Browsing by Author "Yayla, Muge"

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Development of Nonenzymatic Benzoic Acid Detection on Pdsn/Gce Xc-72r Prepared Via Polyol Method
(Wiley-v C H verlag Gmbh, 2019) Kazici, Hilal Celik; Yayla, Muge; Ulas, Berdan; Aktas, Nahit; Kivrak, Hilal
In this study a PdSn based sensor was developed for the determination of benzoic acid (BA) in foods. A carbon (Vulcan XC-72R) supported PdSn catalyst was prepared via polyol method and its surface electronic and chemical properties were investigated by advanced surface analytical techniques such as scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD), X-ray Photoelectron Spectroscopy (XPS), temperature-programmed reduction with H-2 (TPR-H-2) and transmission electron microscopy (TEM). Electrochemical measurements were performed by employing cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques on PdSn/GCE/Vulcan XC-72R electrode. The developed sensor showed a wide linear range up to 10 mM with a 0.77 mu M low limit of detection (LOD) as well as high stability. Further experiments were performed on food samples containing BA to achieve real sample measurements. For real sample measurements, PdSn/GCE/Vulcan XC-72R electrode was used for the determination of BA in different kinds of samples such as mayonnaise, ketchup and carbonated beverages.
An Electrocatalyst for Detection of Glucose in Human Blood: Synergy in Pd-aunps/Gox Surfaces
(Taylor & Francis inc, 2019) Kazici, Hilal Celik; Yayla, Muge
Glucose oxidase (GOx)-based amperometric enzyme electrodes have been the target of substantial research. In this study, new amperometric biosensor for determination of glucose was developed. GOx enzyme was immobilized at bovine serum albumin via entrapment method. For this reason, the optimum conditions of Pd-Au NPs/GOx/C-modified glassy carbon electrode were determined. The electron is directly transferred from glucose to the electrode via the active site of the enzyme. The absence of mediators is the main advantage of such third-generation biosensors. The resulting materials were characterized employing scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction. In addition, the effects of glucose concentration, scan rate, temperature, electroactive interference, stability, reusability of the biosensors were discussed. The applicability to blood analysis was also evaluated. The biosensor has a limit of detection for the determination of glucose 0.0014 mM.