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The synthesis of nanoparticles using biological molecules has become one of the current research areas due to the high toxic content, poor stability, and expensive production technologies of nanoparticles synthesized by physical and chemical technologies. With the approach called green synthesis, nanoparticles that do not contain toxic substances have been produced in a method that does not harm the environment and human health. The number of polyphenol compounds in the ethyl alcohol/water extract of propolis collected from the Muğla-Türkiye region was determined. The synthesis and characterization of silver nanoparticles were carried out using the ethyl alcohol/water extract of propolis. The descriptions of the synthesized nanoparticles were made using ultraviolet-visible absorption and attenuated total reflection-Fourier transform infrared. Scanning electron microscopy, energy-dispersive X-ray, and X-ray diffraction methods were used for morphological examinations. Which polyphenol compound in the propolis content is effective in the synthesis of nanosilver particles was investigated with a Gaussian 16 package program. The electronic properties of the compounds were obtained by density functional theory using boundary orbitals theory, molecular electrostatic surface potential, and nonlinear optical properties. Epigallocatechin gallate, Kaempferol, and Quercetin are effective in obtaining nano-Ag and can be used as organic optical material in technology. [ABSTRACT FROM AUTHOR]

Quercetin and its metal complexes have anti-oxidation, antibacterial, anti-tumor, and kinds of enzymatic activities. Studies in recent years, these activities are very important for health and pharmaceutics. The purpose of this manuscript is to determine the structure-activity relations and antioxidant properties of the Quercetin and Quercetin-Co2+ chelate from a theoretical view and to be used these compounds in the treatment of the diseases. We found that Quercetin is more stable than Quercetin-Co2+ chelate but Quercetin-Co2+ chelate is more conductive and the O22-H bond of the Quercetin molecule has the highest antioxidant activity. The remarkable electron delocalization occurred between the donor (C17-C19) anti bond and acceptor (C13-C15) anti bond with 319.62 kcal/mol stabilization energy in Quercetin. [ABSTRACT FROM AUTHOR]