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Yayınlar
- Derleme MakaleAçık Erişim2026Scopus SJRQ2Sustainable Ammonia Production, Advances in Electrochemical, Photoelectrochemical, and Photocatalytic Technologies for Green Energy
Shahin, Musarat; Mohsin, Abdul Haseeb; Bibi, Aiman; Ahmad, Ihtisham; Altuner, Elif Esra; Aldemir, Ozan; Durmusoglu, Senol; Yilancilar, Mehmet Sabit; Tanriverdi, Yavuz; Acar, Esra
Substantial advances have been made since the 1970s in reducing the environmental impacts of ammonia production. Renewable-driven electrochemical synthesis offers a promising pathway to decarbonize ammonia production. This review examines an integrated route in which hydrogen is generated photoelectrochemically under concentrated solar irradiation and subsequently used in electrochemical ammonia synthesis. Photoelectrochemical cells are fabricated by electrostatically depositing photosensitive particles onto cathodes to enhance light-driven hydrogen production. Hydrogen production rates and ammonia yield depend strongly on temperature and electrolyte composition. The synthesized hydrogen is fed into a molten salt electrochemical reactor that operates at atmospheric pressure and receives nitrogen from a dedicated supply. This combined solar–electrochemical approach can produce low-carbon ammonia with improved safety and reduced environmental impact, offering a scalable alternative to conventional processes.
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İncele - MakaleYalnız künye2026Scopus SJRQ3Biogenic Silver Nanoparticles from Citrus reticulata Peels for Ultrasensitive Electrochemical Sensing of 4-Aminobenzenesulfonamide
Dar, Umar Ali; Altuner, Elif Esra; Akocak, Suleyman; Issa, Ghassan; Ozalp, Veli Cengiz
Increasing utilization of sulfonamide derivatives as antibacterial agents has created serious challenges in terms of environmental pollution and antimicrobial resistance. In this respect, there is a compelling need for a highly sensitive and selective analytical tool for detecting such antibiotics in trace concentrations. This work represents a green strategy for developing an electrochemical biosensor for the determination of 4-aminobenzenesulfonamide based on bio-functionalized silver nanoparticles (Ag NPs) prepared from peel extract of Citrus reticulata fruit. The phytochemicals present in the peel extracts played a dual role of reduction and stabilization during the synthesis of Ag NPs. Synthesized NPs were well characterized through scanning electron microscopy (SEM), X-ray diffraction (XRD), Ultraviolet spectroscopy (UV–Vis), and Fourier infrared spectroscopy (FTIR) techniques. The Ag NPs showed considerable improvement in electrocatalysis in comparison to the bare glassy carbon electrode. The fabricated sensor gave an excellent linear calibration curve with a high value of R2 (=0.999), along with a low limit of detection (LOD = 0.65 µM) and limit of quantification (LOQ = 2.1 µM).
- MakaleAçık Erişim2026Scopus SJRQ1Circulating Ghrelin, Nesfatin-1, and Vaspin Levels Across Glycemic Control Categories in Type 2 Diabetes Mellitus: A Cross-Sectional Study
Akkus, Suheda; Saricam, Orkun; Kavruk, Murat; Sariyildiz, Gulcin Turkmen; Benguboz, Fatma Busra; Sirin, Berna Yilmaz; Altuner, Elif Esra; Dursun, Ali Dogan; Ozalp, Veli Cengiz
Background/Objectives: Diabetes mellitus is characterized by chronic hyperglycemia, insulin resistance, and low-grade inflammation, and adipose-tissue-derived adipokines are increasingly implicated as regulators of glucose homeostasis. This study compared circulating ghrelin, nesfatin-1, and vaspin levels across three glycemic-control categories defined by HbA1c and evaluated their association with glycemic status. Methods: In this cross-sectional comparative study, serum ghrelin, nesfatin-1, and vaspin were measured by enzyme-linked immunosorbent assay (ELISA) in 161 adults stratified into three groups: HbA1c 6.0–8.4% (n = 55), HbA1c ≥ 8.5% (n = 52), and non-diabetic controls with HbA1c < 6.0% (n = 54). Distributional assumptions were tested with the Kolmogorov–Smirnov and Shapiro–Wilk tests. Because all three adipokines deviated from normality, the primary omnibus comparison was the Kruskal–Wallis test, followed by Dunn’s post hoc test with Bonferroni adjustment; effect sizes are reported with 95% confidence intervals. Group differences were additionally examined after adjustment for age and sex, and HbA1c was analysed as a continuous variable. Results: Ghrelin (Kruskal–Wallis p = 0.726) and vaspin (p = 0.364) did not differ among the three groups. Nesfatin-1 differed significantly (H = 15.16, p < 0.001, ε2 = 0.095) and non-monotonically: concentrations were higher in the HbA1c 6.0–8.4% group than in controls (median 824 versus 650 pg/mL; Dunn p = 0.018) and than in the HbA1c ≥ 8.5% group (824 versus 600 pg/mL; p < 0.001), whereas the HbA1c ≥ 8.5% and control groups did not differ (p = 0.909). The nesfatin-1 difference persisted after adjustment for age and sex (p < 0.001) and after excluding controls with impaired fasting glucose (p < 0.001). Within the diabetic participants, nesfatin-1 correlated inversely with continuous HbA1c (ρ = −0.373, p < 0.001). Conclusions: Nesfatin-1, but not ghrelin or vaspin, differed significantly between HbA1c-defined glycemic-control categories in a non-monotonic manner, with the highest concentrations in the intermediate-HbA1c group. Because body mass index, diabetes duration, and antidiabetic medication were not available, and because the design is cross-sectional, these between-group differences cannot be interpreted as a within-person trajectory or attributed to glycemic status independently of adiposity. These exploratory findings require confirmation in larger, prospective, BMI- and medication-adjusted cohorts before nesfatin-1 can be considered a candidate biomarker.