Effect of thermal and non thermal processing technologies on the bioactive content of exotic fruits and their products: Review of recent advances
TL;DR: This review summarizes the recent application of both thermal and non-thermal processing technologies on bioactive content of exotic fruits and their products and discusses the impact of processing conditions on the stability of bioactive compounds in exotic fruits.
About: This article is published in Food Research International.The article was published on 2011-08-01. It has received 430 citations till now.
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TL;DR: In this article, the effect of different dry drying and grinding methods on physicochemical and functional properties of the final products is reviewed, and some of the innovative concepts as well as approaches to alleviate the abovementioned changes are discussed.
297 citations
TL;DR: In this paper, the authors present non-thermal technologies applications and its mechanism in food industry in recently, and explore the potential application prospects of combining nonthermal treatments applied in food Industry because it not only could overcomes the drawback of single technology, but also can enhances the processing efficiency at lower treatment intensity.
Abstract: In recent years, consumers have been demanding convenient and healthy foods which have ‘fresh-like’ characteristics while still being safe and a long shelf-life. These requirements are hard to achieve using existing traditional thermal food processing technologies and the innovative new food process and preservation technologies based on thermal processing systems are needed. However, non-thermal technologies in food processing do not generate high temperature and use short treatment times. This means that the nutritional components of foodstuffs are better retained, and the sensory properties of foods are less changed compared with traditional thermal processing. The aim of this review was to present non-thermal technologies applications and its mechanism in food industry in recently, and to explore the potential application prospects of combining non-thermal treatments applied in food industry because it not only could overcomes the drawback of single technology, but also can enhances the processing efficiency at lower treatment intensity.
219 citations
TL;DR: In this paper, a review of current and new insights in the recovery of high-added value compounds from wastes and by-products generated during the olive oil production process is discussed.
Abstract: Background A large amount of wastes and by-products are generated during olive oil production process. Traditionally, these products have been considered as a problem. However, they constitute a great source of high-added value compounds, which have the potential to be used as food additives and/or nutraceuticals. Therefore, valorization of wastes and by-products from food industry kills two birds with one stone and addresses both the use of waste and by-products and societal health, thus greatly contributing for a sustainable food chain from an environmental and economical point of view. Scope and approach In the present review, current and new insights in the recovery of high-added value compounds from wastes and by-products generated during olive oil production process will be discussed. Several conventional (solvent, heat, grinding) and non-conventional methodologies (ultrasounds, microwaves, sub- and supercritical fluid extractions, pressurized liquid extraction, pulsed electric fields and high voltage electrical discharges) have been investigated for the recovery of high-added value compounds (polyphenols, fatty acids, coloring pigments (chlorophylls and carotenoids), tocopherols, phytosterols, squalene, volatile and aromatic compounds) from wastes and by-products generated during olive oil production process. Key findings and conclusions Non-conventional technologies can constitute a promising tool to recover high-added value compounds from olive oil wastes and by-products. However, the content of these valuable compounds can vary greatly depending on the matrix and the efficiency in the recovery of these compounds is highly dependent of the technology used for extraction.
211 citations
TL;DR: The potential of microencapsulation to protect bioactive compounds ensuring their bioavailability is shown, but further studies are required, considering both its applicability and incentives by regulatory agencies.
Abstract: Health issues are an emerging concern to the world population, and therefore the food industry is searching for novel food products containing health-promoting bioactive compounds, with little or no synthetic ingredients. However, there are some challenges in the development of functional foods, particularly in which the direct use of some bioactives is involved. They can show problems of instability, react with other food matrix ingredients or present strong odour and/or flavours. In this context, microencapsulation emerges as a potential approach to overcome these problems and, additionally, to provide controlled or targeted delivery or release. This work intends to contribute to the field of functional food development by performing a comprehensive review on the microencapsulation methods and materials, the bioactives used (extracts and isolated compounds) and the final application development. Although several studies dealing with microencapsulation of bioactives exist, they are mainly focused on the process development and the majority lack proof of concept for final applications. These factors, together with the lack of regulation, in Europe and in the United States, delay the development of new functional foods and, consequently, their market entry. In conclusion, the potential of microencapsulation to protect bioactive compounds ensuring their bioavailability is shown, but further studies are required, considering both its applicability and incentives by regulatory agencies.
