Synthesis and Catalytic and Biological Activities of Silver and Copper Nanoparticles Using Cassia occidentalis

Abstract

An ecofriendly and green method for the synthesis of silver and copper nanoparticles has developed using aqueous leaves extract of Cassia occidentalis. The formation of AgNPs and CuNPs was monitored by measuring the UV-Vis spectra. The morphology and crystalline phase of the metal nanoparticles were determined using transmission electron microscopy (TEM) and scanning electron microscopy (SEM) with X-ray energy dispersive spectrophotometer (EDX) and X-ray diffraction (XRD). The synthesized metal nanoparticles were generally found to be spherical and oval in shape. The AgNPs and CuNPs showed highly potent antibacterial activity against Escherichia coli and Salmonella typhi bacteria, respectively. The CuNPs showed higher radical scavenging activity than AgNPs. The AgNPs showed lower haemolysis (1.7%) exhibiting lesser toxicity as compared to CuNPs. The CuNPs have better catalytic ability for the reduction of 4-nitrophenol and 2-nitrophenol as compared to AgNPs.

Facile Biogenic Synthesis and Characterization of Seven Metal-Based Nanoparticles Conjugated with Phytochemical Bioactives Using Fragaria ananassa Leaf Extract

“…These agglomerates easily dispersed in water with ultrasonic vibrations ( Figure 3 e). The obtained results are similar to the results of previous reports [ 27 ].…”

“…The Cu NPs exhibit a dark brown color in aqueous solution due to the SPR excitation in UV-Vis spectrum depending upon the particle size. The similar absorption bands for Cu NPs have been reported in this range [ 27 , 28 ].…”

Green synthesis of silver nanoparticles mediated by traditionally used medicinal plants in Sudan

“…While Cassia occidentalis silver nanoparticles showed lower heomolytic activity (1.7%) to human blood i.e. less toxicity [49].…”

“…Many studies have investigated the anti-oxidant activity of silver nanoparticles from various medicinal plants, e.g. Abutilon indicum [24], Allium sativum, Capsicum frutescens, Cassia occidentalis [49] and Zingiber officinale [15].…”

Plasma-liquid synthesis of silver nanoparticles and their antibacterial and antifungal applications

“…Noble metal nanoparticles owing to their contribution in a variety of fields, including medical [1,2], electronics [3,4], plasmonics [5][6][7], catalysis [8,9] and optics [10,11] are currently capturing the attention of researchers. Noble metal nanoparticles attain amazing capabilities when their electrical, optical, and chemical properties are varied by tuning their size, shape, composition, and local environment [12].…”