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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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    Investigation of photocatalytic degradation of methyl orange using zinc oxide-supported chitosan hydrogel beads
    (Taylor & Francis, 2025) Kaba, İbrahim; Bozkurt, Rabia Nur; Kılıç, Behris
    In this study, chitosan-based ZnO supported hydrogels (CZ–H) were synthesized to evaluatetheir photocatalytic degradation performance against methyl orange (MO) dye. The compos-ite hydrogels were characterized using X-ray Diffraction (XRD), UV–Vis DRS, ScanningElectron Microscopy (SEM-EDS), Thermogravimetric Analysis (TGA), and Fourier TransformInfrared Spectroscopy (FTIR). These characterization results confirmed the successful forma-tion of the CZ–H composite structure. The band gap of the composite was approximately2.77 eV, supporting enhanced photocatalytic activity. Photocatalytic experiments showedthat CZ–H removed 74% of MO within 60 min, compared to 42% for pure chitosan beads,with reaction rate constants of 0.0237 min−1 and 0.0113 min−1, respectively. Moreover, theCZ–H beads demonstrated good reusability with minimal loss in efficiency over multiplecycles. These findings highlight the potential of CZ–H as a stable, effective, and reusablephotocatalyst for the efficient removal of dyes from wastewater.
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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.