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Atmospheric Oxidation And Antioxidants

Author: Gerard Meurant
Publisher: Elsevier
ISBN: 0444597026
Size: 72.38 MB
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This volume examines the oxidation chemistry of carbon-based materials in more detail with emphasis on the technological phenomena that result from the attack of oxygen and the practical procedures developed to prevent them.

Atmospheric Oxidation And Antioxidants

Author: Gerald Scott
Publisher: Elsevier Science Limited
ISBN: 9780444896186
Size: 34.58 MB
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Volume III addresses our present understanding of how oxidation is involved both positively and negatively in life processes. This is a more recent and rapidly developing aspect of oxidation chemistry and many of the concepts still have to be proved by rigorous scientific investigation. Nevertheless, the mechanistic principles developed as a result of studies in vitro over the years now provide the basis for understanding the complex oxidation chemistry of life processes and its control by biological antioxidants.

Antioxidants In Science Technology Medicine And Nutrition

Author: G. Scott
Publisher: Elsevier
ISBN: 0857099930
Size: 46.59 MB
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The use of antioxidants is widespread throughout the rubber, plastics, food, oil and pharmaceutical industries. This book brings together information generated from research in quite separate fields of biochemical science and technology, and integrates it on a basis of the common mechanisms of peroxidation and antioxidant action. It applies present knowledge of antioxidants to our understanding of their role in preventing and treating common diseases, including cardiovascular disease, cancer, rheumatoid arthritis, ischemia, pancreatitis, hemochromatosis, kwashiorkor, disorders of prematurity and disease of old age. Antioxidants deactivate certain harmful effects of free radicals in the human body due to biological peroxidation, and thus prevent protection against cell damage. The book is of considerable interest to scientists working in the materials and foodstuff industries, and to researchers seeking information on the connection between diet and health, and to those developing new drugs to combat diseases associated with oxidative stress. It is important also throughout the non-medical world, especially to the work force within the affected industries. Examines research in separate fields of biochemical science and technology and integrates it on a basis of the common mechanisms of peroxidation and antioxidant action Applies present knowledge of antioxidants to our understanding of their role in preventing and treating common diseases, including cardiovascular disease, cancer, rheumatoid arthritis and others

Biodegradable Polymers And Plastics

Author: Emo Chiellini
Publisher: Springer Science & Business Media
ISBN: 1441992405
Size: 38.92 MB
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Synthetic and semi-synthetic polymeric materials were originally developed for their durability and resistance to all forms of degradation including biodegradation. Such materials are currently widely accepted because of their ease of processability and amenability to provide a large variety of cost effective items that help to enhance the comfort and quality of life in the modern industrial society. However, this widespread utilization of plastics has contributed to a serious plastic waste burden, and the expectation for the 21st century is for an increased demand for polymeric material. This volume focuses on a more rational utilization of resources in the fabrication, consumption and disposal of plastic items, specifically: -Environmentally Degradable Polymeric Materials (EDPs); -Water-soluble/Swellable Biodegradable Polymers; -EDPs from Renewable Resources; -Biopolymers; -Bioresorbable Materials for Biomedical Applications; -Biorelated Polymers; -Standards and Regulations on EDPs.

Food Antioxidants

Author: B. J. Hudson
Publisher: Springer Science & Business Media
ISBN: 9400907532
Size: 29.17 MB
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Antioxidants are present naturally in virtually all food commodities, providing them with a valuable degree of protection against oxidative attack. When food commodities are subjected to processing, such natural antioxidants are often depleted, whether physically, from the nature of the process itself, or by chemical degradation. In conse quence, processed food products usually keep less well than do the commodities from which they originated. Ideally, food producers would like them to keep better. This objective can often be achieved by blending natural products rich in antioxidants with processed foods, or by using well recognised antioxidants as food additives. In order to understand their action, and hence to apply antioxidants intelligently in food product formulation, some knowledge of the mechanisms by which they function is necessary. This is complex and of antioxidative may rely on one or more of several alternative forms intervention. Accordingly, the various mechanisms that may be relevant are discussed in Chapter 1, in each case including the 'intervention' mechanism. When present in, or added to, foods antioxidants are functional in very small quantities, typically, perhaps, at levels of 0·01 % or less.

