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Catalytic Oxidation Of Volatile Compounds Generated During Frying Process Using Sunflower Oil
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Book Synopsis Catalytic Oxidation of Volatile Compounds Generated During Frying Process Using Sunflower Oil by : Arda Aytaç
Download or read book Catalytic Oxidation of Volatile Compounds Generated During Frying Process Using Sunflower Oil written by Arda Aytaç and published by . This book was released on 2014 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main goal of this study is to investigate the effect of metal type, metal oxide type and metal/oxide loading on the conversion as a function of temperature for the combustion of sunflower oil over modified single step sol-gel made Al2O3 supported metal and mixed metal oxides. All catalysts were tested at 170 oC and catalysts giving good activity among them were tested also at 195 oC. As a monometallic catalysts, Ni/Al2O3 (10, 25, 50 % Ni loaded), Ni/Al2O3 (50 % Ni loaded) derived from different Ni precursors, Mn/Al2O3 (50, 70 % Mn loaded) and as a bimetallic catalysts, Ni- Mn2O3/Al2O3 with Ni/Mn mass ratios of 20:56 and 23:66 catalysts were synthesized by a modified single step sol-gel method. In addition, in synthesizing step of bimetallic catalysts, the order of adding precursor was studied. The catalytic activities of all the catalysts were compared to 3% Pt/alumina. The combustion performances of pure Al2O3 and catalyst coated aluminum plates were also considered and volatile compound analysis was monitored by GC-MS and the amounts of CO and CO2 generated during the combustion were calculated quantitatively from GC analyses. The characterization of the samples was performed by XRD and BET techniques and it was observed that among the monometallic oxide catalysts, 50% MnxOy/Al2O3 showed slightly better activity at 170 oC due to the its highly reducible oxide property. Among mixed metal/metal oxide catalysts, 20% Ni/56% Mn2O3/Al2O3 (First Ni precursor added) was the catalyst demonstrated the highest catalytic activity at both temperatures. It seems to be due to the interaction between nickel and manganese oxide. In addition, the combustion was also carried out by using catalyst coated aluminum plates to observe if the best catalyst formulation found from the studies on the powder catalysts would be applicable for the self-cleaning metal plates used in the household ovens. In fact, the catalyst coated plates showed higher conversion at 170 oC in 1 h than that observed on the powder catalyst due to the elimination of internal mass transfer limitation.
Book Synopsis Frying of Food by : Dimitrios Boskou
Download or read book Frying of Food written by Dimitrios Boskou and published by CRC Press. This book was released on 2016-04-19 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frying of Food is the first reference to examine frying of food from the point of view of changes occurring to biologically-active constituents and the effects of such changes on the stability, performance and nutritive value of frying oil. It focuses on the nature of the frying media and discusses changes to non-glyceride components, especially nu
Book Synopsis Chemical Factors Affecting Degradation Processes of Vegetable Oils During Frying by : Xin Tian
Download or read book Chemical Factors Affecting Degradation Processes of Vegetable Oils During Frying written by Xin Tian and published by . This book was released on 2013 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: Food oils degrade rapidly when exposed to high temperatures in frying, but the mechanisms responsible have never been fully elucidated. Thermal degradation is usually described as a combination of hydrolysis and accelerated autoxidation. Thermal scissions of lipid chains have also been identified but remain controversial and largely ignored. This research sought to elucidate the reactions underlying thermal degradation, reconcile roles of thermal scission and autoxidation, and determine where catalytic factors intervene in degradation at frying temperatures. Thermal degradation processes were investigated in high oleic sunflower oil:corn oil blends (60:40 w/w) heated in an OxipresTM oxygen bomb at 180°C for three hours under 2 bars (O2, air, or O2/N2 blends) to determine rates and amounts of oxygen consumed during heating. Degradation products (conjugated dienes, peroxide values, aldehydes, free fatty acids) were measured in samples removed at various time intervals. In a parallel study, volatiles released during heating were trapped and analyzed by GC-MS. Effects of oil state and pre-oxidation were evaluated using stripped, fresh, and steady-state frying versions of the oil blend. Effects of oxygen, metals, water, phospholipids and free fatty acids were tested individually and in combinations to reveal synergistic catalysis of degradation. Results supported thermal scission of lipid acyl chains as the dominant process controlling degradation at high temperatures, generating radicals that are the precursors for a broad range of downstream products. Terminal peroxyl radicals formed by addition of oxygen to thermal scission radicals abstract hydrogens from lipid chains to initiate autoxidation chains as a secondary process. Oxygen and water were the major forces driving secondary reactions. Traditional catalytic factors known to induce lipid oxidation had relatively minor effects alone but in combination with water triggered rapid consumption of O2. Except for oxygen, catalytic factors affected secondary oxidation processes and product distributions rather than initiating oxidation. Mismatch between O2 consumption and levels of oxidation products demonstrated presence of reaction pathways that consumed oxygen but led to products other than those measured. Data was integrated to develop a new reaction scheme for thermal degradation of oils. Application of this new information can be used to improve stabilization of frying oils.
