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      Nanoemulsions as delivery systems for lipophilic nutraceuticals: strategies for improving their formulation, stability, functionality and bioavailability

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          Abstract

          The food and beverage industry often need to encapsulate hydrophobic functional ingredients in their products, including colors, flavors, lipids, nutraceuticals preservatives, and vitamins. Encapsulation can improve the handling, water-dispersibility, chemically stability, and efficacy of these functional ingredients. In this review article, we focus on the design of nanoemulsion-based delivery systems to encapsulate, protect, and deliver non-polar bioactive agents, such as vitamin A, D and E, β-carotene, lycopene, lutein, curcumin, resveratrol, and coenzyme Q10. Initially, the challenges associated with incorporating these different bioactives into foods are highlighted. The relative merits and drawbacks of different nanoemulsion fabrication methods are then discussed. Finally, examples of the application of nanoemulsions for improving the stability and bioavailability of various kinds of hydrophobic vitamins and nutraceuticals are provided.

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          Nanoemulsions: formation, properties and applications.

          Nanoemulsions are kinetically stable liquid-in-liquid dispersions with droplet sizes on the order of 100 nm. Their small size leads to useful properties such as high surface area per unit volume, robust stability, optically transparent appearance, and tunable rheology. Nanoemulsions are finding application in diverse areas such as drug delivery, food, cosmetics, pharmaceuticals, and material synthesis. Additionally, they serve as model systems to understand nanoscale colloidal dispersions. High and low energy methods are used to prepare nanoemulsions, including high pressure homogenization, ultrasonication, phase inversion temperature and emulsion inversion point, as well as recently developed approaches such as bubble bursting method. In this review article, we summarize the major methods to prepare nanoemulsions, theories to predict droplet size, physical conditions and chemical additives which affect droplet stability, and recent applications.
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            Plant foods and herbal sources of resveratrol.

            Stilbenes, in particular trans-resveratrol and its glucoside, are widely reported to be beneficial to health, having been shown to possess antioxidative, anticarcinogenic, and antitumor properties. Major dietary sources include grapes, wine, peanuts, and soy; however, they can also be introduced into the diet through Itadori tea, which has long been used in Japan and China as a traditional herbal remedy for heart disease and strokes. Analysis of grapes, peanuts, and Itadori tea shows that they contain mainly trans-resveratrol glucoside. In contrast, red wines are primarily a source of the aglycones cis- and trans-resveratrol. While peanuts and grapes contain low levels of the stilbenes, Itadori tea and red wine both supply relatively high concentrations of resveratrol. For people who do not consume alcohol, Itadori tea may be a suitable substitute for red wine. However, further study on the potential biological effects of other endogenous compounds in Itadori tea is required and there is also a need for more information on the absorption and in vivo biomedical actions of free and conjugated resveratrol.
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              Factors influencing the chemical stability of carotenoids in foods.

              In recent years, a number of studies have produced evidence to suggest that consuming carotenoids may provide a variety of health benefits including a reduced incidence of a number of cancers, reduced risk of cardiovascular disease, and improved eye health. Evolving evidence on the health benefits of several carotenoids has sparked interest in incorporating more carotenoids into functional food products. Unfortunately, the same structural attributes of carotenoids that are thought to impart health benefits also make these compounds highly susceptible to oxidation. Given the susceptibility of carotenoids to degradation, particularly once they have been extracted from biological tissues, it is important to understand the major mechanisms of oxidation in order to design delivery systems that protect these compounds when they are used as functional food ingredients. This article reviews current understanding of the oxidation mechanisms by which carotenoids are degraded, including pathways induced by heat, light, oxygen, acid, transition metal, or interactions with radical species. In addition, several carotenoid delivery systems are evaluated for their potential to decrease carotenoid degradation in functional food products.
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                Author and article information

                Contributors
                mcclements@foodsci.umass.edu
                Journal
                Food Sci Biotechnol
                Food Sci. Biotechnol
                Food Science and Biotechnology
                Springer Singapore (Singapore )
                1226-7708
                2092-6456
                14 July 2020
                14 July 2020
                February 2020
                : 29
                : 2
                : 149-168
                Affiliations
                [1 ]GRID grid.412485.e, ISNI 0000 0000 9760 4919, Department of Food Science and Technology, , Seoul National University of Science and Technology, ; Seoul, 01811 Republic of Korea
                [2 ]GRID grid.412485.e, ISNI 0000 0000 9760 4919, Departement of Interdisciplinary Bio IT Materials, , Seoul National University of Science and Technology, ; Seoul, 01811 Republic of Korea
                [3 ]GRID grid.266683.f, ISNI 0000 0001 2184 9220, Department of Food Science, , University of Massachusetts, ; Amherst, MA 01003 USA
                [4 ]GRID grid.413072.3, ISNI 0000 0001 2229 7034, Department of Food Science and Bioengineering, , Zhejiang Gongshang University, ; Hangzhou, 310018 Zhejiang China
                Author information
                http://orcid.org/0000-0002-9016-1291
                Article
                731
                10.1007/s10068-019-00731-4
                6992823
                32064124
                813d8392-d053-45e6-87dc-9495dcaf511d
                © The Author(s) 2020, corrected publication 2020

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.

                The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.

                To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 13 October 2019
                : 11 December 2019
                : 26 December 2019
                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/100005825, National Institute of Food and Agriculture;
                Award ID: 2016-08782
                Award Recipient :
                Funded by: FundRef http://dx.doi.org/10.13039/501100002701, Ministry of Education;
                Award ID: NRF-2016R1D1A1B03930215
                Award Recipient :
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                Article
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                © The Korean Society of Food Science and Technology 2020

                nanoemulsions,bioavailability,bioaccessibility,stability,delivery systems,encapsulation

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