Eco-friendly approach in synthesis of silver nanoparticles and evaluation of optical, surface morphological and antimicrobial properties

Abstract

Silver nanoparticles (Ag NPs) were synthesized using Alternanthera sessilis leaf and Oregano root extract in an eco-friendly fashion and their significant physicochemical and optochemical properties were ascertained for nano-defined characteristics. The UV-visible spectrum showed a single and distinct absorbance peak at 433 nm (Alternanthera sessilis) and 425 nm (Oregano), typical SPR (surface plasmon resonance) for silver. Structural studies revealed nano-crystal with face centre cubic (FCC) symmetry with monodispersed nature. SEM studies showed spherical-shaped particles and the purity determined from EDX spectrum. The synthesized Ag NPs showed that antibacterial activity was studied. There was a significant inhibitory effect toward clinically important pathogens viz. B. subtilis, S. aureus, P. aeruginosa, and E. coli exposed to Ag NPs at different concentrations.

Synthesis and catalytic applications of silver nanoparticles: a sustainable chemical approach using indigenous reducing and capping agents from Hyptis capitata

“…The characteristic vibrational frequencies of the various chemical bonds existing in different functional groups present in the initial plant extracts and the resultant nanoparticles synthesized from leaf, fruit and stem extracts were obtained in a range of 500–3500 cm −1 . 31…”

“…FT-IR spectra of the synthesized silver nanoparticles were recorded using Perkin Elmer-400 spectrometer with ATR attachment. The characteristic vibrational frequencies of the various chemical bonds existing in different functional groups present in the initial plant extracts and the resultant nanoparticles synthesized from leaf, fruit and stem extracts were obtained in a range of 500-3500 cm -1 [31].…”

“…The characteristic vibrational frequencies of the various chemical bonds existing in different functional groups present in the initial plant extracts and the resultant nanoparticles synthesized from leaf, fruit and stem extracts were obtained in a range of 500-3500 cm À1 . 31 TEM is used to determine the particle size distribution and average size of particles on the nanometer scale of the synthesized nanoparticles. For TEM analysis, a JEOL JEM-2100 microscope with an EDX attachment was used.…”

Control of JE vector by organic compounds isolated and green nanoparticles synthesised from leaf extract of Holoptelea integrifolia (Roxb.)

“…The green synthesis of nano-material from plants can provide safe and beneficial way to the synthesis of metallic nanoparticles as it is easily available, eco-friendly and the rate of production is faster [7]. Out of gold, silver, copper, silicon, zinc, titanium, magnetite and palladium nanoparticle colloids, silver nanoparticles synthesised from plants had exhibited better catalytic and antibacterial property as well as chemical stability [8,9].…”

Optical characterization and concentration-dependent antibacterial activity of silver nanoparticles (AgNPs) using aqueous Melastoma malabathricum extract against Staphylococcus aureus

“…The antimicrobial activity apart from other activities like catalytic activi-ties, electronic, optical, and magnetic properties of silver nanoparticles is the reason for fabrication of AgNPs (Selvaraj et al, 2019;Marquis et al, 2016). Silver nanoparticles (AgNPs) also exhibit anti-in lammatory and immunomodulatory effects (Alessandrini et al, 2017;Borrego et al, 2016).…”