SCREENING OF ANTIBACTERIAL ACTIVITY OF MENTHA PIPERITA L.A. MAHALAKSHMI PRIYA, M. IVIANIKANDAN, G. KALAISELVI, P. ARUN, P. CHINNASWAMY AND K. SELVAMAbstract The antibacterial effect of Mentha piperita extract was tested against various bacteria viz, Escherich ia.coli , Klebsiella pneumonzae, Proteus vulgaris,Psuedomonas aeruginosa,Salmonella typlzi and Staphylococcus aureus using agar diffusion method. The raw extract, ethanol, ethyl acetate and chloroform extracts of the leaves of peppermint were tested against these organisms for its antimicrobial activity. Among the four types of extracts, ethyl acetate extract showed the highest antibacterial activity. It was active against four organisms namely E.coli, K..pneumoniae, P.aeruginosa and S.auretts. The chloroform extract produced the highest zone of clearance against P.vulgaris with a diameter of about 1.8 mm. The ethanol extract produced zone of clearance against E.coli as well as S. aureus while the raw extract produced a zone of clearance only against S. aureus.
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