Abstract
Understanding the biosynthetic mechanism of gold nanoparticle formation is the key to controlling the size, dispersity, and morphology of the nanoparticles. Reduction of gold (III) to gold (0) in cell-free extracts of Candida parapsilosis ATCC 7330 is not only enzymatic, as confirmed by experiments with heat denatured extracts. In addition to proteins, cellular reducing equivalents also contribute to the formation of gold nanoparticles in a concentration-dependent manner. Characterization of the bio-synthesized gold nanoparticles using X-ray photoelectron spectroscopy and elemental analysis revealed that nanoparticles are stabilized by proteins. The importance of protein three-dimensional structure in producing stable gold nanoparticles is also addressed. Making free thiol groups (–SH) unavailable by derivatizing them in protein extracts resulted in monodisperse gold nanoparticles implying that free –SH increase aggregation and emphasize this as a possible strategy to produce monodisperse gold nanoparticles in biological extracts which is otherwise difficult.
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Acknowledgments
SK extends his thanks to the Indian Institute of Technology Madras for the HTRA-fellowship. The authors thank the DST-FIST facility of the Department of Biotechnology, Central TEM facility, Sophisticated Analytical Instrumental Facility (SAIF) of IIT Madras.
Funding
This research was funded by the Board of Research in Nuclear Sciences, Department of Atomic Energy, Government of India (34/14/40/2014-BRNS).
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Krishnan, S., Jayakumar, D., Madhyastha, H. et al. The Complexity of Microbial Metal Nanoparticle Synthesis: A Study of Candida parapsilosis ATCC 7330 mediated Gold Nanoparticles Formation. BioNanoSci. 11, 336–344 (2021). https://doi.org/10.1007/s12668-021-00825-6
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DOI: https://doi.org/10.1007/s12668-021-00825-6