ISSN: 0973-7510
E-ISSN: 2581-690X
The antibacterial activity of organic solvent extracts from purple non sulphur bacteria (PNSB), isolated from shrimp culture ponds, showed inhibitory activity against the growth of, Vibrio spp., isolated from infected Tiger prawn (Penaeus monodon).The antibiotic activity was studied by Disk diffusion method and Broth tube dilution method. Amongst the purple non sulphur bacterial isolates Rhodobacter sphaeroides showed antagonism against Vibrio harveyi, Vibrio fischeri ,and Vibrio alginolyticus, with an minimum inhibitory concentration (MIC) range of 0.39- 6.25mg/ml. The chloroform extracts showed highest inhibitory zones than other solvents. These results reveal that extracts from the PNSB strains may hold novel bioactive compounds with effective antimicrobial properties.
Purple non sulphur bacteria, Antimicrobial activity, Shrimp pond, Vibrio harveyi
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