Biosynthesis, characterization, and antibacterial activity of zinc oxide nanoparticles derived from Bauhinia tomentosa leaf extract

Abstract

A facile, eco-friendly synthesis of zinc oxide nanoparticles (ZnO NPs) employing Bauhinia tomentosa leaf extract as bioreducing agent was reported. The green-synthesized ZnO NPs were characterized by UV-Vis, TEM, EDX, XRD, and FTIR analyses. The formation of ZnO NPs was confirmed by the appearance of characteristic SPR peak at 370 nm due to the collective oscillation of electrons in the conduction band in UV-Vis spectra. The hexagonal morphology exhibiting nanosized ZnO was observed from the TEM and XRD analyses. The chemical bonds present in the as-synthesized ZnO NPs were identified by FTIR analysis. ZnO NPs showed a significant antibacterial activity against Gram-negative bacteria P. aeruginosa and E. coli than Gram-positive bacteria. Results of this study demonstrated that B. tomentosa leaf extract containing phytochemicals such as alkaloids, terpenoids, flavonoids, tannins, carbohydrates, and sterols possess bioreducing property for ZnO synthesis and the obtained ZnO NPs could be employed effectively as a better bactericidal agent for biological applications.

Microbial Fabrication of Zinc Oxide Nanoparticles and Evaluation of Their Antimicrobial and Photocatalytic Properties

“…The XRD spectrum line extension of diffraction peaks is an indication of the nano-meter range of the synthesized products, moreover, the diffraction peaks from other metal species was absent suggesting the synthesized ZnO nanoparticles are free from any other impurities. Similar results of the XRD analysis of ZnO nanoparticles synthesized by using biological material are in close agreement with multiple studies (Azizi et al, 2014;Nazir et al, 2018;Sharmila et al, 2018).…”

One-pot green synthesis of iron oxide nanoparticles from Bauhinia tomentosa: Characterization and application towards synthesis of 1, 3 diolein

“…The aqueous extract of Bauhinia tomentosa leaves and 0.01 M FeCl 3 solution were combined to effectuate the synthesis of iron (II) oxide nanoparticles. The extract was prepared by soaking the leaves in distilled water for 24 h 22 . The freshly prepared 0.01 M FeCl 3 solution was added dropwise to the leaf extract in a 1:1 ratio with continuous stirring.…”

Synthesis and characterization of zinc oxide nanoparticles by using polyol chemistry for their antimicrobial and antibiofilm activity

“…According to Pratap et al, ZnO synthesized by using green route Coriandrum sativum leaf extract exhibit antibacterial activity at concentration more than 100 mg/ml [59] . Sharmila et al, demonstrated antibacterial activity of ZnO nanoparticles (22–93 nm) synthesized through green route Bauhinia tomentosa leaf extract, which showed antibacterial activity against Gram positive and Gram negative bacteria [60] . Several reports suggest that the action of ZnO on bacterial species is due to release of reactive oxygen species (ROS) species and zinc ions.…”