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 nine plants were selected, namely, Bombax ceiba (Bombacaceae), Azadirachta indica (Meliaceae), Caesalpinia pitcherima (Caesalpiniaceae), Cassia fistula (Caesalpiniaceae), Clerodendrum viscasum (Verbenaceae), Andrographis paniculata (Acanthaceae), Albizia lebbeck (Mimosaceae), Artocarpus hirsutus (Moraceae), Cascabela thevetia (Apocynaceae) 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 nine plants tested, all showed antimicrobial activity against one or more species of micro organisms. The most active antimicrobial plants were Bombax ceiba, Cassia fistula and Artocarpus hirsutus. Hence the MICs of the crude extracts of these three plants were investigated by agar dilution method.
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