Download or read book Oxidative Degradation of Beta carotene written by Naoki Chiba and published by . This book was released on 1967 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The role of beta-carotene degradations in the development of off-flavors in milk and milk products has not been established. The purpose of this investigation was to study the oxidation of beta-carotene and to identify volatile compounds arising from autoxidizing beta-carotene. Pure cyrstalline beta-carotene, mixed with Celite to accelerate oxidation, was oxidized at 50°C by molecular oxygen in two different systems. The peroxide value and loss of beta-carotene were measured after controlled oxidation periods. In one system the maximum peroxide value, 295 milliequivalents per 1,000 grams, occurred after three hours of oxidation. In the other system the maximum peroxide value, 586 milliequivalents per 1,000 grams, was observed after six hours of oxidation. Approximately 80 percent of the beta-carotene was decomposed within the first ten hours of oxidation. Volatile compounds from autoxidizing beta-carotene were collected by a cold-trap gas-entrainment technique. The collected compounds were subjected to gas-liquid chromatography and rapidscan mass spectrometry, and the following compounds were identified: n-pentane, ethyl ether, acetaldehyde, acetone, propanal, methyl vinyl ketone, toluene, isobutanal, 2-octanone and acetic acid. Compounds tentatively identified included diacetyl, 3-methyl- 2-pentanone, 4-methyl-3-pentan-2-one, 2-methylfuran, 1,3,3-trimethylcyclohexene, rnethyl formate, butanone, 2-methyl-2-heptenal, 1, 3-dimethyl-2-ethylcyclohexane, 2-ethyl-2-hexenal, 2-formyl-3, 3- dimethylcyclohexene, 1, 1, 3-trimethyl-2-n-propylcyclohexane, 2- methyl-3-nonene and 3, 5, 5-trimethyl-4-(4'-butyl-3'-en-2'-onyl) cyclohexa-1, 3-diene. A fraction possessing a strong "nutty" aroma was tentatively identified as 2-methyl-2-heptenal. The volatile compounds identified can be predicted as degradation products of beta-carotene oxidation.
Download or read book Dietary Reference Intakes for Vitamin C Vitamin E Selenium and Carotenoids written by Institute of Medicine and published by National Academies Press. This book was released on 2000-08-27 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is the newest release in the authoritative series of quantitative estimates of nutrient intakes to be used for planning and assessing diets for healthy people. Dietary Reference Intakes (DRIs) is the newest framework for an expanded approach developed by U.S. and Canadian scientists. This book discusses in detail the role of vitamin C, vitamin E, selenium, and the carotenoids in human physiology and health. For each nutrient the committee presents what is known about how it functions in the human body, which factors may affect how it works, and how the nutrient may be related to chronic disease. Dietary Reference Intakes provides reference intakes, such as Recommended Dietary Allowances (RDAs), for use in planning nutritionally adequate diets for different groups based on age and gender, along with a new reference intake, the Tolerable Upper Intake Level (UL), designed to assist an individual in knowing how much is "too much" of a nutrient.
