Short Communication | Volume: 5, Issue: 3, March, 2015

In vitro synergistic effect of biosurfactant produced by Bacillus subtilis MTCC 441 against drug resistant Staphylococcus aureus

Mohammad Irfan†Sushil Kumar Shahi‡ P.K. Sharma   

Open Access   

Published:  Mar 28, 2015

DOI: 10.7324/JAPS.2015.50320

Microorganisms are capable to produce a wide range of surface active metabolites which are known as biosurfactant. In the present study, the production of biosurfactant from Bacillus subtilis MTCC 441 and evaluation of its synergistic activities with known antibiotics against drug resistance Staphylococcus aureus were performed. Drops collapse grid method was developed for detection of biosurfactant production in the medium. The production of biosurfactant was done in previously defined Carvalho’s medium. The extraction of biosurfactant was done in chloroform: methanol (2:1 v/v) solvent. The synergistic activity of crude biosurfactant was determined by disc diffusion and minimum inhibitory concentration assay. The Staphylococcus aureus was found resistant against ampicillin-sublactum (10µg), ampicillin (25µg), and cloxacillin (5µg), which showed no zone of inhibition but in the combination of crude biosurfactant, the zone of inhibition were measured as 14 mm, 14 mm and 19 mm, respectively. The crude biosurfactant showed good synergy with most of the antibiotics used in the study. The results demonstrated that biosurfactant possesses considerable potentiality to break the resistance of the pathogen tested. In future, it can be used for the development of effective drug against resistant bacteria.

Keyword:     Biosurfactant drug resistant synergistic effect Bacillus subtilis Staphylococcus aureus.


Mohammad Irfan, Sushil Kumar Shahi, P. K. Sharma. In Vitro Synergistic Effect of Biosurfactant Produced by Bacillus subtilis MTCC 441 Against Drug Resistant Staphylococcus aureus. J App Pharm Sci, 2015; 5 (03): 113-116.

Copyright:The Author(s). This is an open access article distributed under the Creative Commons Attribution Non-Commercial License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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