Download or read book Minor Components and Their Roles on Lipid Oxidation in Bulk Oil that Contains Association Colloids written by Bingcan Chen and published by . This book was released on 2012 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: The combination of water and surface active compounds found naturally in commercially refined vegetable oils have been postulated to form physical structures known as association colloids. This research studied the ability of 1,2-dioleoyl-sn-glycerol-3-phosphocholine (DOPC) and water to form physical structures in stripped soybean oil. Interfacial tension and fluorescence spectrometry results showed the critical micelle concentration (CMC) of DOPC in stripped soybean oil was 650 and 950 microM, respectively. Light scattering attenuation results indicated that the structure formed by DOPC was reverse micelles. The physical properties of DOPC reverse micelles were determined using small-angle X-ray scattering (SAXS) and fluorescence probes. These studies showed that increasing the water concentration altered the size and shape of the reverse micelles formed by DOPC. The impact of DOPC reverse micelles on the lipid oxidation of stripped soybean oil was investigated by following the formation of primary and secondary lipid oxidation products. DOPC reverse micelles had a prooxidant effect, shortening the oxidation lag phase of SSO at 55 °C. It also was not able to change the lipid oxidation of stripped soybean oil compared with DOPC reverse micelles at same concemtration (i.e., 950 microM). 1,2-dibutyl-sn-glycerol-3-phosphocholine (DC4PC) which has the shorter fatty acid than DOPC was not able to form association colloids and did not impact lipid oxidation rates. This indicated that the choline group of the phospholipid was not responsible for the increased oxidation rates and suggested that the physical structure formed by DOPC was responsible for the prooxidant effect. The impact of the DOPC reverse micelles on the effectiveness and physical location of the antioxidants, alpha-tocopherol and Trolox was also studied. Both non-polar (alpha-tocopherol) and polar (Trolox) were able to inhibit lipid oxidation in stripped soybean oil in the presence of DOPC reverse micelles. Trolox was a more effective antioxidant than alpha-tocopherol. Fluorescence steady state and lifetime decay studies suggested that both alpha-tocopherol and Trolox were associated with DOPC reverse micelle in bulk oil. Trolox primarily concentrated in the water pool of reverse micelle since it quenched NBD-PE fluorescence intensity with increasing concentrations. A portion of alpha-tocopherol was also associated with the aqueous phase of the DOPC reverse micelles but this was likely at the oil-water interface since alpha-tocopherol is not water soluble. The addition of ferric chelator, deferoxamine (DFO) to stripped soybean oil significantly prevented the lipid oxidation caused by DOPC reverse micelles as the lag phase was extended from 2 to 7 days. DFO was also found to increase the antioxidant activity of both Trolox and alpha-tocopherol. Trolox and alpha-tocopherol were found to be rapidly decomposed by high-valence Fe(III) while low-valence-state (Fe (II) was much less reactive. Fe(III) was also consumed by both hydrophilic Trolox and lipophilic alpha-tocopherol presumably though reduction to Fe (II). DOPC reverse micelles were able to decrease antioxidants-iron interactions as evidence by a decrease in antioxidant depletion by iron and a decrease in iron reduction by the antioxidants. These results suggested that the ability of DFO to increase the antioxidant activity of alpha-tocopherol and Trolox was due to its ability to decrease free radical production and not its ability to decrease direct iron-antioxidant interactions. Overall, the results presented in this dissertation show phospholipids and water can form reverse micelles in edible oils. These reverse micelles increase lipid oxidation rates by increasing the prooxidant activity of iron. Free radical scavenging antioxidants can inhibit oxidation promoted by the reverse micelles with polar Trolox being more effective than non-polar alpha-tocopherol presumably because Trolox is more highly associated with the reverse micelle. The reverse micelles produced by DOPC protected alpha-tocopherol and Trolox from direct degradation by iron. The knowledge gained from this study will improve our understanding of the mechanism of lipid oxidation in bulk oils which will hopefully provide new technologies to improve the oxidation stability of edible oils. For example, it may be able to use oil refining technologies to remove prooxidative minor components that for physical structure in bulk oils.
