Abstract
Antibacterial properties of turmeric, Curcuma longa were tested against virulent pathogenic isolates of Aeromonas hydrophila, Pseudomonas aeruginosa, P. fluorescens, Edwardsiella tarda, Escherichia coli and Flavobacterium columnare. Aqueous and ethanolic extracts of C. longa were tried for the antibacterial study. Both the extracts showed moderate to high sensitivity against A. hydrophila (10-14 mm), P. aeruginosa (12-16 mm), P. fluorescens (8-15 mm), E. coli (9-15 mm), E. tarda (10-12 mm) and F. columnare (12-14 mm), respectively, as measured by zone of inhibition test. On silica gel column chromatography, ethanolic extract of C. longa were fractionated. Out of 10 fractions collected, 4 fractions showed antibacterial properties against these pathogenic bacteria. Both the aqueous and ethanolic extracts of turmeric can serve as therapeutics for controlling bacterial infection in aquaculture practice.
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