Phytochemistry

O-Methylation of flavonoids by cell-free extracts of calamondin orange

G Brunet, RK Ibrahim

Index: Brunet, Gunter; Ibrahim, Ragai K. Phytochemistry (Elsevier), 1980 , vol. 19, p. 741 - 746

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Citation Number: 23

Abstract

Abstract Cell-free extracts of calamondin orange (Citrus mitis) catalysed the O-methylation of almost all hydroxyls of a number of flavonoids, indicating the existence in citrus tissues of ortho, meta, para and 3-O-methyltransferases. The latter, hitherto unreported enzyme, catalysed the formation of 3-O-methyl ethers of galangin and quercetin. The stepwise O- methylation of a number of compounds, especially quercetin and quercetagetin, tends to ...