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    Green synthesis of zinc oxide nanoparticles including Rosehip (Rosa canina L.) seed extract: Evaluation of its characterization and bioactivity properties
    (Wiley, 2024) Bozkurt, Rabia Nur; Şahin, Selin
    The use of bioactive compounds in plants as reducing, stabilizing, and capping agents in nanoparticle manufacturing is an exceptionally eco-friendly approach. This work used rosehip seed extract, acquired by automatic solvent extraction, in the microwave-assisted green production of zinc oxide nanoparticles (ZnO NPs). The total phenolic content (TPC), total flavonoid content (TFC), and antioxidant activity of the extracted materials and nanoparticles were assessed using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) assays. The ideal synthesis parameters were established as 25 mL of extract, pH 12, 360 W of microwave power, and a metal salt concentration of 0.05 M for a duration of 7 minutes. The characterization of the ZnO NPs synthesized under these conditions was performed using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDX), dynamic light scattering (DLS), zeta potential measurements, and UV-Vis spectrophotometry. High-purity, nano-sized, antioxidant ZnO NPs were manufactured using an ecologically friendly, sustainable, and ecological technique.
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    Tailoring natural solvents: Deep eutectic approach for recovering bioactives from Prunus Spinosa L.
    (Wiley, 2025) Bozkurt, Rabia Nur; Falsafi, Seid Reza; Şahin, Selin
    In this study, several choline chloride (ChCl)-based deep eutectic solvent (DES) combinations were prepared at different molarratios (1/1, 1/2, and 2/1) using amine (urea), polyols (ethylene glycol and glycerol), and carboxylic acids (lactic acid, formic acid,propionic acid, and acetic acid). The performances of the DESs in the homogeniser-assisted extraction of Prunus spinosa L.fresh fruit were compared depending on the total phenolic content (TPC), total anthocyanin content (TAC), and 2,2-diphenyl-1-picrylhydrazyl free radical scavenging activity (antioxidant activity [AA]) yields. Based on the findings of Tukey’s test formultiple comparisons, ChCl/formic acid (2/1) provided the best extraction efficiency with statistically significant differences(p < 0.05). Fourier-transform infrared spectroscopy was used to confirm the formation of the proposed DES. Furthermore, theproposed DES also showed better performance compared to conventional aqueous ethanol (60%, v/v) and water. Then, theselected DES (ChCl/formic acid, 2/1) was employed for the optimization study using the Box-Behnken Design of the responsesurface methodology. The optimum process conditions for the maximum yields of TPC (52.34 mg-GAE/g-FF), TAC (2.09 mg-cyn-3-glu/g-FF), and AA (89.21%) were found to be 50% (v/v) water in the DES, 0.833 g of material, and 69.906 s extractiontime.