Download or read book Kinetics of Beta carotene Degradation in an Oxygen Environment written by Maria Beatriz Abreu Gloria and published by . This book was released on 1987 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carotenoid derived Aroma Compounds written by Peter Winterhalter and published by . This book was released on 2002 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preface 1 Carotenoid-Derived Aroma Compounds: An Introduction 1 2 Analysis of Norisoprenoid Aroma Precursors 20 3 HPLC-MS Analysis of Carotenoid-Derived Aroma Precursors 36 4 CD Spectroscopy as a Powerful Tool for the Stereochemical Assignment of Carotenoid-Derived Aroma Compounds 56 5 Analyzing Carotenoid-Derived Aroma Compounds Using Gas Chromatography-Olfactometry 67 6 Carotenoid Cleavage Enzymes in Animals and Plants 76 7 Identification of [beta]-Damascenone Progenitors and Their Biogenesis in Rose Flowers (Rosa damascena Mill.) 89 8 Production of Aroma Compounds by Enzymatic Cooxidation of Carotenoids 102 9 Thermal Generation of Carotenoid-Derived Compounds 115 10 Carotenoid-Derived Aroma Compounds in Tobacco 131 11 Carotenoid-Derived Aroma Compounds in Tea 145 12 Carotenoid-Derived Aroma Compounds in Flower Scents 162 13 Bound Volatiles in Brown Boronia Flowers (Boronia megastigma) 183 14 C[subscript 13]-Norisoprenoids in the Aroma of Colombian Tropical Fruits 194 15 Carotenoid Degradation Products in Paprika Powder 206 16 Flavor Chemistry of Saffron 220 17 The Formation of [beta]-Damascenone in Wine 241 18 C[subscript 13]-Norisoprenoid Aglycon Composition of Leaves and Grape Berries from Muscat of Alexandria and Shiraz Cultivars 255 19 Effect of Sunlight Exposure on Norisoprenoid Formation in White Riesling Grapes 262 20 The Significance of 1,1,6-Trimethyl-1,2-Dihydronaphthalene in the Production of High Quality Riesling Wines 273 21 Formation of 1,1,6-Trimethyl-1,2-Dihydronaphthalene and Other Norisoprenoids in Wine: Considerations on the Kinetics 285 Author Index 303 Subject Index 304.
Download or read book Antioxidants in Sport Nutrition written by Manfred Lamprecht and published by CRC Press. This book was released on 2014-09-17 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of antioxidants in sports is controversial due to existing evidence that they both support and hinder athletic performance. Antioxidants in Sport Nutrition covers antioxidant use in the athlete ́s basic nutrition and discusses the controversies surrounding the usefulness of antioxidant supplementation. The book also stresses how antioxidants may affect immunity, health, and exercise performance. The book contains scientifically based chapters explaining the basic mechanisms of exercise-induced oxidative damage. Also covered are methodological approaches to assess the effectiveness of antioxidant treatment. Biomarkers are discussed as a method to estimate the bioefficacy of dietary/supplemental antioxidants in sports. This book is useful for sport nutrition scientists, physicians, exercise physiologists, product developers, sport practitioners, coaches, top athletes, and recreational athletes. In it, they will find objective information and practical guidance.
Download or read book Carotenoids in Health and Disease written by Norman I. Krinsky and published by CRC Press. This book was released on 2004-08-30 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first source to collect the latest evidence linking carotenoids to human health and disease, this stimulating reference studies the role of carotenoids in the prevention of chronic disease and reviews breakthrough studies from more than 40 field authorities on the latest research. The book reveals the most recent findings regarding the use of c
Download or read book Thermal Degradation of Beta carotene Under Simulated Time and Temperature Conditions of Various Food Processes written by Philip Nwanna Onyewu and published by . This book was released on 1985 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dietary Interventions in Liver Disease written by Ronald Ross Watson and published by Academic Press. This book was released on 2019-01-10 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dietary Interventions in Liver Disease: Foods, Nutrients, and Dietary Supplements provides valuable insights into the agents that affect metabolism and other health-related conditions in the liver. It provides nutritional treatment options for those suffering from liver disease. Information is presented on a variety of foods, including herbs, fruits, soy and olive oil, thus illustrating that variations in intake can change antioxidant and disease preventing non-nutrients that affect liver health and/or disease promotion. This book is a valuable resource for biomedical researchers who focus on identifying the causes of liver diseases and food scientists targeting health-related product development. - Provides information on agents that affect metabolism and other health-related conditions in the liver - Explores the impact of composition, including differences based on country of origin and processing techniques - Addresses the most positive results from dietary interventions using bioactive foods to impact liver disease, including reduction of inflammation and improved function
Download or read book Oxidative Stress and Chronic Degenerative Diseases written by Jose Antonio Morales-Gonzalez and published by BoD – Books on Demand. This book was released on 2013-05-22 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work responds to the need to find, in a sole document, the affect of oxidative stress at different levels, as well as treatment with antioxidants to revert and diminish the damage. Oxidative Stress and Chronic Degenerative Diseases - a Role for Antioxidants is written for health professionals by researchers at diverse educative institutions (Mexico, Brazil, USA, Spain, Australia, and Slovenia). I would like to underscore that of the 19 chapters, 14 are by Mexican researchers, which demonstrates the commitment of Mexican institutions to academic life and to the prevention and treatment of chronic degenerative diseases.
