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In this study, zinc oxide nanoparticles (ZnONPs) were synthesized using Punica granatum peel extract in onestep reaction at room temperature. Zinc oxide nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), ultraviolet visible spectroscopy (UV-vis) and scanning electron microscopy (SEM). The UV-vis absorption spectrum shows an absorption band at 278 nm due to ZnO nanoparticles. XRD characterized the final product as highly crystalline ZnO with sizes in the range 10-40 nm. The SEM results reveal a presence of network of randomly oriented ZnO nanoplatelets with an average size of 40 nm and thicknesses of about 8 nm. This study determined the effect of zinc oxide nanoparticles on green peach aphid and antibacterial activity.

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The present study deals with rapid, green method and large-scale synthesis of magnetite nanoparticles (Fe3O4NPs) by Uncaria tomentosa leaves aqueous extract at ambient temperature. Crystal growth of magnetite nanoparticles using the processor; ferrous chloride (FeCl2), ferric chloride (FeCl3) and U. tomentosa leaves aqueous extract was formed within 5min at room temperature. Fe3O4NPs synthesized using prucessor FeCl2 have advantage due to U. tomentosa acts as partial oxidizing agent Fe(II) to Fe(III) and then reducing agent to form magnetite nanoparticles (FeO.Fe2O3) and at the same time gave smaller average particle size 20nm. Synthesized Fe3O4NPs were characterized by Ultraviolet visible spectrophotometer (UV-vis), Fourier transform infrared spectroscopy (FT-IR), Transmission electron microscopy (TEM), and X-ray diffraction (XRD). Magnetite nanoparticles showed better green peach aphid activity than reference.

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