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Abstract

This study was carried out to determine the antimicrobial activity of seven herbal extracts (Ricinus communis L., Hedyotis corymbosa L., Vernonia amygdalina del., Moringa oleifera, Callisia fragrans, Acanthus ilicifolius L. and Wedelia calendulacea (L) Less) which were collected in the Mekong Delta. Antimicrobial activity, minimum inhibitory concentration (MIC), and minimum bactericidal concentration (MBC) of the seven herbal extracts were screened for two common shrimp pathogens (Vibrio harveyi and Vibrio parahaemolyticus). The results showed that (i) seven herbal extracts have different antimicrobial activity; the extract of R. communis showed the highest diameter of the inhibition zone from 17 -18 mm, followed by the extracts of V. amygdalina del., M. oleifera, A. ilicifolius L. and W. calendulacea (L) Less. with the inhibition zone range of 10 - 11 mm. Similarly, the smallest inhibition zone was recorded for the extracts of H. corymbosa L. and C. fragrans) at 7 and 8 mm, respectively; (ii) The results suggested that were also found to be effective at the extract of R. communis L for against V. harveyi, V. parahaemolyticus, with MIC and MBC values were 1.25 mg ml-1 and 2.5 mg ml-1; 2.5 mg ml-1 và 5.0 mg ml-1, respectively.