitrogen were stored over 4 months at 30 C. Degree of difference (DOD) sensory evaluation revealed significant changes in the RTD coffee after 1, 2 and 4 months. MS chemical profiles of non-aged and aged RTD coffee samples were modeled against the DOD scores by orthogonal partial least squares (OPLS) with good fit (R2Y = 0.966) and predictive ability (Q2 = 0.960). Five highly predictive chemical features positively correlated to DOD were subsequently identified as 3-caffeoylquinic acid, 4-caffeoylquinic acid, 5-caffeoylquinic acid, 3-O-feruloylquinic acid, and 5-O-feruloylquinic acid. These five chlorogenic acids compounds in addition to quinic acid significantly increased in concentration during storage. Sensory recombination tests confirmed that these six acid compounds significantly impacted the flavor stability of RTD coffee during storage, primarily by reducing the pH of the product. In Phase II, untargeted LC/MS flavoromics analysis was applied to identify chemical compounds that were degraded during storage and impacted the flavor stability of ready-to-drink (RTD) coffee. Ten highly predictive chemical features that negatively correlated with flavor changes were selected based on the multivariate statistical model established in Phase I. Next the compounds were isolated by multi-dimensional LC fractionation and subsequently identified (MS and NMR). Quantitative analysis indicated eight of the ten compounds were significantly (p
Forty years of progress in the fields of gas chromatography and data collection have culminated in flavoromics. This is a combination of chemometrics and metabolomics. Essentially, it is the non-targeted way of rapidly collecting a significant amount of data from a wide range of sample populations and using the data to study complicated topics. Now that we have the required tools, we can carry out high-throughput trace investigations that incorporate both gustatory and olfactory signals. Flavoromics: An Integrated Approach to Flavor and Sensory Assessment describes the tools to do high-throughput, trace analyses that represent both taste and olfaction stimuli. It explains how today's single sample research will generate thousands of data points, which are loaded into sophisticated statistical analysis algorithms to establish what stimuli are responsible for flavor. This cutting-edge equipment will enable us to create flavorings and perfumes that are more realistic and superior. Key Features: Includes a detailed section on data handling/mining Section 4 describes a broad overview of different food matrices Points out the integration of flavoromics with advanced separation methods, data management, statistical modeling, and variable selection This book represents a revolutionary tool waiting to help make better, truer to life flavorings and fragrances.
The increasing demand for healthy foods has resulted in the food industry developing functional foods with health-promoting and/or disease preventing properties. However, many of these products bring new challenges. While drugs are taken for their efficacy, functional foods need to have tastes that are acceptable to consumers. Bitterness associated with the functional foods is one of the major challenges encountered by food industry today and will remain so in years to come. This important book offers a thorough understanding of bitterness, the food ingredients that cause it and its accurate measurement. The authors provide a thorough review of bitterness that includes an understanding of the genetics of bitterness perception and the molecular basis for individual differences in bitterness perception. This is followed by a detailed review of the chemical structure of bitter compounds in foods where bitterness may be considered to be a positive or negative attribute. To better understand bitterness in foods, separation and analytical techniques used to identify and characterize bitter compounds are also covered. Food processing can itself generate compounds that are bitter, such as the Maillard reaction and lipid oxidation related products. Since bitterness is considered a negative attribute in many foods, the methods being used to remove and/mask it are also thoroughly discussed.
