Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

In-vitro assessment of antimicrobial activity of ethanolic and water extracts of Mimosa pigra and Mimosa diplotricha.

Abstract

Mimosa pigra and Mimosa diplotricha are known as invasive plant and noxious weeds. These plants are spread throughout all areas of Thailand, causing problems in agriculture and transportation. This study aims to evaluate the antimicrobial activity of the water and ethanolic extracts of these plants. Stems, roots, and leaves crude extracts of M.pigra and M.diplotricha were investigated the antimicrobial activity by agar well diffusion. Seven different strains of gram-positive bacteria, gram-negative bacteria and yeast, i.e. Escherichia coli TISTR073, Pseudomanas aeruginosa TISTR781, Staphylococcus epidermidis TISTR518, Staphylococcus aureus TISTR2329 Propionibacterium acnes DMST 41283, Streptococcus mutans DMST14916 and Candida albicans TISTR5554 were used as test microbes. MIC and MBC of the crude extracts against those pathogens were also evaluated. The results revealed that the ethanolic extracts of both plant species had high antimicrobial activity against all test microbe and greater efficiency than the water extracts. The water extracts of M.diplotricha have inhibition activity against only S.aureus and S.epidermidis whereas the water extracts of M.pigra against only S.epidermidis. The MIC of the ethanolic extract of both plants varied between 1.56-100 mg/ml while MBC ranged from 6.25-50 mg/ml. The MIC and MBC of water extract ranged from 6.25-100 mg/ml and 25-100 mg/ml, respectively. Consequently, the ethanolic extracts of stem, root and leaves of M.pigra and M.diplotricha could be considered as a source of antimicrobial agents to be used as alternatives for a pharmaceutical application.