Plants have been used as major source of active compounds with medicinal importance since human civilization. These naturally occurring pharmacologically active agents have least or no toxicity to the host. The antibacterial activity of extracts (water, acetone and methanol) from six indigenous Indian plants: Acacia nilotica (Fabaceae), Albizia saman (Fabaceae), Azadirachta indica (Meliaceae), Carica papaya (Caricaceae), Cymbopogon citratus (Poaceae) and Mangifera indica (Anacardiaceae) were determined against the pathogenic bacteria (Staphylococcus aureus: ATCC 25923; Escherichia coli: ATCC 25922 and Klebsiella pneumonia: ATCC 700603). The antimicrobial study was carried out by the gel diffusion method and the results show that as compared to aqueous extract, methanolic and acetone extracts were more effective. Of all the studied plants, the methanolic extract of A. saman leaves inhibited the growth of all the three test organisms.
Key words: Antibacterial activity, pathogenic bacteria, indigenous plants.
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