作者:Stefano Dall’Acqua、Giorgia Miolo、Gabbriella Innocenti、Sergio Caffieri
DOI:10.3390/molecules17088898
日期:——
The photostability of quercetin in alcoholic solutions was studied. Both UVA and UVB light induced degradation of quercetin, yielding a single product 1 deriving from oxidation and addition of an alcohol molecule to the 2,3 double bond. The same mechanism operated when quercetin was dissolved in alkaline solutions, and again a product 2 due to oxidation and addition of water was characterized. Comparison with quercetin analogs confirmed that, despite the presence of five hydroxy groups in quercetin, those in positions 3, 3′, and 4′ are mainly involved in the antioxidant activity of the compound , as well as in its photolability.
研究了槲皮素在酒精溶液中的光稳定性。UVA 和 UVB 光都会诱导槲皮素降解,产生一种单一的产物 1,该产物来自于氧化和 2,3 双键上的醇分子的加成。当槲皮素溶解在碱性溶液中时,也会产生同样的机理,同样会产生一种由氧化和加水产生的产物 2。与槲皮素类似物的比较证实,尽管槲皮素中存在五个羟基,但位于 3、3′ 和 4′位的羟基主要参与了该化合物的抗氧化活性及其光溶性。