209 citations
Cites background from "Effect of thermal and non thermal p..."
...…as tocopherols, phenolic compounds and microelements, and after hydrothermal processing, the concentration of these molecules severely decreased.10 Rawson et al.11 described major losses of bioactive compounds after processing exotic fruits such as mangoes, açaí, pineapple and pitanga, subjecting…...
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TL;DR: The results obtained support the use of sonication to improve the quality of Chokanan mango juice along with safety standard as an alternative to thermal treatment.
191 citations
References
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01 Jan 1970
TL;DR: This fifth edition of Modern Food Microbiology places special emphasis on foodborne microorganisms, as the previous four editions attempted to do, and contains material that goes beyond what normally is covered in a one-term course.
Abstract: This fifth edition of Modern Food Microbiology places special emphasis on foodborne microorganisms, as the previous four editions attempted to do. A good understanding of the basic biology offoodborne organisms is more critical for food scientists now than in previous decades. With so many microbiologists in the 1990s devoting their attention to genes and molecules, one objective of this text is to provide a work that places emphasis on entire microbial cells as well as their genes and molecules. For textbook usage, this edition is best suited for a second or subsequent course in microbiology. Although organic chemistry is a desirable prerequisite, those with a good grasp of general biology and chemistry should not find this book difficult. In addition to its use as a course text, this edition, like the previous, contains material that goes beyond what normally is covered in a one-term course. For use as a food microbiology text, suggested starting points are the sections in Chapter 2 that deal with the sources and types of microorganisms in foods followed by the principles outlined in Chapter 3. The food product chapters (Chaps. 4-9) may be covered to the extent that one wishes, but the principles from Chapters 2 and 3 should be stressed during this coverage. A somewhat logical next step would be food preservation methods as outlined in Chapters 13-17 where again the principles from Chapter 3 come into play.
2,505 citations
TL;DR: The content of vitamin C in fruits and vegetables can be influenced by various factors such as genotypic differences, pre-harvest climatic conditions and cultural practices, maturity and harvesting methods, and postharvest handling procedures.
2,153 citations
TL;DR: In this paper, the use of ultrasonic assisted extraction (UAE) for food and allied industries is discussed, including the potential for modification of plant cell material to provide improved bioavailability of micro-nutrients while retaining the natural-like quality.
Abstract: Ultrasound assisted extraction (UAE) process enhancement for food and allied industries are reported in this review. This includes herbal, oil, protein and bioactives from plant and animal materials (e.g. polyphenolics, anthocyanins, aromatic compounds, polysaccharides and functional compounds) with increased yield of extracted components, increased rate of extraction, achieving reduction in extraction time and higher processing throughput. Ultrasound can enhance existing extraction processes and enable new commercial extraction opportunities and processes. New UAE processing approaches have been proposed, including, (a) the potential for modification of plant cell material to provide improved bioavailability of micro-nutrients while retaining the natural-like quality, (b) simultaneous extraction and encapsulation, (c) quenching of the radical sonochemistry especially in aqueous systems to avoid degradation of bioactives and (d) potential use of the radical sonochemistry to achieve targeted hydroxylation of polyphenolics and carotenoids to increase bioactivity. Industrial relevance The application of ultrasonic assisted extraction (UAE) in food processing technology is of interest for enhancing extraction of components from plant and animal materials. This review shows that UAE technology can potentially enhance extraction of components such as polyphenolics, anthocyanins, aromatic compounds, polysaccharides, oils and functional compounds when used as a pre-treatment step in a unit process. The higher yield obtained in these UAE processes are of major interest from an industrial point of view, since the technology is an “add on” step to the existing process with minimum alteration, application in aqueous extraction where organic solvents can be replaced with generally recognised as safe (GRAS) solvents, reduction in solvent usage, and shortening the extraction time. The use of ultrasonic for extraction purposes in high-cost raw materials is an economical alternative to traditional extraction processes, which is an industry demand for a sustainable development.
