ABSTRACT:Three additional flavonoids such as 5,7,4′-trihydroxy-3,8,3′-trimethoxy flavonol (1), 5,7-dihydroxyflavone (chrysin, 2) and 5,6,7-trihydroxyflavone (baicalein, 3) were obtained from the methanol extract of whole plant of Polygonum viscosum. The structure of the isolated compounds was established exclusively by ultraviolet (UV) spectroscopy, mass spectrometry (MS) and a series of Nuclear Magnetic Resonance (NMR) analysis.
Repeated chromatographic separation and purification of the n-hexane-ethyl acetate (3:1) extract of aerial parts of Polygonum viscosum provided a flavonoid-ternatin (1) and two steroids-stigmasterol (2) and stigmasta-4,22-dien-3-one (3). The structure of these compounds were determined on the basis of extensive NMR and other spectroscopic techniques and comparison with published data. The identity of steroids 2 and 3 was confirmed by co-TLC with authentic sample.
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