Book Synopsis Lipid Oxidation by : Edwin N. Frankel
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.
Book Synopsis Lipid Oxidation in Food by : Allen J. St. Angelo
Download or read book Lipid Oxidation in Food written by Allen J. St. Angelo and published by . This book was released on 1992 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developed from a symposium at the 202nd National Meeting of the ACS, New York City, August 1991, this volume contains 20 papers in the areas of mechanisms of free-radical processes, prevention of lipid oxidation, methodologies for assessing lipid oxidation products, and processing effects on lipid oxidation. Commodities covered include beef, pork, fresh and saltwater fish, peanuts, vegetable oils, and baby foods. Annotation copyright by Book News, Inc., Portland, OR
Book Synopsis Flavor Chemistry of Ethnic Foods by : Fereidoon Shahidi
Download or read book Flavor Chemistry of Ethnic Foods written by Fereidoon Shahidi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ethnic and international foods have gradually been integrated into the daily diet in North America. However, the existing literature of flavor characteristics and chemistry of such foods remains fragmentary and diverse. This book presents a summary of the current status of knowledge in this area.
Book Synopsis Food Safety and Toxicity by : John De Vries
Download or read book Food Safety and Toxicity written by John De Vries and published by CRC Press. This book was released on 2021-10-08 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Food Safety and Toxicity examines the many problems and changes in food safety and toxicity. From a natural science viewpoint, this informative book takes on challenging and important topics impacting food researchers, regulators, producers, healthcare providers, educators, and consumers. It is organized into three main sections. Section 1 explores the relationship between the origin or formation of potentially toxic compounds and their eventual ingestion. Section 2 picks up with information on the potential consequences of this ingestion, and Section 3 concludes with the discussion of prevention and minimization of health risks. By emphasizing food safety, rather than nutritional toxicology, this book puts food hazards and their health risks in true perspective. It also explores the complementary roles of toxicology and epidemiology in studying associations between nutrition and adverse health effects and in assessing toxicological risks from food components in a deliberate manner. Food Safety and Toxicity, with clear, non-technical language and valuable insight, brings you up-to-date on the significant food safety issues confronting us today.
Book Synopsis Handbook of Olive Oil: Analysis and Properties by : Ramon Aparicio
Download or read book Handbook of Olive Oil: Analysis and Properties written by Ramon Aparicio and published by Springer Science & Business Media. This book was released on 2013-11-09 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new olive oil handbook provides a wealth of detail about the analysis and properties of olives and their oil. It covers technological aspects and biochemistry, a description of detailed techniques, and an analysis of olive oil from the standpoint of general methodology.
Book Synopsis Designing Foods by : National Research Council
Download or read book Designing Foods written by National Research Council and published by National Academies Press. This book was released on 1988-02-01 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: This lively book examines recent trends in animal product consumption and diet; reviews industry efforts, policies, and programs aimed at improving the nutritional attributes of animal products; and offers suggestions for further research. In addition, the volume reviews dietary and health recommendations from major health organizations and notes specific target levels for nutrients.
Download or read book Chemical Abstracts written by and published by . This book was released on 1991 with total page 2470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Edible Oil Processing by : Wolf Hamm
Download or read book Edible Oil Processing written by Wolf Hamm and published by John Wiley & Sons. This book was released on 2013-08-05 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oils and fats are almost ubiquitous in food processing, whether naturally occurring in foods or added as ingredients that bring functional benefits. Whilst levels of fat intake must be controlled in order to avoid obesity and other health problems, it remains the fact that fats (along with proteins and carbohydrates) are one of the three macronutrients and therefore an essential part of a healthy diet. The ability to process oils and fats to make them acceptable as part of our food supplies is a key component in our overall knowledge of them. Without this ability, the food that we consume would be totally different, and much of the flexibility available to us as a result of the application of processing techniques would be lost. Obviously we need to know how to process fatty oils, but we also need to know how best to use them once they have been processed. This second edition of Edible Oil Processing presents a valuable overview of the technology and applications behind the subject. It covers the latest technologies which address new environmental and nutritional requirements as well as the current state of world edible oil markets. This book is intended for food scientists and technologists who use oils and fats in food formulations, as well as chemists and technologists working in edible oils and fats processing.
