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Can J Microbiol. 2017 Feb;63(2):169-178. doi: 10.1139/cjm-2016-0365. Epub 2016 Oct 24.

Effect of Bacoside A on growth and biofilm formation by Staphylococcus aureus and Pseudomonas aeruginosa.

Author information

1
a Department of Microbiology, University of Kalyani, Kalyani 741235, India.
2
b Department of Pathology, Regional Institute of Ophthalmology, Kolkata 700073, India.

Abstract

The goal of this study was to evaluate the antibiofilm and antimicrobial activities of Bacoside A, a formulation of phytochemicals from Bacopa monnieri, against Staphylococcus aureus and Pseudomonas aeruginosa, which are known to form biofilms as one of their virulence traits. The antimicrobial effects of Bacoside A were tested using the minimum inhibitory concentration and minimum bactericidal concentration assays. A cell membrane disruption assay was performed to find its possible target site. MTT assay, crystal violet assay, and microscopic studies were performed to assess the antibiofilm activity. Bacoside A showed antimicrobial activity against both test organisms in their planktonic and biofilm states. At a subminimum inhibitory concentration of 200 μg·mL-1, Bacoside A significantly removed ∼88%-93% of bacterial biofilm developed on microtiter plates. Biochemical and microscopic studies suggested that the eradication of biofilm might be due to the loss of extracellular polymeric substances and to a change in cell membrane integrity of the selected bacterial strains treated with Bacoside A. These results indicate that Bacoside A might be considered as an antimicrobial having the ability to disrupt biofilms. Thus, either alone or in combination with other therapeutics, Bacoside A could be useful to treat biofilm-related infections caused by opportunistic bacterial pathogens.

KEYWORDS:

Bacoside A; Pseudomonas aeruginosa; Staphylococcus aureus; biofilm eradication; extracellular polymeric substances; substances polymériques extracellulaires; éradication de biofilm

PMID:
28099040
DOI:
10.1139/cjm-2016-0365
[Indexed for MEDLINE]

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