Abstract
This work describes an environmental-friendly preparation of ZnO nanoparticles using aqueous oat extract. The advanced electrochemical and optical features of green synthesized ZnONPs displayed excellent antibacterial activity and exhibited an important role in pharmaceutical determinations. The formation of nanoscale ZnO was confirmed using various spectroscopic and microscopic investigations. The formed nanoparticles were found to be around 100 nm. The as-prepared ZnONPs were monitored for their antibacterial potential against different bacterial strains. The inhibition zones for ZnONPs were found as Escherichia coli (16 mm), Pseudomonas aeruginosa (17 mm), Staphylococcus aureus (12 mm) and Bacillus subtilis (11 mm) using a 30-µg mL−1 sample concentration. In addition, ZnONPs exhibited significant antioxidant effects, from 58 to 67%, with an average IC50 value of 0.88 ± 0.03 scavenging activity and from 53 to 71% (IC50 value of 0.73 ± 0.05) versus the scavenging free radicals DPPH and ABTS, respectively. The photocatalytic potential of ZnONPs for Rhodamine B dye degradation under UV irradiation was calculated. The photodegradation process was carried out as a function of time-dependent and complete degradation (nearly 98%), with color removal after 120 min. Conclusively, the synthesized ZnONPs using oat biomass might provide a great promise in the future for biomedical applications.
Highlights
The present study suggests a clean and simple, safe and cost-effective approach for the green synthesis of Zinc oxide nanoparticles (ZnONPs) using oat biomass
The resulted metal oxide nanoparticles were characterized using several spectroscopic and microscopic analysis to prove the formation of ZnONPs
The results reveal the preparation of ZnONPs with a particle size of around 100 nm
Summary
Especially metal oxide nanostructures, are known as a distinctive group of nanopaerticles with unique physicochemical properties and possess broad applications in various scientific areas such as sensing technology [1,2], cell adhesion and tissue engineering [3], industrial packaging [4,5] catalysis [6,7] and biomedical investigations [8,9]. A considerable need to progress eco-friendly, compatible, profitable, energy-efficient, green synthesis methods to avoid the use of toxic materials in the synthesis of nanoparticles [22] To defeat these drawbacks, natural substances (marine algae, bacteria and plants) display excellent potential materials for the green preparation of metallic oxide nanosized. The superiority of utilizing biomasses of plants in the preparation of ZnONPs is simple accessibility and the fact that they are eco-friendly and mostly safe [23] These plants contain various types of biomolecules, such as phenolic compounds, terpenoids, acids and alkaloids, which can potentially act as reducing and stabilizing substances in the preparation of nanostructured metal oxides [24]. Considering the curing efficiency of metal oxide nanostructures synthesis, especially ZnONPs using natural biomasses (plant extracts), the objective of the present work is the eco-friendly synthesis and characterization of ZnONPs using oat biomass as a natu of 19 ral reducing agent. The biomedical potential of the prepared ZnONPs was separately investigated for antibacterial, antioxidant and photocatalytic properties
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