Download or read book Role of Water and Selected Minor Components on Association Colloid Formation and Lipid Oxidation in Bulk Oil written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impact of Surface Active Minor Components on Physicochemical Properties of Association Colloids and Lipid Oxidation in Bulk Oil written by Ketinun Kittipongpittaya and published by . This book was released on 2014 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lipid Oxidation in Food and Biological Systems written by Carlos Bravo-Diaz and published by Springer Nature. This book was released on 2022-02-06 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a new physical chemistry perspective on the control of lipid oxidation reactions by antioxidants, and it further explores the application of several oxidation inhibition strategies on food and biological systems. Divided in 3 parts, the book reviews the latest methods to control lipid oxidation, it examines lipid oxidation and inhibition in different food systems, and it finishes with an overview of the biological, health and nutritional effects of lipid oxidation. Chapters from expert contributors cover topics such as the use of magnetic methods to monitor lipid and protein oxidation, the kinetics and mechanisms of lipid oxidation and antioxidant inhibition reactions, interfacial chemistry, oxidative stress and its impact in human health, nutritional, sensory and physiological aspects of lipid oxidation, and new applications of plant and marine antioxidants. While focused on lipid peroxidation in food and biological systems, the chemistry elucidated in this book is applicable also to toxicology, medicine, plant physiology and pathology, and cosmetic industry. The book will therefore appeal to researchers in the lipid oxidation field covering food, biological and medical areas.
Download or read book PRO AND ANTIOXIDANT EFFECTS OF PHOSPHOLIPIDS ON LIPID OXIDATION IN BULK OIL written by Leqi Cui and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this thesis is to explore how phospholipids at concentrations similar as in refined vegetable oils impact bulk oil lipid oxidation. The possible formation of association colloids and synergism with primary antioxidants are considered. The results provided a better understanding of the pro- and antioxidant activities of phospholipids. Lipid oxidation leads to quality deterioration by generating off-flavor, nutrient loss, color alteration, texture changes, and even generation of potential toxic products. Phospholipids are important minor components in edible oil that play a role in lipid oxidation. Surface active phospholipids have an intermediate hydrophilicdoubledashlipophilic balance value, which allows them to form association colloids such as reverse micelles in bulk oil. These association colloids can influence lipid oxidation since they create lipiddoubledashwater interfaces where prooxidants and antioxidants can interact with triacylglycerols. In this study, we examined the formation of reverse micelles in a stripped oil system by dioleoyl phosphoethanolamine (DOPE) and the effect of these physical structures on lipidoxidation kinetics. The critical micelle concentration (CMC) of DOPE was approximately 200 [mu]mol/kg oil at 45 °C. Oxidation kinetics studies showed that DOPE was prooxidative when it was above its CMC (400 and 1,000 [mu]M), reducing the lag phase from 14 days (control) to 8 days. The addition of combinations of DOPE and dioleoyl phosphocholine (DOPC) resulted in formation of mixed micelles with a CMC of 80 [mu]mol/kg oil at 45 °C. These mixed micelles were also prooxidative when concentrations (100 and 500 [mu]M) were above the CMC, decreasing the lag phase from 14 to 8 days. DOPC and DOPE reverse micelles were examined on their impacts on the activity of primary antioxidants such as the nonpolar [alpha]-tocopherol and the polar trolox in stripped and commercial soybean oils. The results showed that DOPC reverse micelles decreased the activity of 100 [mu]M [alpha]-tocopherol or trolox. On the other hand, DOPE increased the antioxidant activity of both [alpha]-tocopherol and trolox. The polar trolox exhibited better antioxidant activity than the nonpolar [alpha]- tocopherol in the presence of both DOPC and DOPE reverse micelles because trolox partitioned more at the water-lipid interface, which was confirmed by a fluorescence steady state spectroscopy. Different ratios of DOPE to DOPC were added to oil containing 100 [mu]M [alpha]-tocopherol, and antioxidant activity increased with increasing DOPE/DOPC ratio. Addition of DOPE to commercial oil inhibited lipid oxidation, where as DOPC was ineffective. HPLC showed that DOPE regenerated [alpha]-tocopherol. Overall, these findings provide a better understanding of the role of phospholipids reverse micelles in lipid oxidation in edible oil and indicating that the antioxidant activity of tocopherols could be improved by utilizing phosphatidylethanolamine (PE) to engineer the properties of reverse micelles in bulk oil.
