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We report synthesis of silver nanoparticles (AgNPs) from  Streptomyces xinghaiensis  OF1 strain, which were characterised by UV–Vis and Fourier transform infrared spectroscopy, Zeta sizer, Nano tracking analyser, and Transmission electron microscopy. The antimicrobial activity of AgNPs alone, and in combination with antibiotics was evaluated against bacteria, namely  Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus  and  Bacillus subtilis , and yeasts viz.,  Candida albicans  and  Malassezia furfur  by using micro-dilution method. The minimum inhibitory concentration (MIC) and minimum biocidal concentration of AgNPs against bacterial and yeast strains were determined. Synergistic effect of AgNPs in combination with antibacterial and antifungal antibiotics was determined by FIC index. In addition, MTT assay was performed to study cytotoxicity of AgNPs alone and in combination with antibiotics against mouse fibroblasts and HeLa cell line. Biogenic AgNPs were stable, spherical, small, polydispersed and capped with organic compounds. The variable antimicrobial activity of AgNPs was observed against tested bacteria and yeasts. The lowest MIC (16 µg ml −1 ) of AgNPs was found against  P. aeruginosa , followed by  C. albicans  and  M. furfur  (both 32 µg ml −1 ),  B. subtilis  and  E. coli  (both 64 µg ml −1 ), and then  S. aureus  and  Klebsiella pneumoniae  (256 µg ml −1 ). The high synergistic effect of antibiotics in combination with AgNPs against tested strains was found. The in vitro cytotoxicity of AgNPs against mouse fibroblasts and cancer HeLa cell lines revealed a dose dependent potential. The IC 50  value of AgNPs was found in concentrations of 4 and 3.8 µg ml −1 , respectively. Combination of AgNPs and antibiotics significantly decreased concentrations of both antimicrobials used and retained their high antibacterial and antifungal activity. The synthesis of AgNPs using  S. xinghaiensis  OF1 strain is an eco-friendly, cheap and nontoxic method. The antimicrobial activity of AgNPs could result from their small size. Remarkable synergistic effect of antibiotics and AgNPs offer their valuable potential in nanomedicine for clinical application as a combined therapy in the future.

world journal of microbiology and biotechnology incorporating the mircen journal of applied microbiology and biotechnology/world journal of microbiology and biotechnology

Synthesis, characterization and evaluation of antimicrobial and cytotoxic activities of biogenic silver nanoparticles synthesized from Streptomyces xinghaiensis OF1 strain