Characterization and antimicrobial activity of silver nanoparticles, biosynthesized using Bacillus species

I. Ghiuță, D. Cristea, C. Croitoru, J. Kost, R. Wenkert, I. Vyrides, A. Anayiotos, D. Munteanu

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

In this work, the biosynthesis of silver nanoparticles, using AgNO 3 as a precursor, by two Bacillus species, namely Bacillus amyloliquefaciens and Bacillus subtillis, is reported. After the synthesis stages, the absorbance of the brown nanoparticle colloidal solutions was assessed by UV–vis spectrophotometry, which showed the peak absorbance values at 418 nm and 414 nm, corresponding to surface plasmon resonance of silver nanoparticles. The EDX, SEM and DLS analyses confirmed the formation of spherical silver nanoparticles with an average diameter smaller than 140 nm. XRD confirmed the presence of face-centered cubic silver crystals, with the highest intensity peak at 2θ = 38.12°, which corresponds to the (111) diffraction planes. The antibacterial activity after 24 h of incubation was observed against gram negative bacteria: Escherichia coli, Pseudomonas aeruginosa, Salmonella, as well as gram positive: Staphylococcus aureus, Streptococcus pyogenes. Furthermore, the antifungal activity was assessed against Candida albicans. The inhibition zone was clearly observed on the plates containing silver nanoparticles, either standalone or in combination with antibiotics, thus showing their potentiating antibacterial effect.

Original languageEnglish
Pages (from-to)66-73
Number of pages8
JournalApplied Surface Science
Volume438
DOIs
StatePublished - 30 Apr 2018

Keywords

  • Bacillus amyloliquefaciens
  • Bacillus subtillis
  • Biosynthesis
  • Silver nanoparticles

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