Mangiferin from Enicostemma littorale Blume with in silico and in vitro anti-inflammatory potential

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Abstract
The bioassay-guided fractionation of the extract of aerial parts of Enicostemma littorale resulted in two fractions 3 and 4 with moderate and potent antioxidant activity, respectively. The purification of fraction 3 gave swertiamarin (1), while the LCMS profile of fraction 4 unveiled the presence of another constituent along with swertiamarin. The extensive purification of fraction 4 led to the unusual isolation of mangiferin (2) from E. littorale. The uncommon isolation of mangiferin from E. littorale motivated us to conduct its in silico and in vitro screening as an anti-inflammatory agent. Both studies have proved mangiferin to be a promising anti-inflammatory molecule with a binding energy of -9.17 kcal/mol against Cyclooxygenase-2 protein and IC50 of 146.07 nanomolar. This study is the first report of the isolation of mangiferin, a xanthone glycoside from E. littorale.Communicated by Ramaswamy H. Sarma.

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