1,169 citations
TL;DR: In this paper, the mechanisms and kinetics of anthocyanin degradation during heat treatment are investigated based on current findings, which can have a dramatic impact on colour quality and may also affect nutritional properties.
Abstract: Anthocyanins are the most abundant flavonoid constituents of fruits and vegetables. The conjugated bonds in their structures, which absorb light at about 500 nm, are the basis for the red, blue and purple colours of fruits, vegetables and their products. Anthocyanin pigments readily degrade during thermal processing which can have a dramatic impact on colour quality and may also affect nutritional properties. This review attempts to summarize some important aspects of anthocyanin degradation during thermal processing. Conclusions regarding the mechanisms and kinetics of anthocyanin degradation during heat treatment are postulated based on current findings.
969 citations
TL;DR: Determination of the degree of lycopene isomerization during processing would provide a measure of the potential health benefits of tomato-based foods, and further research on the bioavalability, pharmacology, biochemistry, and physiology must be done to reveal the mechanism of lyCopene in human diet.
Abstract: Lycopene is the pigment principally responsible for the characteristic deep-red color of ripe tomato fruits and tomato products. It has attracted attention due to its biological and physicochemical properties, especially related to its effects as a natural antioxidant. Although it has no provitamin A activity, lycopene does exhibit a physical quenching rate constant with singlet oxygen almost twice as high as that of beta-carotene. This makes its presence in the diet of considerable interest. Increasing clinical evidence supports the role of lycopene as a micronutrient with important health benefits, because it appears to provide protection against a broad range of epithelial cancers. Tomatoes and related tomato products are the major source of lycopene compounds, and are also considered an important source of carotenoids in the human diet. Undesirable degradation of lycopene not only affects the sensory quality of the final products, but also the health benefit of tomato-based foods for the human body. Lycopene in fresh tomato fruits occurs essentially in the all-trans configuration. The main causes of tomato lycopene degradation during processing are isomerization and oxidation. Isomerization converts all-trans isomers to cis-isomers due to additional energy input and results in an unstable, energy-rich station. Determination of the degree of lycopene isomerization during processing would provide a measure of the potential health benefits of tomato-based foods. Thermal processing (bleaching, retorting, and freezing processes) generally cause some loss of lycopene in tomato-based foods. Heat induces isomerization of the all-trans to cis forms. The cis-isomers increase with temperature and processing time. In general, dehydrated and powdered tomatoes have poor lycopene stability unless carefully processed and promptly placed in a hermetically sealed and inert atmosphere for storage. A significant increase in the cis-isomers with a simultaneous decrease in the all-trans isomers can be observed in the dehydrated tomato samples using the different dehydration methods. Frozen foods and heat-sterilized foods exhibit excellent lycopene stability throughout their normal temperature storage shelf life. Lycopene bioavailability (absorption) can be influenced by many factors. The bioavailability of cis-isomers in food is higher than that of all-trans isomers. Lycopene bioavailability in processed tomato products is higher than in unprocessed fresh tomatoes. The composition and structure of the food also have an impact on the bioavailability of lycopene and may affect the release of lycopene from the tomato tissue matrix. Food processing may improve lycopene bioavailability by breaking down cell walls, which weakens the bonding forces between lycopene and tissue matrix, thus making lycopene more accessible and enhancing the cis-isomerization. More information on lycopene bioavailability, however, is needed. The pharmacokinetic properties of lycopene remain particularly poorly understood. Further research on the bioavalability, pharmacology, biochemistry, and physiology must be done to reveal the mechanism of lycopene in human diet, and the in vivo metabolism of lycopene. Consumer demand for healthy food products provides an opportunity to develop lycopene-rich food as new functional foods, as well as food-grade and pharmaceutical-grade lycopene as new nutraceutical products. An industrial scale, environmentally friendly lycopene extraction and purification procedure with minimal loss of bioactivities is highly desirable for the foods, feed, cosmetic, and pharmaceutical industries. High-quality lycopene products that meet food safety regulations will offer potential benefits to the food industry.
948 citations