IMR Press / FBE / Volume 11 / Issue 1 / DOI: 10.2741/E848

Frontiers in Bioscience-Elite (FBE) is published by IMR Press from Volume 13 Issue 2 (2021). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on imrpress.com as a courtesy and upon agreement with Frontiers in Bioscience.

Open Access Article
Antimicrobial activity of Bacillus subtilis silver nanoparticles
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1 Department of Microbiology, Faculty of Science, Annamalai University, Annamalainagar, Tamil Nadu 608002, India
Send correspondence to: Chinnaiyan Uma, Department of Microbiology, Faculty of Science, Annamalai University, Annamalainagar, Tamil Nadu 608002, India, Tel: 91 9942370082, Fax: 91-4144-238080., E-mail: umasaravanan1@gmail.com
Front. Biosci. (Elite Ed) 2019, 11(1), 89–101; https://doi.org/10.2741/E848
Published: 1 January 2019
Abstract

We tested the hypothesis that silver nanoparticles (BsAgNPs) made by Bacillus subtilis subsp. inaquosorum exhibit antibacterial and antifungal activities. The bacteria formed nanoparticles in UV-visible spectra with the peak around 430 nanometer detected by surface plasmon resonance and Lambdamax. The FTIR spectra, SEM and XRD revealed the involvement of interaction of biological moieties in the formation of crystalline cuboidal nanoparticles that were had an average size of 10-20 nm. The particles exerted dose dependent antibacterial and antifungal activities and high dose equivalent to standard antibiotics. Minimum inhibitory concentration, minimum bactericidal and fungicidal concentrations were in the range from 3.1-25 microgram/ml and 6.3-50 microgram/ml, respectively. BsAgNPs significantly inhibited the growth of multiple strains including multidrug resistant (MDR) bacteria. Moreover, the combination of BsAgNPs and antibiotics showed synergistic inhibition of MDR strains. These data show that BsAgNPs have a great potential in the treatment of MDR bacteria without or with standard antibiotics.

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