Biosurfactants production potential of native strains of Bacillus cereus and their antimicrobial, cytotoxic and antioxidant activities

Pak J Pharm Sci. 2018 Jan;31(1(Suppl.)):251-256.

Abstract

Present study was designed to evaluate the biosurfactant production potential by native strains of Bacillus cereus as well as determine their antimicrobial and antioxidant activities. The strains isolated from garden soil were characterized as B. cereus MMIC 1, MMIC 2 and MMIC 3. Biosurfactants were extracted as grey white precipitates. Optimum conditions for biosurfactant production were 37°C, the 7th day of incubation, 0.5% NaCl, pH 7.0. Moreover, corn steep liquor was the best carbon source. Biuret test, Thin Layer Chromatography (TLC), agar double diffusion and Fourier Transform Infrared Spectroscopy (FTIR) characterized the biosurfactants as cationic lipopeptides. Biosurfactants exhibited significant antibacterial and antifungal activity against S. aureus, E. coli, P. aeruginosa, K. pneumoniae, A. niger and C. albicans at 30 mg/ml. Moreover, they also possessed antiviral activity against NDV at 10 mg/ml. Cytotoxicity assay in BHK-21 cell lines revealed 63% cell survival at 10 mg/ml of biosurfactants and thus considered as safe. They also showed very good antioxidant activity by ferric-reducing activity and DPPH scavenging activity at 2 mg/ml. Consequently, the study offers an insight for the exploration of new bioactive molecules from the soil. It was concluded that lipopeptide biosurfactants produced from native strains of B. cereus may be recommended as safe antimicrobial, emulsifier and antioxidant agent.

MeSH terms

  • Animals
  • Anti-Infective Agents / metabolism
  • Anti-Infective Agents / pharmacology*
  • Antioxidants / metabolism
  • Antioxidants / pharmacology*
  • Bacillus cereus / genetics
  • Bacillus cereus / metabolism*
  • Cell Line
  • Cell Survival
  • Cricetinae
  • Drug Evaluation, Preclinical / methods
  • Lipopeptides / chemistry
  • Lipopeptides / metabolism
  • Lipopeptides / pharmacology
  • Microbial Sensitivity Tests
  • Newcastle disease virus / drug effects
  • Spectroscopy, Fourier Transform Infrared
  • Surface-Active Agents / chemistry
  • Surface-Active Agents / metabolism*
  • Surface-Active Agents / pharmacology

Substances

  • Anti-Infective Agents
  • Antioxidants
  • Lipopeptides
  • Surface-Active Agents