Journal of Natural Remedies

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Objective: Estimation of quercetin content of Eupatorium glandulosum and Coolebroke oppositifolia by HPLC. Materials and methods: The presence of quercetin (3, 3I, 4I, 5, 7 - pentahydroxyflavone) present in the leaves of Eupatorium glandulosum (Family- Asteraceae) and Coolebroke oppositifolia (Family : Labiatae) was quantitatively estimated by high performance liquid chromatography using reversed phase (RP-HPLC) with stepwise gradient elution on a RP C18 column. A two step elution with: acetonitrile- water- phosphoric acid (85%): from 16-83-1 to 32-67-1(v/v) was made. Results: The leaf extracts of E. glandulosum and C. oppositifolia contained 4.96 and 2.10 % and the respective powdered leaf contained 0.19 % (w/w) and 0.09 % (w/w) of quercetin . Conclusion: The method developed is useful to obtain quantitative values for quercetin present in these plant species, which may be useful for standardization of the same.

Keywords

Eupatorium Glandulosum, Coolebroke Oppositifolia, Flavonoid, Quercetin, RP-HPLC
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