Green synthesis of silver nanoparticles using water extract of Salvia leriifolia: Antibacterial studies and applications as catalysts in the electrochemical detection of nitrite

Abstract

Here, a green method is described for the biosynthesis of Ag nanoparticles (Ag NPs) using aqueous extracts of the leaf of Salvia leriifolia as reducing and stabilizing agent. Various techniques such as scanning electron microscopy (SEM), atomic force microscopy (AFM), transmission electron microscopy (TEM) and X‐ray diffraction (XRD) were employed for the characterization of the structure and morphology of bio‐synthesized AgNPs. The results reveal that AgNPs synthesized with uniform spherical morphology and average diameters of 27 nm. The AgNPs as a green and efficient heterogeneous catalyst presented superior antibacterial activity. Direct electrochemistry studies of the synthesized AgNPs confirmed that nanoparticles retained their direct electrochemical activity. This is mainly attributed to the proper biosynthesis process, the large specific surface area and the good conductivity of the synthesized nanoparticles. Hence, the present synthesized AgNPs displayed good electrocatalytic activity to the reduction of nitrite ions. The proposed method is highly recommended as a novel platform for the development of electrochemical sensors which can further expand the applications of AgNPs. Antibacterial activity of the synthesized AgNPs was evaluated against nine microorganisms. AgNPs prevented the growth of all selected bacteria. The nanoparticles inhibited the growth of Pseudomonas aeruginosa, Klebsiella pneumonia, Staphylococcus coagulase, Acinetobacter baumannii, and Streptococcus pneumonia more than antibiotic of vancomycin, however, the ability of AgNPs against Echerishia coli and Serratia marcescens was less than the antibiotic. On the other hand AgNPs were active against Citrobacter frurdii, while the antibiotic was inactive.

Chemical characterization and anti‐hemolytic anemia potentials of tin nanoparticles synthesized by a green approach for bioremediation applications

“…A tendency for aggregation of the synthetic nanoparticles is also observed. This property of metallic nanoparticles such as SnNPs, SnNPs, CdNPs, CuNPs, AgNPs, and TiNPs that were synthesized using environmentally friendly methods has previously reported . The particle size diameter for SnNPs was on average 18.12 nm.…”

Effect of gold nanoparticles synthesized using the aqueous extract ofSatureja hortensisleaf on enhancing the shelf life and removingEscherichia coliO157:H7 andListeria monocytogenesin minced camel's meat: The role of nanotechnology in the food industry

“…A tendency for aggregation of the synthetic nanoparticles can also be seen. This property of metallic nanoparticles, such as AuNPs, TiNPs, AgNPs, CuNPs, CdNPs, and FeNPs, that are synthesized using environmentally friendly methods has been described previously …”

“…For example, the peaks at 1020 and 1101 cm −1 could be ascribed to C–O and C–O–C stretching, the peaks at 3426 and 3762 cm −1 relate to O–H and aliphatic C–H stretching, and the peaks in the range 1629–1712 cm −1 correspond to C=C and C=O stretching. These peaks could be considered to indicate the presence of flavonoid, phenolic, and carboxylic compounds, which have been found previously . In agreement with our study and according to previous reports, chemical and biological molecules can be bound to metallic nanoparticles through hydroxyl and carbonyl of biomolecules as reducing, stabilizing, and dispersing agents…”

Characterization and anti‐acute T cell leukemia properties of silver nanoparticles synthesized by a green approach for bioremediation applications: Introducing a new chemotherapeutic drug for clinical trial studies

“…A tendency for aggregation for the synthetic nanoparticles as well as is observed. This property of metallic nanoparticles such as AuNPs, FeNPs, CdNPs, CuNPs, AgNPs, and TiNPs that were synthesized using environmentally friendly methods has previously reported . The pictures also approve uniformity, well dispersed and homogeneous of the biosynthesized AgNPs.…”