M. De Vreese, E. Durand, B. Baréa, D. Morvan, C. Aleman, J. Lecomte, P. Villeneuve
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引用次数: 0
Abstract
Vitamin A is an essential micronutrient involved in vision, immunity, and growth. Despite its widespread use in food, cosmetic, and pharmaceutical products, vitamin A is highly prone to oxidation due to its conjugated double bonds, leading to reduced biological activity and efficacy. While various formulation strategies have been explored to enhance its stability, there is a notable lack of stability data and understanding of vitamin A oxidation, particularly in dispersed systems. This study aimed to evaluate the oxidative stability of vitamin A in model emulsions and identify how emulsion composition affects its degradation. Studying the influence of emulsion composition provides a better understanding of the possible oxidation pathways, including a nonradical pathway. An innovative method combining gentle emulsification via solvent displacement with real-time degradation monitoring was used. Retinyl palmitate (RP) demonstrated the highest stability compared to retinol (RO) and retinyl acetate (RA), due to structural and electronic factors. Among emulsifiers, the cationic type slightly improved stability by repelling positively charged pro-oxidant molecules. Three phenolic antioxidants, α-tocopherol (TOH), butylated hydroxytoluene (BHT), and carnosic acid (CA), improved stability, with TOH being the most effective. However, early-stage degradation could not be completely prevented, suggesting the existence of a predominant nonradical degradation pathway. The impact of iron (Fe2+) was minimal and attributed to the low hydroperoxide production, reinforcing the hypothesis of a nonradical initiation. Additionally, electrostatic repulsion in positively charged emulsions further limited iron's pro-oxidant effect. These findings enhance our understanding of vitamin A oxidation mechanisms and highlight potential stabilization strategies for its formulation in emulsified systems.
期刊介绍:
The Journal of the American Oil Chemists’ Society (JAOCS) is an international peer-reviewed journal that publishes significant original scientific research and technological advances on fats, oils, oilseed proteins, and related materials through original research articles, invited reviews, short communications, and letters to the editor. We seek to publish reports that will significantly advance scientific understanding through hypothesis driven research, innovations, and important new information pertaining to analysis, properties, processing, products, and applications of these food and industrial resources. Breakthroughs in food science and technology, biotechnology (including genomics, biomechanisms, biocatalysis and bioprocessing), and industrial products and applications are particularly appropriate.
JAOCS also considers reports on the lipid composition of new, unique, and traditional sources of lipids that definitively address a research hypothesis and advances scientific understanding. However, the genus and species of the source must be verified by appropriate means of classification. In addition, the GPS location of the harvested materials and seed or vegetative samples should be deposited in an accredited germplasm repository. Compositional data suitable for Original Research Articles must embody replicated estimate of tissue constituents, such as oil, protein, carbohydrate, fatty acid, phospholipid, tocopherol, sterol, and carotenoid compositions. Other components unique to the specific plant or animal source may be reported. Furthermore, lipid composition papers should incorporate elements of yeartoyear, environmental, and/ or cultivar variations through use of appropriate statistical analyses.