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Medicinal plants serve as a rich source of diverse bioactive phytochemicals that might even take part in bioreduction and
stabilization of phytogenic nanoparticles with immense therapeutic properties. Dioscorea bulbifera is a potent medicinal
plant used in both Indian and Chinese traditional medicine owing to its rich phytochemical diversity. Herein, we report the rapid
synthesis of novel AucoreAgshell DBTE). AucoreAgshell NPs synthesis was completed within 5 hours showing a prominent peak at 540
nm. The bioreduced nanoparticles were characterized using high resolution transmission electron microscopy (HRTEM), energy
dispersive spectroscopy (EDS), dynamic light scattering (DLS), X-ray diffraction spectroscopy (XRD) and Fourier transform infrared
spectroscopy (FTIR). The particles were further checked for antibiofilm activity against bacterial pathogens. Scanning electron
microscopy (SEM) and atomic force microscopy (AFM) was employed to study the mechanism behind antibiofilm activity. HRTEM
analysis revealed 9 nm inner core of elemental gold covered by a silver shell giving a total particle diameter up to 15 nm. AucoreAgshell
NPs were comprised of 57.34�±1.01% gold and 42.66�±0.97% silver of the total mass. AucoreAgshell NPs showed highest biofilm inhibition
up to 83.68�±0.09% against Acinetobacter baumannii. Biofilms of Pseudomonas aeruginosa, Escherichia coli and Staphylococcus
aureus were inhibited up to 18.93�±1.94%, 22.33�±0.56% and 30.70�±1.33%, respectively. Scanning electron microscopy (SEM) and
atomic force microscopy (AFM) confirmed unregulated cellular efflux through pore formation leading to cell death. This is the first
report of synthesis, characterization, antibiofilm and antileishmanial activity of AucoreAgshell NPs synthesized by D. bulbifera.
Biography
Sougata Ghosh has completed his BSc and MSc in Microbiology from Savitribai Phule Pune University, India. He is working on novel nanomaterial for disease control and bacterial pathogenesis in his PhD research. He has published 35 international research papers in peer reviewed international journals and filed 3 patents which are widely appreciated in various national and international conferences.