4-Methylcoumarins as antioxidants: Scavenging of peroxyl radicals and inhibition of human low-density lipoprotein oxidation

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• 作者：Fausta Natella ; Bé ; né ; dicte Lorrain ; Ashok K. Prasad ; Virinder S. Parmar ; Luciano Saso ; Cristina Scaccini
• 关键词：4-methylcoumarins ; Antioxidant activity ; Low density lipoprotein ; Structure– ; activity relationship
• 刊名：Biochimie
• 出版年：2010
• 出版时间：September 2010
• 年：2010
• 卷：92
• 期：9
• 页码：1147-1152
• 全文大小：288 K

文摘

The antioxidant activity of eight synthetic 4-methylcoumarins was systematically studied. The antioxidant capacity was measured using: (i) a competition kinetic test, to measure the relative capacity to quench peroxyl radical; (ii) the in vitro oxidative modification of human low-density lipoprotein, initiated by AAPH or catalyzed by copper. In both models, the ortho-OH substitutes were found to be better antioxidant than the meta one. The most efficient antioxidant was the 7,8-dihydroxy-4-methylcoumarin and the corresponding diacetoxy-substituted was unexpectedly a good antioxidant. Finally, the presence of an ethoxycarbonylethyl substituent at the C-3 position increased the antioxidant capacity of both 7,8-dihydroxy-4-methylcoumarin and 7,8-diacetoxy-4-methylcoumarin.