Antimicrobial activity from lansium seeds extract (Ageratum domestica Pelleg)
2001
Wassana Chatdumrong
Lansium is an economic fruit of Thailand possesses a favorable taste. In the past, people used lansium as a medicinal herb to treat some diseases. The present study is therefore aimed to investigate the antimicrobial activity of lansium seeds extract (LSE). Antimicrobial activity of 5 percent LSE crude extract was tested against 17 microbial strains. Eight strains of gram positive bacteria, six strains of gram negative bacteria and three fungal genera i.e. Aspergillus sp., Mucor sp. and Rhizopus sp. Results indicate that Bacillus cereus, B. subtilis, B. megaterium, B. sphaericus, Staphylococcus epidermidis, Sarcina lutea and Proteus morganii were inhibited whereas the three fungal genera were not. Inhibition was shown to depend on LSE concentration and 3 percent LSE was observed as the minimum concentration that indicated inhibitory effect. Moreover, the effect depended on the concentration of microorganisms. Study of antimicrobial activity using 7 percent LSE crude extract revealed that Bacillus sphaericus and Staphylococcus epidermidis were the most sensitive strains with the clear zone of 2.20 and 2.10 cm in diameter, respectively whereas Bacillus subtilis was the most resistant strain with the clear zone of 1.00 cm in diameter.
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