Abstract
Nano-gold (Aunps) have emerged as promising options that exhibit unique features discrete from traditional materials suited for biomedical applications. Aunps were synthesized using flavonoid quercetin (Q) as reducing agent, and resultant nanoparticles were further conjugated with the flavonoid. The resultant nano-system was expected to perform a dual role as antibacterial and as antioxidant agent. Nano-gold surface plasmon peaks were recorded at 560 nm with size around 62 nm and having slim distribution pattern. Spherical particle with smooth surface was observed under TEM and AFM studies. TEM micrographs confirmed a homogeneous particle population of size around 30 nm. Quercetin association to nano-gold was corroborated through FTIR and EDAX analysis. Antioxidant nature of nano-gold prevented rapid oxidation of brilliant cresyl blue dye, in presence of sodium hypochlorite. Antimicrobial action of QuAunp was tested against Gram-negative bacteria Escherichia coli. Nano-gold designed produced a minimum inhibitory concentration of 7.6 μg/ml and minimum bactericidal concentration 10.5 μg/ml against E. coli. Further TEM analysis and membrane permeability studies revealed the impact of QuAunps on bacterial membrane leading to cell damage.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Dr. Suvadra and Mrs. Megha Jethwa. Dr. Tanay Pramanik and Dr. Partha Roy assisted in data interpretation. Dr. Partha Roy and Dr. Suvadra Das were responsible for drafting of the manuscript. All authors read and approved the final version of the manuscript.
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Das, S., Pramanik, T., Jethwa, M. et al. Flavonoid-Decorated Nano-gold for Antimicrobial Therapy Against Gram-negative Bacteria Escherichia coli. Appl Biochem Biotechnol 193, 1727–1743 (2021). https://doi.org/10.1007/s12010-021-03543-7
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DOI: https://doi.org/10.1007/s12010-021-03543-7