Download or read book Laboratory Tests and Diagnostic Procedures written by Cynthia C. Chernecky and published by Elsevier Health Sciences. This book was released on 2012-12-01 with total page 1235 pages. Available in PDF, EPUB and Kindle. Book excerpt: Find complete answers to questions such as which laboratory tests to order or what the results might mean. Laboratory Tests and Diagnostic Procedures, 6th Edition covers more tests than any other reference of its kind, with over 900 lab tests and diagnostic procedures in all. In Part I, you'll find an alphabetical list of hundreds of diseases, conditions, and symptoms, including the tests and procedures most commonly used to confirm or rule out a suspected diagnosis. In Part II, you’ll find descriptions of virtually every laboratory and diagnostic test available. This edition is updated with the latest research and over 20 NEW test entries. Written by educator Cynthia Chernecky and clinical nurse specialist Barbara Berger, this lab reference covers today’s lab tests with concise, easy-to-use information. More than 900 laboratory tests and diagnostic procedures are included — more than any other reference! Over 600 diseases, conditions, and symptoms are listed, along with the tests used to confirm them. Alphabetical organization and A-to-Z thumb tabs make it easy to find the information you’re looking for. Alternative test names and acronyms are cross-referenced to simplify lookup. Instructions for client and family teaching help you offer guidance concerning test preparation and follow-up care. Age and gender-specific norms are provided, giving you complete lifespan coverage. Risks and Contraindications are highlighted to help you safeguard your patients and provide effective care. Panic Level Symptoms and Treatment are provided for dangerously increased and decreased levels. Minimum volumes for blood samples are included, useful when a client’s blood preservation is essential, as well as information on whether blood specimens can be drawn during hemodialysis. Tests for toxic substances are included, making this a lab, diagnostic, and toxicology book all in one. Abbreviations, measurement prefixes, and symbols are listed on the front and back covers for convenience. Information on herbal supplements indicates when a client’s use of natural remedies might affect test results. Over 20 NEW test entries present the latest tests and procedures, with a strong focus on affordable, clinically relevant genetic tests. UPDATED content includes the latest research relating to accuracy of tests, diagnostic value of results, and associated cost-benefit ratios.
Download or read book Autoxidation in Food and Biological Systems written by M.G. Simic and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: The material presented in this book deals with basic mechanisms of free radical reactions in autoxidation processes and anitoxidant suppression of autoxidation of foods, biochemical models and biologi cal systems. Autoxidation in foods and corresponding biological effects are usually approached separately although recent mechanistic developments in the biochemistry and free radical chemistry of per oxides and their precursors tend to bring these two fields closer. Apparent ability of antioxidants in diets to reduce the inci dence of cancer has resulted in scrutiny of autoxidized products and their precursors as possibly toxic, mutagenic and carcinogenic agents. Mechanisms of any of these effects have been barely ad dressed. Yet we know now that free radicals, as esoteric as they were only a few decades ago, are being discovered in foods, biochem ical and biological systems and do play a role in the above-mentioned causalities. The purpose of the Workshop and the resulting book was to give a unifying approach towards study of beneficial and deleterious effects of autoxidation, based on rigorous scientific considerations. It is our hope that the material presented in this book will not only provide a review of the "state of the art" of autoxidation and anti oxidants, but also reflect the interaction which occurred during the Workshop between workers using model sytems, and food and biological systems.
