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Seaweeds of the intertidal regions are a rich source of surface associated bacteria and are potential source of antimicrobial molecules. In the present study, 77 epiphytic isolates from eight different algae collected from Little Andaman were enumerated. On testing for their antimicrobial activities against certain pathogens twelve isolates showed positive and six of them showed significant antimicrobial inhibition zone against  Shigella boydii  type 1,  Shigella flexneri  type 2a,  Shigella dysenteriae  type 5, Enterotoxigenic  Escherichia coli  O115, Enteropathogenic  E. coli  serotype O114,  Vibrio cholera ; O1 Ogawa , Aeromonas hydrophila, Klebsiella pneumoniae, Staphylococcus aureus.  Based on the activity these six isolates (G1C, G2C, G3C, UK, UVAD, and Tor1) were identified by 16S rRNA gene sequence and were found to belong to the phyla Firmicutes and Proteobacteria. Purified antimicrobial compounds obtained from these isolates were identified by GC-MS. Furan derivatives were identified from G2C  Pseudomonas stutzeri  KJ849834, UVAD  Alcanivorax dieselolei  KJ849833, UK  Vibrio  sp. KJ849837, Tor1  Exiguobacterium profundum  KJ849838. While 2-Pyrrolidinone, Phenol, 2, 4-bis (1, 1-dimethylethyl) were from G3C  Vibrio owensii  KJ849836 and (1-Allylcyclopropyl) methanol from the extracts of G1C  Bacillus  sp. KJ849835. The results of the present study shows that these six potent isolates isolated from the seaweeds are found to be a source of antimicrobial compounds.

Antimicrobial Potential of Epiphytic Bacteria Associated With Seaweeds of Little Andaman, India