Download or read book Lipid Oxidation written by Amy S. Logan and published by Elsevier. This book was released on 2015-08-15 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lipid oxidation in food systems is one of the most important factors which affect food quality, nutrition, safety, color and consumers’ acceptance. The control of lipid oxidation remains an ongoing challenge as most foods constitute very complex matrices. Lipids are mostly incorporated as emulsions, and chemical reactions occur at various interfaces throughout the food matrix. Recently, incorporation of healthy lipids into food systems to deliver the desired nutrients is becoming more popular in the food industry. Many food ingredients contain a vast array of components, many of them unknown or constituting diverse or undefined molecular structures making the need in the food industry to develop effective approaches to mitigate lipid oxidation in food systems. This book provides recent perspectives aimed at a better understanding of lipid oxidation mechanisms and strategies to improve the oxidative stability of food systems. Five chapters on naturally-derived antioxidants that focus on applications within food systems Contributors include an international group of leading researchers from academic, industrial, and governmental entities Discusses the oxidative stability of enzymatically produced oils and fats Provides overviews on the complexities of lipid oxidation mechanisms, and emulsion systems most suseptible to rapid lipid oxidation
Download or read book Oxidation in Foods and Beverages and Antioxidant Applications written by Eric A Decker and published by Elsevier. This book was released on 2010-09-27 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oxidative rancidity is a major cause of food quality deterioration, leading to the formation of undesirable off-flavours as well as unhealthful compounds. Antioxidants are widely employed to inhibit oxidation, and with current consumer concerns about synthetic additives and natural antioxidants are of much interest. The two volumes of Oxidation in foods and beverages and antioxidant applications review food quality deterioration due to oxidation and methods for its control.The first volume focuses on oxidation mechanisms and antioxidant activity. Initial chapters in part one describe oxidation processes in foods, including the role of metals, heme proteins and lipoxygenase. The impact of oxidation on food flavour and the health aspects of oxidized fats are also covered. Final chapters in part one review the measurement of the extent of lipid oxidation and methods for food shelf-life determination. Part two discusses the ways in which antioxidants inhibit food oxidation, factors affecting antioxidant efficacy, methods to measure antioxidant activity and novel antioxidants.With its distinguished international team of editors and contributors, the two volumes of Oxidation in foods and beverages and antioxidant applications is standard references for R&D and QA professionals in the food industry, as well as academic researchers interested in food quality. Describes oxidation processes in foods, including the role of metals, heme proteins and lipoxygenase Reviews the impact of oxidation on food flavour and the health aspects of oxidized fats Discusses the ways in which antioxidants inhibit food oxidation, factors affecting antioxidant efficacy and methods to measure antioxidant activity
Download or read book Studies on the Initial Stage of Lipid Oxidation in Bulk Oils written by Elizabeth Budilarto and published by . This book was released on 2014 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Role of Endogenous Lipid Components on Vegetable Oil Stability written by Rui C. Zambiazi and published by . This book was released on 1997 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lipid Oxidation written by Edwin Nessim Frankel and published by Woodhead Publishing Limited. This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 formed cause rancidity, decreasing the quality of foods containing lipids as well as foods in which oils are used as ingredients. Products of lipid oxidation have been implicated in many vital biological reactions, and there is accumulating evidence that free radicals and reactive oxygen species participate in tissue injuries and in degenerative diseases. No one is better qualified to review this subject than Edwin Frankel, and this is likely to become the standard work on the subject.