Download or read book Lipid Oxidation written by Edwin N. Frankel and published by Elsevier. This book was released on 2014-01-23 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this second edition, Edwin Frankel has updated and extended his now well-known book Lipid oxidation which has come to be regarded as the standard work on the subject since the publication of the first edition seven years previously. His main objective is to develop the background necessary for a better understanding of what factors should be considered, and what methods and lipid systems should be employed, to achieve suitable evaluation and control of lipid oxidation in complex foods and biological systems. The oxidation of unsaturated fatty acids is one of the most fundamental reactions in lipid chemistry. When unsaturated lipids are exposed to air, the complex, volatile oxidation compounds that are formed cause rancidity. This decreases the quality of foods that contain natural lipid components as well as foods in which oils are used as ingredients. Furthermore, products of lipid oxidation have been implicated in many vital biological reactions, and evidence has accumulated to show that free radicals and reactive oxygen species participate in tissue injuries and in degenerative disease. Although there have been many significant advances in this challenging field, many important problems remain unsolved. This second edition of Lipid oxidation follows the example of the first edition in offering a summary of the many unsolved problems that need further research. The need to understand lipid oxidation is greater than ever with the increased interest in long-chain polyunsaturated fatty acids, the reformulation of oils to avoid hydrogenation and trans fatty acids, and the enormous attention given to natural phenolic antioxidants, including flavonoids and other phytochemicals.
Download or read book Products from Olive Tree written by Dimitrios Boskou and published by BoD – Books on Demand. This book was released on 2016-10-26 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: Olive tree products provide a number of documented presentations of the production and quality of the two most important olive tree products: virgin olive oil and table olives. It is a source that familiarizes readers with recent approaches and innovations that can be introduced in the virgin olive oil extraction and stabilization technology and the preparation of table olives with emphasis on the presence of bioactive constituents. It also describes advances in the methods of checking authenticity and in the evaluation of attributes that may influence consumers' perceptions and preferences. Other topics discussed are squalene, a trove of metabolic actions, pigments, geographical indication, biotechnology in table olive preparation, and recovery of hydroxytyrosol from olive-milling wastes.
Download or read book Kinetics of Beta carotene Degradation written by Antonio F. Smith-Molina and published by . This book was released on 1983 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carotenoid Cleavage Products written by Peter Winterhalter and published by OUP USA. This book was released on 2014-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses the latest research and developments in carotenoid cleavage reactions, stemming from an ACS Symposium.
Download or read book Carotenoids written by John T. Landrum and published by CRC Press. This book was released on 2009-12-21 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carotenoids are of great interest due to their essential biological functions in both plants and animals. However, the properties and functions of carotenoids in natural systems are surprisingly complex. With an emphasis on the chemical aspects of these compounds, Carotenoids: Physical, Chemical, and Biological Functions and Properties presents a b
Download or read book Handbook of Oxidants and Antioxidants in Exercise written by C. Sen and published by Elsevier. This book was released on 2000-02-16 with total page 1219 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in the science of exercise dates back to the time of ancient Greece. Today exercise is viewed not only as a leisurely activity but also as an effective preventive and therapeutic tool in medicine. Further biomedical studies in exercise physiology and biochemistry reports that strenuous physical exercise might cause oxidative lipid damage in various tissues. The generation of reactive oxygen species is elevated to a level that overwhelms the tissue antioxidant defense systems resulting in oxidative stress.The Handbook of Oxidants and Antioxidants in Exercise examines the different aspects of exercise-induced oxidative stress, its management, and how reactive oxygen may affect the functional capacity of various vital organs and tissues. It includes key related issues such as analytical methods, environmental factors, nutrition, aging, organ function and several pathophysiological processes.This timely publication will be of relevance to those in biomedical science and was designed to be readily understood by the general scientific audience.
