Abstract

Antimicrobial activities of some Vietnamese medicinal plant extracts including Premna integrifolia L, Terminalia nigrovenulosa, Pseuderanthemum palatiferum, Streptocaulon juventas, Eclipta alba, and Solanum hainanense were investigated. Almost all extracts had antimicrobial effects on the tested microorganisms, including Bacillus subtilis,Staphylococcus aureus, Lactobacillus brevis, Escherichia coli, Pseudomonas aeruginose,Candida albicans, Saccharomyces cerevisiae, Aspergillus niger, and Penicillium cyclopium. Of these extracts, the methanol extracts exhibited higher antimicrobial activity levels compared to that of other extracts. The greatest activity was obtained with T. nigrovenulosamethanol extracts, followed by the extracts of P. nigrovenulosa and S. juventas. The results indicate that the methanol extracts of T. nigrovenulosa, S. juventas, and P. nigrovenulosahave significant potential for use as traditional therapy. Further study may lead to a novel antimicrobial compound.

Key words: Medicinal plant, antimicrobial activity, minimum inhibitory concentration (MIC).