AI Article Synopsis
- Catechins, particularly epicatechin (EC) and epigallocatechin gallate (EGCG), are key compounds in green tea with various health benefits.
- EC is unstable in alkaline conditions when exposed to blue light, leading to the formation of superoxide anion radicals and new compounds via a photolytic process.
- In contrast, EGCG remains stable under the same conditions and can inhibit the oxidation of EC, suggesting that gallate-type catechins provide protection against light-induced degradation of non-gallate catechins.
Article Abstract
Catechins belonging to polyhydroxylated polyphenols are the primary compounds found in green tea. They are associated with many physiological properties. Epicatechin (EC) is a non-gallate-type catechin with four phenolic hydroxyl groups attached. The changes in EC treated with color light illumination in an alkaline condition were investigated by chromatographic and mass analyses in this study. In particular, the superoxide anion radical (O₂•) was investigated during the EC photolytic process. EC is unstable under blue light illumination in an alkaline solution. When EC was treated with blue light illumination in an alkaline solution, O₂• was found to occur via a photosensitive redox reaction. In addition, the generation of monomeric, dimeric, and trimeric compounds is investigated. On the other hand, epigallocatechin gallate (EGCG), which is a gallate-type catechin, is stable under blue light illumination in an alkaline solution. Adding EGCG, during the blue light illumination treatment of EC decreased photolytic formation, suggesting that gallate-type catechins can suppress the photosensitive oxidation of EC. Gallate-type catechins are formed via the esterification of non-gallate-type catechins and gallic acid (GA). The carbonyl group on the gallate moiety of gallate-type catechins appears to exhibit its effect on the stability against the photosensitive oxidation caused by blue light illumination.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6413119 | PMC |
| http://dx.doi.org/10.3390/molecules24040787 | DOI Listing |
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