Abstract
Green synthesis of nanoparticles is considered economical and ecofriendly because it does not use chemical reducing agent and produces biocompatible nanostructures. This study describes the synthesis of silver nanoparticles (AgNPs) from Campsis radicans and Cascabela thevetia petal aqueous extracts. Characterization of NPs was performed by XRD, FTIR and SEM. The phytochemical contents, antioxidant, antibacterial potential, and enzyme inhibition potential were also determined. The size of AgNPs synthesized from C. radicans (CrAg) was 8.58 nm and synthesized form C. thevetia (CtAg) was 13.88 nm. FTIR confirmed the attachment of different functional groups on surface of nanoparticles while SEM analysis depicted spherical shape of synthesized AgNPs. In phytochemical analysis, CtAg NPs quantified higher amount of gallic acid equivalent phenolic like activity (20.1 ± 0.83 μgGAE/mg) and quercetin equivalent flavonoid like content (10.6 ± 0.85 μgQE/mg) due to attachment of different functional groups on the surface of NPs. The antioxidant potential of CrAg NPs was 53.5 ± 0.81 μgAAE/mg and reducing potential was 50.3 ± 0.85 μgAAE/mg. In case of DPPH, CtAg NPs showed higher radical scavenging potential. In antibacterial studies, prominent zones of inhibition were observed against all the bacterial strains by both NPs. CrAg NPs showed 77.3% lipase inhibition and 75.1 ± 0.65% urease inhibition. The catalytic activity of CtAg NPs (0.4 ± 0.25 mM/min/mg) was slightly greater than CrAg NPs (0.3 ± 0.21 mM/min/mg). The study concludes that Campsis and Cascabela species flowers have significant potential to synthesize metallic nanoparticles with prominent biological activities that can be further applied in different fields.
Published Version
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