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Characterization of the coumarin/psoralen portion of the bergamot extracts by HPLC analysis. The percentage (w/w% ± SD) of citropten (5,7-dimethoxycoumarin), bergamottin (5-geranyloxypsoralen) and bergapten (5-methoxypsoralen) were determined for the three bergamot extracts by HPLC analysis.