Coffee, one of the most commercially important crops grown, is distributed and traded globally in a multi-million dollar world industry. This exciting new book brings together in one volume the most important recent developments affecting the crop. Contributions from around 20 internationally-respected coffee scientists and technologists from around the world provide a vast wealth of new information in the subject areas in which they are expert. The book commences with three cutting-edge chapters covering non-volatile and volatile compounds that determine the flavour of coffee. Chapters covering technology follow, including comprehensive information on developments in roasting techniques, decaffeination, the science and technology of instant coffee and home / catering beverage preparation. The physiological effects of coffee drinking are considered in a fascinating chapter on coffee and health. Agronomic aspects of coffee breeding and growing are covered specifically in chapters concentrating on these aspects, particularly focussing on newly-emerging molecular and cellular techniques. Finally, recent activities of some international organisations are reviewed in a lengthy appendix. The editors of Coffee: Recent Developments have drawn together a comprehensive and extremely important book that should be on the shelves of all those involved in coffee. The book is a vital tool for food scientists, food technologists and agricultural scientists and the commercially important information included in the book makes it a 'must have reference' to all food companies involved with coffee. All libraries in universities, and research stations where any aspect of the coffee crop is studied or taught should have copies of the book available. R. J. Clarke, also co-editor of the widely-acclaimed six-volume work Coffee published between 1985 and 1988, is a consultant based in Chichester U. K. O. G. Vitzthum, formerly Director of Coffee Chemistry Research worldwide at Kraft, Jacobs, Suchard in Bremen, Germany is Honorary Professor at the Technical University of Braunsweig, Germany and Scientific Secretary of the Association Scientifique Internationale du Cafe (ASIC), in Paris France.
We live in an era of constantly accelerating scientific and social change brought about by developments in education, technology and modem communication. This is a time of questioning and new perceptions affecting all facets of our daily lives. With increasing frequency issues are being raised which demand answers and new approaches. This increases the responsibility of those involved in determining the future shape of the world of coffee. The dependence of developing countries on income generated from trade in coffee, the emergence of new processing techniques, health implications and questions of quality of coffee in the cup are among the issues related to coffee. The knowledge required to form the basis to resolve these issues for the benefit of the multitudes of coffee drinkers will be generated only through the systematic build up of information and its subsequent evaluation. Science and modem technology provide essential tools for these endeavours. This book should act as a stimulant to thought and creativity so the issues facing the industry may be fully analysed and a healthy future for coffee secured. It marks a step forward in laying the foundation for coffee's future. Alexandre F. Beltrao Executive Director International Coffee Organisation London PREFACE We have long been fascinated by coffee and on many occasions bemoaned the lack of a comprehensive text dealing with the varied scientific aspects. With the encouragement of Tim Hardwick of Croom Helm Ltd, we decided to pool our resources and produce just such a multi-author volume.
Stevia rebaudiana is a remarkable South American plant that has become widely used in certain parts of the world as a natural sweetening agent and dietary supplement. Purified extracts of S. rebaudiana have been used as sweeteners and flavor enhancers in the food industry in Japan for over a quarter of a century, and have been found to be up to 300
Food flavor, appearance, and texture are the sensory properties that influence food acceptance, and among these, flavor is usually the decisive factor for the choice of a particular product. Food Flavors: Chemical, Sensory, and Technological Properties explores the main aspects of food flavors and provides a starting point for further study in focu
The Craft and Science of Coffee follows the coffee plant from its origins in East Africa to its current role as a global product that influences millions of lives though sustainable development, economics, and consumer desire. For most, coffee is a beloved beverage. However, for some it is also an object of scientifically study, and for others it is approached as a craft, both building on skills and experience. By combining the research and insights of the scientific community and expertise of the crafts people, this unique book brings readers into a sustained and inclusive conversation, one where academic and industrial thought leaders, coffee farmers, and baristas are quoted, each informing and enriching each other. This unusual approach guides the reader on a journey from coffee farmer to roaster, market analyst to barista, in a style that is both rigorous and experience based, universally relevant and personally engaging. From on-farming processes to consumer benefits, the reader is given a deeper appreciation and understanding of coffee's complexity and is invited to form their own educated opinions on the ever changing situation, including potential routes to further shape the coffee future in a responsible manner. Presents a novel synthesis of coffee research and real-world experience that aids understanding, appreciation, and potential action Includes contributions from a multitude of experts who address complex subjects with a conversational approach Provides expert discourse on the coffee calue chain, from agricultural and production practices, sustainability, post-harvest processing, and quality aspects to the economic analysis of the consumer value proposition Engages with the key challenges of future coffee production and potential solutions