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.Graphical abstract
Highlights
The combination of nanotechnology and biological science has been created a new path for the researchers to exploit in various biological fields
Tauc plot is shown in Fig. 1b and the band-gap energy was calculated as 2.8 eV for zinc oxide nanoparticles (ZnO NPs) synthesized using B. tomentosa leaf extract which was in good agreement with the result reported by Khuili et al [17]
Zinc oxide nanoparticles were successfully synthesized by biogenic route using B. tomentosa leaf extract
Summary
The combination of nanotechnology and biological science has been created a new path for the researchers to exploit in various biological fields. The alternative method to synthesize nanoparticles in an eco-friendly, biocompatible, safe, and cost-effective is green approach, which allows large-scale production of nanoparticles through bacteria, fungi, algae, and plants Different plant parts such as root, stem, leaf, flowers, and fruits are rich in phytochemical substances and act as a stabilizing and reducing agent in the production of nanoparticles [8,9,10]. Tauc plot (αhν versus hν) is shown in Fig. 1b and the band-gap energy was calculated as 2.8 eV for ZnO NPs synthesized using B. tomentosa leaf extract which was in good agreement with the result reported by Khuili et al [17]. Due to the presence of alkaloids, terpenoids, flavonoids, tannins, carbohydrates, sterols, saponins, proteins, and amino acids in B. tomentosa leaf extract showed potential bioreducing activity and bactericidal activity against the tested bacteria which could be useful for biomedical applications
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