Biofabrication of silver nanoparticles using bacteria from mangrove swamp

Biofabrication of silver nanoparticles using bacteria from mangrove swamp

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The last decade has observed a rapid advancement in utilising biological system towards bioremediation of metal ions in the form of respective metal nanostructures or microstructures. The process may also be adopted for respective metal nanoparticle biofabrication. Among different biological methods, bacteria-mediated method is gaining great attention for nanoparticle fabrication due to their eco-friendly and cost-effective process. In the present study, silver nanoparticle (AgNP) was synthesised via continuous biofabrication using Aeromonas veronii, isolated from swamp wetland of Sunderban, West Bengal, India. The biofabricated AgNP was further purified to remove non-conjugated biomolecules using size exclusion chromatography, and the purified AgNPs were characterised using UV–visible spectroscopy, X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy (TEM). Additionally, the presence of proteins as capping and stabilising agents was confirmed by the amide-I and amide-II peaks in the spectra obtained using attenuated total reflection Fourier transform infrared spectroscopy. The size of biofabricated AgNP was 10–20 nm, as observed using TEM. Additionally, biofabricated AgNP shows significant antibacterial potential against E. coli and S. aureus. Hence, biofabricated AgNP using Aeromonas veronii, which found resistant to a significant concentration of Ag ion, showed enhanced antimicrobial activity compared to commercially available AgNP.

Other keywords: bacteria-mediated method; silver nanoparticles; amide-II peaks; amide-I peaks; TEM; metal nanoparticle biofabrication; field emission scanning electron microscopy; nonconjugated biomolecules; size exclusion chromatography; attenuated total reflection Fourier transform infrared spectroscopy; S. aureus; transmission electron microscopy; antibacterial potential; Aeromonas veronii; microstructures; UV-visible spectroscopy; capping agents; X-ray diffraction; stabilising agents; E. coli; purification; swamp wetland; metal ions; biological methods; proteins; eco-friendly; size 10 nm to 20 nm; metal nanostructures; biological system; cost-effective process; antimicrobial activity; mangrove swamp; bioremediation; bacteria; Ag

Subjects: Infrared and Raman spectra in metals; Interactions with radiations at the biomolecular level; Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials; Optical properties of metals and metallic alloys (thin films/low-dimensional structures); Biomedical materials; Infrared molecular spectra; Ultraviolet molecular spectra; Chromatography; Biomolecular interactions, charge transfer complexes; Visible and ultraviolet spectra of metals, semimetals, and alloys; Physical chemistry of biomolecular solutions and condensed states; Preparation of metals and alloys (compacts, pseudoalloys); Visible molecular spectra; Macromolecular configuration (bonds, dimensions); Low-dimensional structures: growth, structure and nonelectronic properties; Biomolecular structure, configuration, conformation, and active sites; Electronic structure and spectra of macromolecules; Nanotechnology applications in biomedicine

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