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Radiolytic synthesis and characterization of selenium nanoparticles: comparative biosafety evaluation with selenite and ionizing radiation

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Abstract

The goal of this work is use a green chemistry route to synthesize selenium nanoparticles (SeNPs) that do not trigger oxidative stress, typical of metallic, oxide metallic and carbonaceous nanostructures, and supply the same beneficial effects as selenium nanostructures. SeNPs were synthesized using a radiolytic method involving irradiating a solution containing sodium selenite (Se4+) as the precursor in 1% Yeast extract, 2% Peptone, 2% Glucose (YPG) liquid medium with gamma-rays (60Cobalt). The method did not employ any hazardous reducing agents. Saccharomyces cerevisiae cells were incubated with 1 mM SeNPs for 24 h and/or then challenged with 400 Gy of ionizing radiation were assessed for viability and biomarkers of oxidative stress: lipid peroxidation, protein carbonylation, free radical generation, and total sulfhydryl content. Spherical SeNPs with variable diameters (from 100 to 200 nm) were formed after reactions of sodium selenite with hydrated electrons (eaq) and hydrogen radicals (H·). Subsequent structural characterizations indicated an amorphous structure composed of elemental selenium (Se0). Compared to 1 mM selenite, SeNPs were considered safe and less toxic to Saccharomyces cerevisiae cells as did not elicit significant modifications in cell viability or oxidative stress parameters except for increased protein carbonylation. Furthermore, SeNPs treatment afforded some protection against ionizing radiation exposure. SeNPs produced using green chemistry attenuated the reactive oxygen species generation after in vitro ionizing radiation exposure opens up tremendous possibilities for radiosensitizer development.

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Funding

The authors would like to thank CDTN/CNEN (Centro de Desenvolvimento da Tecnologia Nuclear/Comissão Nacional de Energia Nuclear (Grant No. 0585.05.02), FAPEMIG (Grant No. CBB-APQ-00180-16) for their financial support. AG Pereira and LS Gonçalves received a scholarship from CNEN and LGL Gerolis from CAPES.

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AGP conceived, designed and conducted experiments; LGLG and LMCM conducted experiments, analyzed and interpreted data; LSG analyzed and interpreted data and participated in manuscript redaction; PLG performed the XPS experiments and analyzed and interpreted data; MJN conceived, designed and wrote the manuscript. All authors have reviewed and approved the final version of the manuscript.

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Correspondence to Maria Jose Neves.

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Pereira, A.G., Gerolis, L.G.L., Gonçalves, L.S. et al. Radiolytic synthesis and characterization of selenium nanoparticles: comparative biosafety evaluation with selenite and ionizing radiation. World J Microbiol Biotechnol 38, 33 (2022). https://doi.org/10.1007/s11274-021-03218-9

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  • DOI: https://doi.org/10.1007/s11274-021-03218-9

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