Green Synthesis of Silver Nanostructures Using Aqueous Extract of Dracocephalum kotschyi and Evaluation of Antioxidant Properties of Herbal Extracts and Antibacterial Feature of Green- Synthesized Nanostructures | Bentham Science

摘要

Background: Silver nanoparticles have a profound role in the field of high sensitivitybiomolecular detection, catalysis, biosensors and medicine. In the present study,aqueous extract of Dracocephalum kotschyi has been used for the synthesis of silvernanoparticles.Objective: In this study, we evaluated the antioxidant features and the possibility of biosynthesisof AgNPs using an aqueous extract of Dracocephalum kotschyi and also evaluated theantibacterial activities of the synthesized nanoparticles.Methods: An eco-friendly and cost-effective protocol for the synthesis of Ag nanoparticles byutilizing a renewable natural resource, aqueous solution of Dracocephalum kotschyi, wasproposed. Synthesized nanoparticles were characterized by UV–Vis spectroscopy, SEM,EDS, and XRD pattern.Results: At first, the extract of Dracocephalum kotschyi was assessed to determine and confirmthe presence of an antioxidant feature. Resuscitation of one mM silver nitrate solutionwas carried out by the herbal extract. The solution containing AgNPs obtained from greensynthesis had a maximum optical density at 225 nm. In addition, the presence of AgNPs wasapproved by energy-dispersive X-ray spectroscopy (EDS). Images of the scanning electronmicroscope demonstrated that the synthesized AgNPs had the shape of rods and the size distributionof 48-51 nm. One of the benefits of this method is a uniform size distribution.Moreover, the effects of reaction time and concentration of the herbal extract were assessedby ultraviolet-visible (UV-Vis) spectroscopy. In the end, we assessed the antibacterial impactof the synthesized AgNPs against some pathogenic bacterial strains. According to the results,the produced nanostructures had a proper impact on two bacteria of Escherichia coli andStaphylococcus aureus.Conclusion: According to the results of the present study, Dracocephalum kotschyi can be asuitable compound for the synthesis of nanostructures due to its indigenous cultivation andgreat medicinal properties.