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Helicteres hirsuta Lour., particularly its stems and leaves have been used in Vietnamese traditional medicine to cure furuncles, dysentery, measles and flu. In this study, we examined biological activities of 5 fractions from methanol extract of H. hirsuta roots. The results showed that ethyl acetate fraction has the highest content of phenolic and flavonoid compounds (220.9 ± 15.67 mg GAE, gallic acid equivalents /g dry weight and 23.03 ± 0.97 mg QE, quercetin equivalents /g dry weight, respectively). Fractions from H. hirsuta roots exhibited antioxidant, an-tibacterial and anticancer activities. Ethyl acetate fraction showed the strongest antioxidant activi-ty through 1,1diphenyl-2-picrylhydrazyl (DPPH) scavenging capacity (half-maximal inhibitory concentration, IC50 value of 0.117 ± 0.023 mg/ml). Ethyl acetate fraction of roots also showed the strongest reducing power (0.071 ± 0.009 mg/ml) and cytotoxicity on human KB cell lines (IC50= 3.23 μg/ml). Besides, fractions from H. hirsuta roots had high inhibitory activity against Gram-positive bacteria namely Staphylococcus aureus and Lactobacillus fermentum. The results suggest potential exploitation of bioactive compounds from H. hirsuta roots especially ethyl acetate frac-tion and its application in medicine and pharmacy. This is the first report on second metabolite composition and biological activities of H. hirsuta roots. |