Book Synopsis Chemical, Biological, and Functional Aspects of Food Lipids by : Zdzislaw Z. E. Sikorski
Download or read book Chemical, Biological, and Functional Aspects of Food Lipids written by Zdzislaw Z. E. Sikorski and published by CRC Press. This book was released on 2010-11-04 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on years of academic and industrial research by an international panel of experts, Chemical, Biological, and Functional Properties of Food Lipids, Second Edition provides a concise, yet well-documented presentation of the current state of knowledge on lipids. Under the editorial guidance of globally recognized food scientists Zdzislaw E. Siko
Book Synopsis The Maillard Reaction by : H E Nursten
Download or read book The Maillard Reaction written by H E Nursten and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research in the field of the Maillard reaction has developed rapidly in recent years as a result of not only the application of improved analytical techniques, but also of the realisation that the Maillard reaction plays an important role in some human diseases and in the ageing process. The Maillard Reaction: Chemistry, Biochemistry, and Implications provides a comprehensive treatise on the Maillard reaction. This single-author volume covers all aspects of the Maillard reaction in a uniform, co-ordinated, and up-to-date manner. The book encompasses: the chemistry of non-enzymic browning; recent advances; colour formation in non-enzymic browning; flavour and off-flavour formation in non-enzymic browning; toxicological aspects; nutritional aspects; other physiological aspects; other consequences of technological significance; implications for other fields; non-enzymic browning due mainly to ascorbic acid; caramelisation; inhibition of non-enzymic browning in foods; and inhibition of the Maillard reaction in vivo. The Maillard Reaction: Chemistry, Biochemistry, and Implications will be welcomed as an important publication for both new and experienced researchers who are involved in solving the mysteries and complexities of Maillard chemistry and biochemistry. It will also appeal to students, university lecturers, and researchers in a variety of fields, including food science, nutrition, biochemistry, medicine, pharmacology, toxicology, and soil science.
Book Synopsis Autoxidation in Food and Biological Systems by : M.G. Simic
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.
Book Synopsis Antioxidants in Food by : Jan Pokorny
Download or read book Antioxidants in Food written by Jan Pokorny and published by CRC Press. This book was released on 2001-04-12 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antioxidants are an increasingly important ingredient in food processing. Their traditional role is, as their name suggests, in inhibiting the development of oxidative rancidity in fat-based foods, particularly meat and dairy products and fried foods. However, more recent research has suggested a new role in inhibiting cardiovascular disease and cancer. Antioxidants in Food: Practical Applications provides a review of the functional role of antioxidants and discusses how they can be effectively exploited by the food industry. The first part of the book looks at antioxidants and food stability with chapters on the development of oxidative rancidity in foods, methods for inhibiting oxidation, and ways of measuring antioxidant activity. Part 2 looks at antioxidants and health, including chapters on antioxidants and cardiovascular disease, their antitumour properties, and bioavailability. A major trend in the food industry, driven by consumer concerns, has been the shift from the use of synthetic to natural ingredients in food products. Part 3 looks at the range of natural antioxidants available to the food manufacturer. The final section of the book looks at how these natural antioxidants can be effectively exploited, covering such issues as regulation, preparation, antixoxidant processing functionality and their use in a range of food products from meat and dairy products, frying oils and fried products, to fruit and vegetables and cereal products.
Book Synopsis Methods to Access Quality and Stability of Oils and Fat-Containing Foods by : Kathleen Warner
Download or read book Methods to Access Quality and Stability of Oils and Fat-Containing Foods written by Kathleen Warner and published by The American Oil Chemists Society. This book was released on 1995-01-30 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methods to Assess Quality and Stability of Oils and Fat-Containing Foods is a valuable and unique resource for food scientists and oil chemists, a welcome addition to the libraries of scientists working in product development and quality control.
Book Synopsis The Chemistry of Oils and Fats by : Frank Gunstone
Download or read book The Chemistry of Oils and Fats written by Frank Gunstone and published by John Wiley & Sons. This book was released on 2009-02-12 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: The three major macronutrients are proteins, carbohydrates, andlipids (oils and fats). This book is devoted to lipids, which arean important part of life for all of us. What are these materialsin molecular terms? Where do they come from? What happens to thembetween the harvesting of crops and the appearance of the oils andfats in different products in the supermarket? How does natureproduce these molecules and can we act on nature to modify thematerials to increase their beneficial properties? How importantare the minor products present in the fats that we consume? Sinceoils and fats vary, how can we analyse them? What are theirphysical, chemical and nutritional properties? How do the fats thatwe consume affect our health and well-being in both quantitativeand qualitative terms? What are their major food and non-fooduses? This book provides a broad source of reference on oils and fatschemistry for graduates entering the food and oleochemicalindustries, postgraduate researchers and nutritionists. It offers apoint of entry to the detailed literature.
