Abstract
The emergence of multidrug-resistant microbes and newly outbreaking diseases are one of the major threats before mankind. This paves the way for researchers to explore new antimicrobial agents that possess common day-to-day applications. In this concern, we have fabricated the antimicrobial Ag-kaolin functional nanostructures by simple and sustainable protocol employing Murraya koenigii fruit extract. UV-visible spectra (UV-Vis) of the Ag-kaolin exhibit absorption peak at 430 nm which corresponds to the characteristic surface plasmon resonance of Ag nanoparticles. X-ray diffraction pattern (XRD) shows the diffraction peak at 37.6° confirms their face-centred cubic nature with (111) plane. Furthermore, the formation of Ag-kaolin functional nanostructures was confirmed through a scanning electron microscope (SEM) and energy-dispersive X-ray spectrum (EDX) analysis. The transmission electron microscopic (TEM) studies reveal the effective formation of quasi-spherical monodispersed Ag nanoparticles having 20–30-nm diameters on the kaolin clay. The bio-synthesized Ag-kaolin nanostructures showed excellent antimicrobial activity against pathogenic gram-positive (Staphylococcus aureus, Bacillus subtilis) and gram-negative (Escherichia coli) bacteria respectively with the inhibition zones of 26 mm, 25 mm and 30 mm.
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Acknowledgements
S.V. acknowledges the University Grants Commission (UGC), Delhi, India, for the financial support for this research activity through the Minor Research Project (MRP/UGC-SERO-Proposal No.: 1593). The authors express sincere thanks to Sophisticated Test and Instrumentation Centre (STIC), Cochin University of Science and Technology, Cochin, Kerala, India, for providing their valuable support through various analytical services.
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Hariram, M., Ganesan, V., Muthuramkumar, S. et al. Functionalization of kaolin clay with silver nanoparticles by Murraya koenigii fruit extract-mediated bioreduction process for antimicrobial applications. J Aust Ceram Soc 57, 505–513 (2021). https://doi.org/10.1007/s41779-020-00545-2
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DOI: https://doi.org/10.1007/s41779-020-00545-2