Abstract
The development of an eco-friendly and reliable process for the synthesis of gold nanomaterials (AuNPs) using microorganisms is gaining importance in the field of nanotechnology. In the present study, AuNPs have been synthesized by bio-reduction of chloroauric acid (HAuCl4) using the fungal culture filtrate (FCF) of Alternaria alternata. The synthesis of the AuNPs was monitored by UV–visible spectroscopy. The particles thereby obtained were characterized by UV, dynamic light scattering (DLS), X-ray diffraction (XRD), energy dispersive X-ray (EDX) analysis, Fourier transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM) and transmission electron microscopy (TEM). Energy-dispersive X-ray study revealed the presence of gold in the nanoparticles. Fourier transform infrared spectroscopy confirmed the presence of a protein shell outside the nanoparticles which in turn also support their stabilization. Treatment of the fungal culture filtrate with aqueous Au+ ions produced AuNPs with an average particle size of 12 ± 5 nm. This proposed mechanistic principal might serve as a set of design rule for the synthesis of nanostructures with desired architecture and can be amenable for the large scale commercial production and technical applications.
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Abbreviations
- FCF:
-
Fungal culture filtrate
- DLS:
-
Dynamic light scattering
- XRD:
-
X-ray diffraction
- EDX:
-
Energy dispersive X-ray
- FTIR:
-
Fourier transform infrared
- AFM:
-
Atomic force microscopy
- TEM:
-
Transmission electron microscopy
- HAuCl4 :
-
Chloroauric acid
- AuNPs:
-
Gold nanoparticles
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Acknowledgments
The authors (Krishnendu Acharya and Dipankar Chattopadhyay) would like to thank Center for Research in Nanoscience and Nanotechnology, University of Calcutta (Sanction no. Conv/043/Nano Pr. 2009) for financial support and Anirban Chakraborty for carrying out AFM images and for AFM machine facility given by Raja Bazar Science College, University of Calcutta.
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Sarkar, J., Ray, S., Chattopadhyay, D. et al. Mycogenesis of gold nanoparticles using a phytopathogen Alternaria alternata . Bioprocess Biosyst Eng 35, 637–643 (2012). https://doi.org/10.1007/s00449-011-0646-4
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DOI: https://doi.org/10.1007/s00449-011-0646-4