Abstract
Abstract In an ongoing survey for bioactive microbial metabolites from different biospheres of India, a new marine bacterium identified as Pontibacter korlensis strain SBK-47 was isolated from the coastal waters of Karaikal, Puducherry, India, which produced a novel lipopeptide biosurfactant. The biosurfactant was purified and structurally elucidated as Palmitic acid-Ser-Asp-Val-Ser-Ser based on TLC, FT-IR, NMR, GC–MS, HPLC, MALDI-TOF and tandem MS analysis. This novel lipopeptide biosurfactant was named as Pontifactin. Pontifactin exhibited a surface tension reduction and critical micelle concentration (CMC) of 25 mN m−1 and 25 mg L−1, respectively. Furthermore, the biosurfactant showed emulsification and surface tension stability over a wide range of pH (4–10) and temperature up to 100 °C. Pontifactin showed promising antimicrobial activity against Streptococcus mutans, Micrococcus luteus, Salmonella typhi and Klebsiella oxytoca at a biosurfactant concentration ranging between 1 and 2 mg mL−1 and maximum anti-biofilm activity at the biosurfactant concentration of 2 mg mL−1 against Bacillus subtilis, Staphylococcus aureus, Salmonella typhi and Vibrio cholerae. This is the first report on Pontifactin, a multifunctional lipopeptide biosurfactant, produced by a marine Pontibacter korlensis strain SBK-47, exhibiting promising surface-active, antimicrobial and anti-biofilm activities and thus finds possible use in biomedical applications.
Published Version
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