Journal
PREPARATIVE BIOCHEMISTRY & BIOTECHNOLOGY
Volume 48, Issue 7, Pages 582-588Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10826068.2018.1476880
Keywords
Antimicrobial activity; Bacillus endophyticus; biosynthesis; halotolerant bacterium; silver nanoparticles
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Funding
- National Key Research and Development Program of China [2017YFB0308401]
- Sichuan Key Research and Development Program [2017GZ0430]
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We have conducted a thorough study on extracellular biosynthesis of silver nanoparticles (AgNPs) by a halotolerant bacterium Bacillus endophyticus SCU-L, which was identified by 16S rRNA gene sequencing analysis. This strain was selected during an ongoing research programme aimed at finding a novel biological method for green nanosynthetic routes using the extremophiles in unexplored hypersaline habitats. The biosynthesized AgNPs were characterized and analyzed with UV-vis spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, atomic force microscopy and X-ray diffraction. Further, the AgNPs were found to be spherical in shape with an average particle size of about 5.1nm, and it was stable in aqueous solution for three months period of storage at room temperature under dark condition. Also, the synthesized AgNPs significantly presented antimicrobial activity against Candida albicans, Escherichia coli, Salmonella typhi and Staphylococcus aureus. The above results suggested that the present work may provide a valuable reference and theoretical basis for further exploration on microbial biosynthesis of AgNPs by halotolerant bacteria.
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