Abstract

From Mentha x piperita leaves, 16 free lipophilic flavonoid aglycones were isolated and identified. The variation of this flavonoid composition studied by the means of HPLC techniques from the youngest to the oldest leaves shows that the A- and B-ring O-methylation patterns of leaf pairs differ according to leaf age and would indicate the sequential activity of 4′- O- and 6- O-methyl-transferases.

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