Biosurfactants as inhibitors of the adhesion of pathogenic bacteria

Abstract

Biosurfactants have gained more attention in the past decade as possible medical resources. They are useful therapeutic agents againstmany infections because of their antibacterial, antifungal, and antiviral properties. Additionally, the anti-adherent activities of thesecompounds counter to a number of pathogens suggest that they could be useful as an anti-adherent coating for medical inserts, helpingto prevent infections in hospitals without the use of chemicals. This study aims to investigate the antiadhesive activities of biosurfactantsextracted from Lactobacillus brevis and Bacillus sp. against seven clinical pathogens. Biosurfactants at different concentrations wereapplied to polystyrene surfaces, and then the attachment of pathogenic strains was evaluated. The adhesion of microbes to n-hexadecanewas also studied. As a result, the bacterial strains with 50 mg/ml of Lactobacillus brevis biosurfactant displayed a 69–73% reduction inadhesion. In contrast to the first biosurfactant, a biosurfactant extracted from Bacillus sp. significantly reduced bacterial attachment at allconcentrations studied, although to a lesser extent. As the concentration was increased in surface conditioning tests, the anti-adhesiveactivity increased, showing the significance of considering this. In summary, both biosurfactants demonstrated excellent potential asanti-adhesive compounds that can prevent microbial contamination. Our findings provided evidence that biosurfactants could be used inmedical applications.