Alpinia nigra fruits mediated synthesis of silver nanoparticles and their antimicrobial and photocatalytic activities.

Autor: Baruah D; Natural Products Chemistry Group, Chemical Science and Technology Division, CSIR- North East Institute of Science and Technology, Jorhat, Assam 785006, India; Centre for Biotechnology and Bioinformatics, Dibrugarh University, Dibrugarh, Assam 786004, India., Yadav RNS; Department of Life Sciences, Dibrugarh University, Dibrugarh, Assam 786004, India., Yadav A; Biotechnology Group, Biological Science and Technology Division, CSIR- North East Institute of Science and Technology, Jorhat, Assam 785006, India., Das AM; Natural Products Chemistry Group, Chemical Science and Technology Division, CSIR- North East Institute of Science and Technology, Jorhat, Assam 785006, India. Electronic address: archanamoni@neist.res.in.
Jazyk: angličtina
Zdroj: Journal of photochemistry and photobiology. B, Biology [J Photochem Photobiol B] 2019 Dec; Vol. 201, pp. 111649. Date of Electronic Publication: 2019 Nov 02.
DOI: 10.1016/j.jphotobiol.2019.111649
Abstrakt: In the present systematic study, silver nanoparticles have been synthesized using the fruits of Alpinia nigra. Apart from the presence of saponins, glycosides, alkaloids, steroids, the extract of A. nigra fruits are rich in polyphenols. The Total Flavonoid and Phenol Content of A. nigra fruits extract is 718 mgRE/g extract and 74.9 mgGAE/g extract respectively. The formation of the nanoparticles was validated through characterization techniques like UV-Vis spectroscopy, X- ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Energy dispersive X-ray spectroscopy (EDX). The spherical shape of silver nanoparticles is observed in Transmission Electron Microscopy (TEM) images. The average particle size of the silver nanoparticles is 6 nm. The biomolecules of the fruit extract played the dual role of reducing and capping agents which is evident from Fourier Transform Infrared (FTIR) spectrometer and Scanning Electron Microscopy (SEM) image analysis. The A. nigra capped silver nanoparticles exhibited promising antimicrobial activity against gram negative bacteria Klebsiella pneumoniae, gram positive bacteria Staphylococcus aureus and the pathogenic fungus, Candida albicans. Amongst the three pathogens, Klebsiella pneumoniae is the most susceptible to silver nanoparticles. Furthermore, the nanoparticles efficiently catalysed the degradation of the anthropogenic dyes Methyl orange, Rhodamine B and Orange G in the presence of sunlight. The photocatalytic degradation process follows the pseudo-first order kinetics. These results confirm that the silver nanoparticles can be efficiently synthesized via a green route using A. nigra fruits with applications as antimicrobial and catalytic agents.
(Copyright © 2019 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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