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Monodispersed cerium oxide nanoparticles (CeO 2 NPs) with positive and negative surface potential were synthesized by co-precipitation method using hexamethylenetetramine (HMT) and poly(vinylpyrrolidone) (PVP), respectively, as precipitating agents. Synthesized NPs were characterized with scanning electron microscopy (SEM), UV-Visible (UV-Vis) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, and powder X-ray diffraction (XRD). Positively charged NPs of about 30 ± 10 nm in size formed within 5 h, aggregated in number, and resulted in larger-sized NPs as a function of time. The CeO 2 NPs were administered to Drosophila as a part of their diet to study the effects on the growth and development of Drosophila . While the positively charged NPs did not affect the growth of the third instar larvae, the negatively charged NPs delayed the growth of larvae by about 7 days. It required 7 more days to reach the stage of adult fly. TEM imaging of the larvae gut showed that positively charged NPs were found to be smaller, whereas the size of negatively charged NPs remained unchanged. This biodegradability could be the reason for the delayed larvae growth in the case of negatively charged particles. The distance covered by such second instar larvae fed with diet containing negatively charged CeO 2 NPs was significantly lower, and their size was significantly smaller when compared to the crawling activity and size of the third instar larvae of the control group. Such positively charged NPs have high potential for use as drug delivery carriers for the treatment of disease, and negatively charged NPs may play a rather detrimental role.

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Synthesis of Positively and Negatively Charged CeO<sub>2</sub> Nanoparticles: Investigation of the Role of Surface Charge on Growth and Development of <i>Drosophila melanogaster</i>

Synthesis of Positively and Negatively Charged CeO2 Nanoparticles: Investigation of the Role of Surface Charge on Growth and Development of Drosophila melanogaster

Synthesis of Positively and Negatively Charged CeO₂ Nanoparticles: Investigation of the Role of Surface Charge on Growth and Development of Drosophila melanogaster