Download or read book Lipids and Edible Oils written by Charis M. Galanakis and published by Academic Press. This book was released on 2019-10-05 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lipids and Edible Oils: Properties, Processing and Applications covers the most relevant topics of lipids and edible oils, especially their properties, processing and applications. Over the last years, researchers have investigated lipid bioavailability, authentication, stability and oxidation during processing and storage, hence the development of food and non-food applications of lipids and edible oils has attracted great interest. The book explores lipid oxidation in foods, the application of lipids as nano-carriers of food bioactive compounds, and their bioavailability, metabolism and nutritional genomics. Regarding edible oils, the book thoroughly explores their triacylglycerols content, biodiesel and energy production from vegetable oils, refining and lifecycle assessment. Written by a team of interdisciplinary experts that research lipids and edible oils, the book is intended for food scientists, technologists, engineers and chemists working in the whole food science field. Thoroughly explores the technological properties of lipids and edible oils Includes food processing by-products and microalgae as a source of lipids and edible oils Reviews novelties in edible oil products and processing, including refining techniques, biorefinery and value creation processing waste
Download or read book Handbook of Food Structure Development written by Fotis Spyropoulos and published by Royal Society of Chemistry. This book was released on 2019-10-17 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most useful properties of food, i.e. the ones that are detected through look, touch and taste, are a manifestation of the food’s structure. Studies about how this structure develops or can be manipulated during food production and processing are a vital part of research in food science. This book provides the status of research on food structure and how it develops through the interplay between processing routes and formulation elements. It covers food structure development across a range of food settings and consider how this alters in order to design food with specific functionalities and performance. Food structure has to be considered across a range of length scales and the book includes a section focusing on analytical and theoretical approaches that can be taken to analyse/characterise food structure from the nano- to the macro-scale. The book concludes by outlining the main challenges arising within the field and the opportunities that these create in terms of establishing or growing future research activities. Edited and written by world class contributors, this book brings the literature up-to-date by detailing how the technology and applications have moved on over the past 10 years. It serves as a reference for researchers in food science and chemistry, food processing and food texture and structure.
Download or read book Lipid Oxidation in Food and Biological Systems written by Carlos Bravo-Diaz and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a new physical chemistry perspective on the control of lipid oxidation reactions by antioxidants, and it further explores the application of several oxidation inhibition strategies on food and biological systems. Divided in 3 parts, the book reviews the latest methods to control lipid oxidation, it examines lipid oxidation and inhibition in different food systems, and it finishes with an overview of the biological, health and nutritional effects of lipid oxidation. Chapters from expert contributors cover topics such as the use of magnetic methods to monitor lipid and protein oxidation, the kinetics and mechanisms of lipid oxidation and antioxidant inhibition reactions, interfacial chemistry, oxidative stress and its impact in human health, nutritional, sensory and physiological aspects of lipid oxidation, and new applications of plant and marine antioxidants. While focused on lipid peroxidation in food and biological systems, the chemistry elucidated in this book is applicable also to toxicology, medicine, plant physiology and pathology, and cosmetic industry. The book will therefore appeal to researchers in the lipid oxidation field covering food, biological and medical areas.
Download or read book Emulsion based Systems for Delivery of Food Active Compounds written by Shahin Roohinejad and published by John Wiley & Sons. This book was released on 2018-06-18 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive text that offers a review of the delivery of food active compounds through emulsion-based systems Emulsion-based Systems for Delivery of Food Active Compounds is a comprehensive recourse that reviews the principles of emulsion-based systems formation, examines their characterization and explores their effective application as carriers for delivery of food active ingredients. The text also includes information on emulsion-based systems in regards to digestibility and health and safety challenges for use in food systems. Each chapter reviews specific emulsion-based systems (Pickering, multiple, multilayered, solid lipid nanoparticles, nanostructured lipid carriers and more) and explains their application for delivery of food active compounds used in food systems. In addition, the authors – noted experts in the field – review the biological fate, bioavailability and the health and safety challenges of using emulsion-based systems as carriers for delivery of food active compounds in food systems. This important resource: Offers a comprehensive text that includes detailed coverage of emulsion-based systems for the delivery of food active compounds Presents the most recent development in emulsion-based systems that are among the most widely-used delivery systems developed to control the release of food active compounds Includes a guide for industrial applications for example food and drug delivery is a key concern for the food and pharmaceutical industries Emulsion-based Systems for Delivery of Food Active Compounds is designed for food scientists as well as those working in the food, nutraceutical and pharmaceutical and beverage industries. The text offers a comprehensive review of the essential elements of emulsion-based systems for delivery of food active compounds.
