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Bactericidal effect of Acacia nilotica: In Vitro antibacterial and time kill kinetic studies

Author: 
Amita Yadav, Manila Yadav, Sandeep Kumar and Jaya Prakash Yadav
Subject Area: 
Life Sciences
Abstract: 

The study aimed at comparing antibacterial potential of 3 polar and 3 non-polar organic solvent extracts of Acacia nilotica leaves against 9 reference bacterial strains and time kill kinetic study of ethyl acetate extract against S. typhi. Antibacterial activity was assessed against 9 standard bacterial reference strains viz. Shigella flexneri ATCC 12022, Enterococcus faecalis ATCC 29212, Staphylococcus aureus ATCC 259323, Proteus mirabilis ATCC 43071, Salmonella typhi ATCC 13311, Serratia marcescens ATCC 27137, Klebsiella pneumonia ATCC 700603, Escherichia coli ATCC 25922 and Pseudomonas aeruginosa ATCC 27853 by Agar well diffusion method at a concentration of 50mg/ml. MIC was calculated by modified 96 well microtitre plate assay. Time kill kinetic study against S. typhi was performed at ½ x MIC, MIC and 2 x MIC concentrations. Polar solvent extracts were more active against all test strains. Ethyl acetate extract was most active. Maximum activity was against S. typhi with a zone of inhibition of 25 mm. MIC values ranged from 0.39 mg/ml to 12.5 mg/ml for different test strains. Maximum reduction in CFU/ml was achieved at 8 hour of incubation at MIC and 2 x MIC concentrations. So we can conclude that A. nilotica leaves can be a potent source of new antibacterial agents for therapeutic applications.

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