Production of biosurfactant by Nocardia otitidiscaviarum and its role in biodegradation of crude oil

Nocardia otitidiscaviarum microbial type cultural collection 6471 isolated from oil contaminated Alang India seawater was examined for production of surface active compound. Isolate shows halos and α-heamolysis on cetyl trimethyl ammonium bromide and blood agar respectively indicating the production of biosurfactant. Biosurfactant was extracted by precipitation and was partially purified. Partially purified product was characterized by thin layer chromatography and Infra-red spectroscopy and was identified as glycolipid. Sugar present in glycolipid was rhamnose and hence, biosurfactant was quantified as rhamnose equivalent. Role of cell-surface hydrophobicity and emulsification activity in correlation with biosurfactant production was examined. Correlation between biosurfactant production, growth and crude oil degradation was also examined and showed positive correlation at significant level 0.001 and 0.01 respectively. Thus, this is a first report on a marine strain of Nocardia otitidiscaviarum microbial type culture collection 6471, which can be a potential candidate for restoration of oil contaminated marine environment.

Keywords
Bioavailability; Bioremediation; Cell surface hydrophobicity; Emulsification; Glycolipids