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A potential biosurfactant producing isolate was identified as  Bacillus aryabhattai  strain ZDY2. Biosurfactant production was enhanced by 2.51-fold through the development of an optimized process using response surface methodology. The optimized culture medium contained crude oil 4.0%, yeast extract 0.7% and NaNO 3  3.0% that yielded 8.86 g/l of biosurfactant. Biosurfactant was characterized for stability up to 100 °C, at pH 5–10 and in the presence of NaCl concentration up to 8%. Biosurfactant demonstrated antimicrobial activity against  Salmonella typhimurium, Escherichia coli ,  Micrococcus luteus ,  Staphylococcus aureus  and  Candida tropicalis.  The morphological characterization was carried out by scanning electron microscopy with energy-dispersive X-ray analysis. The Fourier-transform infrared spectroscopy analysis reveals the lipopeptide nature of the biosurfactant produced by  B. aryabhattai  strain ZDY2. The biosurfactant finds application in healthcare and pharmaceutical industries.

Response surface methodology-based optimization of biosurfactant production from isolated Bacillus aryabhattai strain ZDY2