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Volume 70, Issue 10


Biogenic synthesis of silver nanoparticles using cell-free extract of Bacillus safensis LAU 13: antimicrobial, free radical scavenging and larvicidal activities

Agbaje Lateef / Sunday A. Ojo
  • Department of Pure and Applied Biology, Ladoke Akintola University of Technology, PMB 4000, Ogbomoso, Nigeria
  • Other articles by this author:
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/ Abiola S. Akinwale
  • Department of Pure and Applied Biology, Ladoke Akintola University of Technology, PMB 4000, Ogbomoso, Nigeria
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/ Luqmon Azeez / Evariste B. Gueguim-Kana
  • Department of Microbiology, School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg 3209, South Africa
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/ Lorika S. Beukes
  • Microscopy and Microanalysis Unit, School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg 3209, South Africa
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2016-01-08 | DOI: https://doi.org/10.1515/biolog-2015-0164


The cell-free extract of Bacillus safensis LAU 13 strain (GenBank accession No: KJ461434) was used for green biosynthesis of silver nanoparticles (Ag-NPs). Characterization of Ag-NPs was carried out using UV-VIS spectroscopy, Fourier-transform infrared spectroscopy, and transmission electron microscopy. Evaluation of synthesized Ag-NPs as antimicrobial agents was done using multi-drug resistant clinical isolates as well as their synergistic effects when combined with some selected antibiotics. Furthermore, potential of Ag-NPs as antimicrobial additives in paint was demonstrated. The Ag-NPs have maximum absorbance at 419 nm, with peaks at 3308, 2359, 1636, and 422 cm−1, indicating that proteins were the capping and stabilisation molecules in the synthesis of Ag-NPs. The particles were spherical shaped having size of 5-95 nm, with silver as the prominent metal from the energy dispersive X-ray analysis, while selected area electron diffraction pattern agrees well with the crystalline nature and face-centred cubic phase of Ag-NPs. Inhibition of Staphylococcus aureus, Escherichia coli, Klebsiella granulomatis and Pseudomonas aeruginosa was achieved at 100 μg/mL. Improvement of activities of augmentin, ofloxacin and cefixime to the tune of 7.4-142.9% was achieved in synergistic study, while total inhibitions of P. aeruginosa, S. aureus, Aspergillus flavus and Aspergillus fumigatus were achieved in Ag-NPs-paint admixture. The Ag-NPs showed potent antioxidant and larvicidal activities with IC50 and LC50 of 15.99 and 42.19 μg/mL, respectively. The present study demonstrated that the biosynthesized Ag-NPs have potent biological activities, which can find applications in diverse areas. The report adds to the growing biotechnological relevance of B. safensis.

Keywords: Bacillus safensis; silver nanoparticles; antimicrobial activity; multi-drug resistance; paint; antioxidant; larvicidal activity


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About the article

Received: 2015-09-14

Accepted: 2015-10-16

Published Online: 2016-01-08

Published in Print: 2015-10-01

Citation Information: Biologia, Volume 70, Issue 10, Pages 1295–1306, ISSN (Online) 1336-9563, ISSN (Print) 0006-3088, DOI: https://doi.org/10.1515/biolog-2015-0164.

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