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    A dual-responsive fluorescent sensor for selective detection of cyanide ions and histamine via distinct mechanisms in food samples
    (Elsevier Inc., 2025) Gokbel, Fuat; Eczacioglu, Numan; Gumus, Numan Emre; Aydin, Ziya
    Ensuring food safety requires rapid, sensitive detection of toxic contaminants like cyanide ions and spoilage markers like biogenic amines (BAs). Here, we present FZ-3 (combining 2,3,3-trimethyl-1-propyl-3H-indole-1-ium iodide with a pyridine moiety), a novel dual-sensitive fluorescent sensor that selectively detects cyanide ions (CN−) and histamine (His) through distinct reaction mechanisms. FZ-3 combines an indolium moiety for cyanide ions recognition via nucleophilic addition and, with a chloropyridine unit for His sensing via substitution. With minimal interference from other ions/biogenic amines, the sensor exhibits a turn-on response for CN− ions at 414 nm, while for His it enhances emission with a turn-on response at 463 nm. It demonstrates excellent sensitivity with detection limits of 1.08 μM for CN− and 2.80 μM for His, surpassing many existing single-analyte detection systems. FZ-3's efficacy was validated in food matrices by cyanide ions quantification in bitter almonds (recovery: 85.9–100.8 %) and sprouting potatoes (recovery: 85.4–103.9 %) and His detection in fresh/spoiled anchovies (recovery: 81.4–102.5 %), demonstrating correlation with spoilage levels. Notably, FZ-3 operates at physiological pH (3.9–8.0), requires <20 min for analysis, and surpasses conventional methods in cost, speed, and simplicity. This work advances dual-analyte sensing platforms for real-time food quality monitoring, offering a practical tool for both industrial and regulatory applications. © 2025 Elsevier B.V.
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    Öğe
    A Novel Phenanthroline-Based Colorimetric Turn-Off Optical Sensor for Zn2+
    (Elsevier S.A., 2020) Aydin, Ziya
    In this study, a new Zn2+-selective sensor (PCA) was developed by linking 4-(dimethylamino) cinnamaldehyde with 2,9-dimethyl-1,10-phenanthroline in a one-step reaction. The colorimetric and optical sensing properties of PCA were investigated by utilizing UV–Vis, fluorescence spectroscopy and the naked eye. The sensor PCA displayed high selectivity and sensitivity to Zn2+ over a wide range of the other metal ions in acetonitrile (ACN)/Tris-HCl buffer (10 mM, pH 7.39, v/v 2:1) solution. The sensor showed a clear visual change from yellow to orangish-red with Zn2+. In addition, PCA could detect Zn2+ with fluorescence quenching. The complex (PCA/Zn2+) stoichiometry was found to be 1:1 and the binding constant of the complex was calculated as 1.30 × 106 M?1. PCA displayed a low detection limit (0.835 µM) which is much lower than the value recommended by WHO. PCA was also used to detect Zn2+ in tap water samples using filter paper strips and UV–Vis spectroscopy. © 2020 Elsevier B.V.
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    A new bodipy/pillar[5]arene functionalized magnetic sporopollenin for the detection of Cu(II) and Hg(II) ions in aqueous solution
    (Academic Press Inc Elsevier Science, 2024) Bilgic, Ali; Aydin, Ziya
    In this study, a new bodipy/pillar[5]arene functionalized magnetic MS-Sp-P[5]-bodipy microcapsule sensor was prepared based on the use of environmentally friendly for the selective and sensitive detection of Cu(II) and Hg (II) ions in aqueous media. SEM results used in the characterization process of the materials synthesized at each stage confirmed the structural and morphological changes in the pore structure, while other characterization results (FT-IR and XRD) elucidated the role of pillar[5]arene compound and bodipy dye in the synthesis of magnetic microcapsule sensors. The colloidal solution of MS-Sp-P[5]-bodipy (water/ethanol)) showed two fluorescence bands centered at 402 and 540 nm. The detection limits of MS-Sp-P[5]-bodipy for Hg(II) and Cu(II) were calculated to be 0.06 mu M and 2.27 mu M, respectively (at 540 nm). The linear range of the magnetic sensor for Hg(II) and Cu(II) was found to be in the range of 1-150 mu M and 10-150 mu M, respectively. The experimental results (response time, pH, temperature, sensitivity and selectivity) demonstrated the applicability and potential of the prepared magnetic microcapsule sensor for the detection of Cu(II) and Hg(II) in water and tap water samples containing heavy metal ions.