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Biosynthesis of extracellular and intracellular gold nanoparticles by Aspergillus fumigatus and A. flavus

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Abstract

Green chemistry is a boon for the development of safe, stable and ecofriendly nanostructures using biological tools. The present study was carried out to explore the potential of selected fungal strains for biosynthesis of intra- and extracellular gold nanostructures. Out of the seven cultures, two fungal strains (SBS-3 and SBS-7) were selected on the basis of development of dark pink colour in cell free supernatant and fungal beads, respectively indicative of extra- and intracellular gold nanoparticles production. Both biomass associated and cell free gold nanoparticles were characterized using X-ray diffractogram (XRD) analysis and transmission electron microscopy (TEM). XRD analysis confirmed crystalline, face-centered cubic lattice of metallic gold nanoparticles along with average crystallite size. A marginal difference in average crystallite size of extracellular (17.76 nm) and intracellular (26 and 22 nm) Au-nanostructures was observed using Scherrer equation. In TEM, a variety of shapes (triangles, spherical, hexagonal) were observed in both extra- and intracellular nanoparticles. 18S rRNA gene sequence analysis by multiple sequence alignment (BLAST) indicated 99 % homology of SBS-3 to Aspergillus fumigatus with 99 % alignment coverage and 98 % homology of SBS-7 to Aspergillus flavus with 98 % alignment coverage respectively. Native-PAGE and activity staining further confirmed enzyme linked synthesis of gold nanoparticles.

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  1. Department of Microbiology, Mata Gujri College, Fatehgarh Sahib, 140406, Punjab, India

    Saurabh Gupta & Shruti Bector

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  1. Saurabh Gupta
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  2. Shruti Bector
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Correspondence to Saurabh Gupta.

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Gupta, S., Bector, S. Biosynthesis of extracellular and intracellular gold nanoparticles by Aspergillus fumigatus and A. flavus . Antonie van Leeuwenhoek 103, 1113–1123 (2013). https://doi.org/10.1007/s10482-013-9892-6

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  • DOI: https://doi.org/10.1007/s10482-013-9892-6

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