Fabrication and characterisation of silver nanoparticles using bract extract of Musa paradisiaca for its synergistic combating effect on phytopathogens, free radical scavenging activity, and catalytic efficiency

Abstract

This work explores the rapid synthesis of silver nanoparticles (AgNPs) from Musa paradisiaca (M. paradisiaca) bract extract. The bio-reduction of Ag + ion was recorded using ultraviolet-visible spectroscopy by a surface plasmon resonance extinction peak with an absorbance at 420 nm. The phytoconstituents responsible for the reduction of AgNPs was probed using Fourier transform infrared spectroscopy. The X-ray diffraction pattern confirmed the formation of crystalline AgNPs that were analogous to selected area electron diffraction patterns. Morphological studies showed that the obtained AgNPs were monodispersed with an average size of 15 nm. The biologically synthesised AgNPs showed higher obstruction against tested phytopathogens. The synthesised AgNPs exhibited higher inhibitory zone against fungal pathogen Alternaria alternata and bacterial pathogen Pseudomonas syringae. Free radical scavenging potential of AgNPs was investigated using 1,1-diphenyl-2picryl hydroxyl and 2,2-azinobis (3-ethylbenzothiazoline)-6-sulphonic acid assays which revealed that the synthesised AgNPs act as a potent radical scavenger. The catalytic efficiency of the synthesised AgNPs was investigated for azo dyes, methyl orange (MO), methylene blue (MB) and reduction of o-nitrophenol to o-aminophenol. The results portrayed that AgNPs act as an effective nanocatalyst to degrade MO to hydrazine derivatives, MB to leucomethylene blue, and o-nitro phenol to o-amino phenol

Medicinal plants mediated the green synthesis of silver nanoparticles and their biomedical applications

“…AgNPs encapsulated with calcium signals minimised retinal cell damage and might be used for retinal imaging [193]. Musa paradisiaca bract extract‐mediated synthesised AgNPs exhibited a higher inhibitory zone against fungal pathogens and their catalytical efficacy showed it to be a promising nano‐catalyst to degrade methyl orange to hydrazine derivative, methylene blue to leuco‐methylene blue, and o‐nitro phenol to o‐ aminophenol [147]. AgNPs were shown to be effective as new nanostructured systems for cancer diagnosis and therapy.…”

“…The AgNPs solution has proton-donating properties, it may act as a free radical scavenger. Hence, it can be used as a potential application in the pharmaceutical and agriculture fields [147]. AgNPs produced using Artemisia quttensis extract was rapid, cost effective, simple, and has good stability with the promising antiradical potential, which can be used in nutraceutical and pharmaceutical industries [148].…”

Green synthesis of silver nanoparticles using Piper longum catkin extract irradiated by sunlight: antibacterial and catalytic activity

“…Where, obtained extract peaks were shifted towards lower side due to AgNO 3 reduced to Ag + ions by the presence of hydroxyl groups (or) H-OH stretching of phytochemicals in the extract [41]. The plausible mechanism for the reduction of AgNO 3 to AgNPs is that the flavonoids present in the P. longum catkin extract may undergo tautomeric transformation of the enol to the keto form that release reactive hydrogen atoms that are responsible for the reduction of AgNO 3 to AgNPs [5].…”

“…Hence, the existence of π-conjugated azo bonds and resonance characteristics make these dyes more stable [1][2][3]. Also inorganic pollutants, such as nitrophenols, are considered as toxic and refractory substances that damage the liver, kidney, and central nervous system of both the human beings and animals [4]. Tremendous discharge of these contaminants into the environment causes detrimental impact on the aquatic system.…”

“…Conventional technologies, such as adsorption tactics, fenton-like reactions, biological degradation, and photocatalysis, are employed for the degradation of these pollutants. However, these techniques have several limitations, such as adsorption results in the transfer of pollutants from wastewater to solid waste, biological degradation encounters poor efficiency, fenton-like reaction produces ferrous slurry, and the H 2 O 2 requirement leds to complexity [5,6]. Hence, degradation of dyes and organic pollutants is said to be accomplished using photocatalysis, although their practical applications toward industries are constrained.…”