Microwave assisted green synthesis of silver nanoparticles for optical, catalytic, biological and electrochemical applications

Abstract

Plant-derived nanoparticles have multi-functionalities owing to their ecological origin and biocompatible nature. A novel and stable silver nanoparticle (AgNP) was reported here using Cyanthillium cinereum (C. cinereum) as a reducing as well as capping agent by rapid microwave-assisted green method. The synthesized nanoparticles revealed their crystalline and spherical nature with an average size of 19.25 ± 0.44 nm in HR-TEM analysis. The excitation of electrons from occupied d-bands to states above the Fermi level while employing photoluminescence studies of AgNP indicated their awesome optical properties. Rapid decomposition of dangerous organic dyes like methylene blue and fuchsine in the catalytic presence of AgNP was evidenced from simple UV-visible spectral analysis. In vitro antioxidant potential assessed by DPPH assay indicated an IC 50 value of 40.80 ± 0.14 lg/mL for the new AgNP. A substantial control on the growth of pathogenic bacteria such as Staphylococcus aureus and Klebsiella pneumonia can be achieved by synthesized nanoparticles as demonstrated by the well diffusion method. AgNP was also functioned as a non-enzymatic electrochemical sensor with a sharp oxidation peak with peak potentials at 0.366 V and it has a wide application as a bio sensor in neurobiology especially in the detection of neurotransmitters like dopamine with high sensitivity.

Biosynthesis and Characterization of Silver Nanoparticles Produced by Phormidium ambiguum and Desertifilum tharense Cyanobacteria

“…These results agree well with the previous reports on the antioxidant property of the biofabricated Ag-NPs using extracts, including plant extracts [ 52 ], bacteria [ 47 ], cyanobacteria [ 53 ], and microalgae [ 54 ]. The antioxidant characteristics of nanoparticles are mostly determined by the methods used in nanoparticle preparation and the ability of the living organism to adapt to harsh environmental conditions, such as cyanobacteria's phototrophic existence and constant exposure to high oxygen and radical stressors.…”

Bionanofactories for Green Synthesis of Silver Nanoparticles: Toward Antimicrobial Applications

“…The resultant AgNPs were found to demonstrate antibacterial activity toward bacterial species such as Klebsiella pneumoniae and Staphylococcus aureus . In addition, it was suggested that the resultant nanoparticles can be employed as promising Candida tes in applications as biosensors and nonenzymatic electrochemical sensors [ 180 ].…”

Synergistic antibacterial and mosquitocidal effect of Passiflora foetida synthesized silver nanoparticles

“…In FTIR spectrum, the strong absorption peak at 1084.03 cm -1 can be attributed to -C-O stretching vibrations in the carboxyl group and denoted stretching vibrational bands responsible for compounds like flavonoids (Siddiqui et al, 2000) be held responsible for efficient capping and stabilisation of formed AgNPs. The sharp band at 823.63 cm -1 was due to an aromatic ring (Anjana et al, 2021).The C=O stretch at 1660.77 cm -1 represented the presence of amide. The strong,broader, and highest absorption peaks referring to N=O bend at 1383.01 cm -1 was attributed to the nitro compounds.The stretching vibrations at 2883.68 cm -1 indicated the presence of alkane groups.The short C=O stretching vibration at 1784.21 cm -1 corresponded to either aldehydes or ketones or ester group.…”