Biogenic synthesis of silver nanoparticles using a pod extract ofCola nitida: Antibacterial and antioxidant activities and application as a paint additive

Abstract

This work reports the biogenic synthesis of silver nanoparticles (AgNPs) using the pod extract of Cola nitida, the evaluation of their antibacterial and antioxidant activities, and their application as an antimicrobial additive in paint. The AgNPs were characterized with UV-Vis spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, and transmission electron microscopy (TEM). The AgNP solution was dark brown with a maximum absorbance occurring at 431.5 nm. The FTIR spectrum showed strong peaks at 3336.85, 2073.48, and 1639.49 cm −1 , indicating that proteins acted as the capping and stabilization agents in the synthesis of the AgNPs. The AgNPs were spherical, with sizes ranging from 12 to 80 nm. Energy dispersive X-ray (EDX) analysis showed that silver was the prominent metal present, while the selected area electron diffraction pattern conformed to the face-centred cubic phase and crystalline nature of AgNPs. At various concentrations between 50 and 150 g/ml, the AgNPs showed strong inhibition of the growth of multidrug resistant strains of Klebsiella granulomatis, Pseudomonas aeruginosa, and Escherichia coli. In addition, at 5 g/ml, the AgNPs completely inhibited the growth of Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Aspergillus niger, A. flavus and A. fumigatus in a paint-AgNP admixture. The AgNPs exhibited a potent antioxidant activity with an IC 50 of 43.98 g/ml against 2,2-diphenyl-1-picrylhydrazyl and a ferric ion reduction of 13.62-49.96% at concentrations of 20-100 g/ml. This study has

Silver nanoparticles (AgNPs) biosynthesized using pod extract of Cola nitida enhances antioxidant activity and phytochemical composition of Amaranthus caudatus Linn

“…The AgNPs used in this study have been found to be highly potent, with higher DPPH scavenging activities than quercetin and b-carotene (Lateef et al 2016g). Antioxidant activities of leaf extracts of A. caudatus witnessed reduction with increase in the concentration of AgNPs.…”

“…AgNPs used in this study were biologically synthesized using the pod extract of C. nitida as previously reported by Lateef et al (2016g). The scheme of the synthesis is shown in Fig.…”

“…1. The biosynthesized AgNPs were characterized by UV-Vis spectroscopy, Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM) following standard procedures (Lateef et al 2016g). …”

Fabrication of silver chloride nanoparticles using a plant serine protease in combination with photoactivation and investigation of their biological activities

“…Although the fabricated AgCl‐NPs had approximately 5.6‐fold lower antioxidant activity than the ascorbic acid standard, they might be used as a synergetic antioxidant agent. The results of DPPH scavenging activity indicated that biofabricated AgCl‐NPs in this study had antioxidant activity like other biofabricated Ag/AgCl‐NPs such as nanoparticles fabricated using M. citrifolia leaf extract , C. papya peel extract , pod extract of Cola nitida and Chenopodium murale leaf extract .…”

Improved Yield of Green Synthesized Crystalline Silver Nanoparticles With Potential Antioxidant Activity

“…The increase in the absorbance of the reaction mixture indicates stronger reducing power. The free radical scavenging activity of SNPs attributes to functional groups of bio-reductant molecules adhered to the surface of nanoparticles 35 .…”