Abstract
Folk medicine was used to treat some common diseases such as diarrhea, inflammation, wound healing … by ethnic minorities at Bidoup – Nui Ba National Park, Lam Dong province. However, the usage of medicinal plants has been mainly based on experiences and this study aimed to evaluate antibacterial activity of the medicinal plants as a basis for further studies. Night water extracted folk medicinal plants that ethnic minorities used to treat diarrhea were tested for antibacterial activity against 16 indicator bacteria by well diffusion agar. These results showed that the recovery performance of the extract from folk medicinal plants was high (11,99% - 29,52%). The result of antibacterial activity showed that 5/9 water extracts had antibacterial activity. The extract from xidra nguon (Medinilla septentrionalis) had the highest antibacterial activity (against 16/16 indicator bacteria) with inhibition diameter zone from 9,3 mm to 11,0 mm; 4/9 water extracts had weak activity and 4/9 extracts had no antibacterial activity. The preliminary phytochemical screening of extracts that possessed the highest antibacterial activity showed the presence of some bioactive compounds such as alkaloids, flavonoids and tannins. The results of this study showed that not all folk medicinal plant that was extracted by water are highly active, so there should be more intensive research.
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