Download or read book Oxidative Stability and Shelf Life of Foods Containing Oils and Fats written by Min Hu and published by Elsevier. This book was released on 2016-01-19 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oxidative Stability and Shelf Life of Foods Containing Oils and Fats focuses on food stability and shelf life, both important factors in the improvement and development of food products. This book, relevant for professionals in the food and pet food industries, presents an evaluation of methods for studies on the oxidative stability and shelf life of bulk oils/fats, fried oils and foods, food emulsions, dried foods, meat and meat products, and seafood in food and pet food. Focuses on the application of various evaluation methods to studies of oxidative stability and shelf life in oils and fats and oils and fats-containing foods in the food and pet food industries Discusses oxidative stability and shelf life of low-moisture (dry) food, including dry pet food Discusses lipid co-oxidation with protein because a number of food products contain both lipids and proteins Directed mainly toward readers working in the food and pet food industries
Download or read book Design and Optimization of Innovative Food Processing Techniques Assisted by Ultrasound written by Francisco J. Barba and published by Academic Press. This book was released on 2020-11-19 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design and Optimization of Innovative Food Processing Techniques Assisted by Ultrasound: Developing Healthier and Sustainable Food Products is a useful tool in understanding the innovative applications derived from the use of ultrasound technology. The book is a starting point for product development, covering technological, physicochemical and nutritional perspectives, as well as the reduction of food toxics and contaminants. Divided into three parts, sections cover ultrasound usage in obtaining functional foods, extracting bioactive compounds, the improvement of food quality, ultrasound use for the development of novel applications, and more. As the definitive resource in new innovative ultrasound-based emerging processes, this book is a necessity for food scientists and technologists, nutrition researchers, and those working in the food manufacturing industry. Explores how ultrasound treatment affects nutrients and bioactive compound retention Provides a useful tool in understanding the innovative applications derived from the use of ultrasound technology Shows how ultrasound serves as a tool of new ingredients production for the food concept of tomorrowa
Download or read book Chemical Changes During Processing and Storage of Foods written by Delia B. Rodriguez-Amaya and published by Academic Press. This book was released on 2020-11-25 with total page 721 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical Changes During Processing and Storage of Foods: Implications for Food Quality and Human Health presents a comprehensive and updated discussion of the major chemical changes occurring in foods during processing and storage, the mechanisms and influencing factors involved, and their effects on food quality, shelf-life, food safety, and health. Food components undergo chemical reactions and interactions that produce both positive and negative consequences. This book brings together classical and recent knowledge to deliver a deeper understanding of this topic so that desirable alterations can be enhanced and undesirable changes avoided or reduced. Chemical Changes During Processing and Storage of Foods provides researchers in the fields of food science, nutrition, public health, medical sciences, food security, biochemistry, pharmacy, chemistry, chemical engineering, and agronomy with a strong knowledge to support their endeavors to improve the food we consume. It will also benefit undergraduate and graduate students working on a variety of disciplines in food chemistry Offers a comprehensive overview of the major chemical changes that occur in foods at the molecular level and discusses the positive and negative effects on food quality and human health Describes the mechanisms of these chemical changes and the factors that impede or accelerate their occurrence Helps to solve daily industry problems such as loss of color and nutritional quality, alteration of texture, flavor deterioration or development of off-flavor, loss of nutrients and bioactive compounds or lowering of their bioefficacy, and possible formation of toxic compounds
