Mycobiology

The Korean Society of Mycology (한국균학회)
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Antimicrobial and Synergistic Effects of Silver Nanoparticles Synthesized Using Soil Fungi of High Altitudes of Eastern Himalaya

  • Devi, Lamabam Sophiya (Microbiology Laboratory, Department of Biotechnology and Bioinformatics, North-Eastern Hill University) ;
  • Joshi, S.R. (Microbiology Laboratory, Department of Biotechnology and Bioinformatics, North-Eastern Hill University)
  • Received : 2011.10.27
  • Accepted : 2011.12.16
  • Published : 2012.03.31
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Abstract

Fifty three fungi isolated from soils of different microhabitats of eastern Himalayan range (3,400-3,600 msl) were screened for mycosynthesis of silver nanaoparticles (AgNPs) and their efficacy as antimicrobials were assessed in combination with commonly used antibiotics. Three isolates $Aspergillus$ $terreus$ SP5, $Paecilomyces$ $lilacinus$ SF1 and $Fusarium$ sp. MP5 identified based on morphological and 18S rRNA gene sequences were found to synthesize AgNPs. These nanoparticles were characterized by visual observation followed by UV-visible spectrophotometric analysis. The AgNPs synthesized by $Aspergillus$ $terreus$ SP5, $Paecilomyces$ $lilacinus$ SF1 and $Fusarium$ sp. MP5 showed absorbance maxima at 412, 419, and 421 nm respectively in the visible region. Transmission electron microscopy micrograph showed formation of spherical AgNPs of 5-50 nm size. The antimicrobial activity of the mycosynthesized nanoparticles were investigated alone and in combination with commonly used antibiotics for analysis of growth inhibition zone against test organisms, namely, $Staphylococcus$ $aureus$ MTCC96, $Streptococcus$ $pyogenes$ MTCC1925, $Salmonella$ $enterica$ MTCC735 and $Enterococcus$ $faecalis$ MTCC2729. The mycosynthesized nanoparticles showed potent antibacterial activity and interestingly their syngergistic effect with erythromycin, methicillin, chloramphenicol and ciprofloxacin was significantly higher as compared to inhibitions by AgNPs alone. The present study indicates that silver nanoparticles synthesized using soil borne indigenous fungus of high altitudes show considerable antimicrobial activity, deserving further investigation for potential applications.

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References

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