Oxidation And Antioxidants In Organic Chemistry And Biology

Author: Evgeny T. Denisov
Publisher: CRC Press
ISBN: 142003085X
Size: 27.53 MB
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Providing a comprehensive review of reactions of oxidation for different classes of organic compounds and polymers, and biological processes mediated by free radicals, Oxidation and Antioxidants in Organic Chemistry and Biology puts the data and bibliographical information you need into one easy-to-use resource. You will find up-to-date information about mechanisms of action of antioxidants, their reactivity, reactions of intermediates, synergism, and antioxidants with cyclic mechanism action. Supplying useful, quantitative data in tables that make the information easy to find, the authors highlight the peculiarities of mechanisms involved in the oxidation of hydrocarbons, polymers, and different organic compounds. The book provides tabulated values of strengths of C-H bonds of oxygen-containing compounds; of O-H bonds of hydroperoxides, alcohols, and acids; and of attacked antioxidant bonds. The authors collect and discuss over 3000 rate constants of different reactions of peroxyl radicals in oxidation and co-oxidation. They describe a new semiempiric theory of reactivity of reactants in elementary oxidative steps and the algorithm of calculation of activation energies, rate constants, and geometrical parameters of the transition states of free radical reactions. After elucidating the chemistry and kinetics of antioxidant action, the book covers oxidative processes that occur in biological systems.

Inhibition Of Chain Reactions

Author: V V Azatyan
Publisher: CRC Press
ISBN: 9789069940021
Size: 37.80 MB
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This text explores nonbranching reactions, including in-depth information on the inhibitors of free radical polymerisation and the mechanisms of antioxidants on oxidationprocesses. Auto-initiated chain reactions are also explored, with detailed descriptions on the kinetics, mechanisms, and inhibition of the autoxidation of organic compounds, A special chapter deals with the synergism of antioxidant actions. The theory of chain-branching reactions is investigated, and a large amount of new experimental data concerning the use of chemical additives to regulate combustion processes is also presented, including the mode of chain thermal explosion.

Iodine Chemistry And Applications

Author: Tatsuo Kaiho
Publisher: John Wiley & Sons
ISBN: 1118878655
Size: 67.24 MB
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This book comprehensively covers iodine, its chemistry, and itsrole in functional materials, reagents, and compounds. • Provides an up-to-date, detailed overview of iodinechemistry with discussion on elemental aspects: characteristics,properties, iodides, and halogen bonding • Acts as a useful guide for readers to learn how tosynthesize complex compounds using iodine reagents orintermediates • Describes traditional and modern processingtechniques, such as starch, cupper, blowing out, and ion exchangeresin methods • Includes seven detailed sections devoted to theapplications of iodine: Characteristics, Production, Synthesis,Biological Applications, Industrial Applications, BioorganicChemistry and Environmental Chemistry, and Radioisotopes • Features hot topics in the field, such as hypervalentiodine-mediated cross coupling reactions, agrochemicals, dyesensitized solar cells, and therapeutic agents

Natural Extracts Using Supercritical Carbon Dioxide

Author: Mamata Mukhopadhyay
Publisher: CRC Press
ISBN: 9781420041699
Size: 64.98 MB
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Synthesizing research from a wide variety of sources, this work offers a convenient guide to a clean, safe, inexpensive, non-toxic, non-polluting solvent that performs better than most conventional solvents. Natural Extracts Using Supercritical Carbon Dioxide reviews recent development in the technology and its applications to the food, flavor, fragrance, and pharmaceutical industries. It outlines the many advantages the method has over traditional methods like steam distillation, solvent extraction, and molecular distillation and it supports the popular trend toward the use of natural products in these industries.