Searches for moieties with antimicrobial activity are frequent and medicinal plants have been considered interesting, since they are frequently used in popular medicine as remedies for many infectious diseases. There are number of medicinal plants available in Tumkur district of Peninsula Craton, out of which ten plants were selected, namely, Abutilon indicum (Malvaceae), Wrightia tinctoria (Apocynaceae), Tectona grandis (Verbenaceae), Nerium indicum (Apocynaceae), Achyranthes aspera (Amaranthaceae), Vitex negundo (Verbenaceae), Butea monosperma (Fabaceae), Bauhinia purpurea (Caesalpiniaceae), Caesalpinia bonducella (Caesalpiniaceae), Ocimum basilicum (Lamiaceae), which are traditionally used in the treatment of various skin disorders. In the present study antimicrobial activity of selected plants were carried out against seven microorganisms Escherichia coli, Salmonella typhi, Bacillus subtilis, Bacillus cereus, Staphylococcus aureus, Aspergillus niger and Rhizopus, which are known to cause different skin infections. The tests were carried out using spread plate method at 200 mg/10 ml concentration level of the crude methanol extracts. Of the ten plants tested, all showed antimicrobial activity against one or more species of micro organisms. The most active antimicrobial plants were Tectona grandis, Caesalpinia bonducella, and Butea monosperma. Hence the MICs of the crude extracts of these three plants were investigated by agar dilution method.
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