Abstract
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•NiO nanoparticles were synthesized by onion extract (green synthesis) as well as by quercetin (chemical method.•The comparative study shows that quercetin solution works as reducing and capping agent for the synthesis of NiO NPs.•The synthesized compounds were characterized by using XRD, U/V/Vis spectroscopy, SEM and EDX.•NiO nanoparticles were used against bacterial strains.•Remarkable antibacterial activity of NiO nanoparticles.
In this article the NiO nanoparticles were synthesized by onion extract (green synthesis) as well as by quercetin (chemical method) which were synthesized successfully. Quercetin is one of the major phytochemical of red onion which was studied separately (as chemical) and in onion extract for the synthesis of NiO NPs. The comparative study shows that quercetin solution works as reducing and capping agent for the synthesis of NiO NPs meanwhile extraction of onion works in the same way. The characterization techniques as like XRD, UV/Vis spectroscopy, SEM and EDX were used, which shows that the synthesis results of chemical method was better than green synthesis. Antibacterial activity was done through disc diffusion method to observe the sensitivity of bacterial (Staph. Aureus, E.coli) strains.