Abstract
Background: Withania somnifera (family solanaceae) is a well-investigated medicinal
plant which is also called Indian ginseng due to its wide spectrum of medicinal properties. The
contents and activity of the plant may vary depending on the habitat and part of the plant and the
solvent used for extraction. The present study deals with the comparative chemical analysis and in
vitro antioxidant activity of methanolic fruits extracts and its subfractions (in ethyl acetate, butanol
and water) of W. somnifera collected from two different geographical locations.
Methods: In the present study, Withania somnifera fruits were collected from two different
geographical locations (Uttarakhand and Rajasthan). The different fruit extracts were prepared and
studied for total phenolic contents and total flavone contents. The in vitro antioxidant activity was
assessed by DPPH free radical scavenging assay and peroxide scavenging assay.
Results: Methanol extract of W. somnifera Uttarakhand and ethyl acetate subfraction of W. somnifera
Rajasthan showed the highest amount of Total Phenolic Contents (TPC). In W. somnifera
Uttarakhand, ethyl acetate extract showed the highest amount of Total flavonoids while in W.
somnifera Rajasthan, methanol extract was found to be the richest in flavonoids. Methanolic extract
of W. somnifera Uttarakhand showed the highest free radical scavenging activity while in W.
somnifera Rajasthan, the highest antioxidant activity was shown by the methanolic extract followed
by butanolic extract, water extract and then ethyl acetate. In the peroxide scavenging assay of
antioxidant activity, water extract of W. somnifera Uttarakhand showed the highest activity, while in
W. somnifera Rajasthan, ethyl acetate extract showed highest scavenging activity.
Conclusion: It was concluded that the geographical location exerts a vital effect on the presence of
active constituents and also on the antioxidant potential of W. somnifera.
Keywords:
Phenolic contents, antioxidant activity, DPPH, geographical location, Uttarakhand, Rajasthan, Withania.
Graphical Abstract
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