Yazar "Gunes, Mehmet" seçeneğine göre listele

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    Flow injection amperometric determination of NADH at a calmagite-modified pencil graphite electrode
    (Springer Wien, 2019) Gunes, Mehmet; Dilgin, Yusuf
    In this study, an aromatic sulfonic dye, Calmagite (Calm) was electropolymerized on a pencil graphite electrode (Poly-Calm/PGE) to investigate the electrocatalytic oxidation and flow injection (FI) amperometric detection of NADH. Cyclic voltammetric studies show that Poly-Calm/PGE exhibits a high electrocatalytic activity towards the oxidation of NADH. Then, determination of NADH was performed at Poly-Calm/PGE using FI-amperometric technique with a homemade flow cell which was fabricated for PGEs. FI-amperometric measurements showed that linear response of NADH was found between 0.10 and 100.0 mu M. Detection limit was found as 0.03 mu M (based on 3 S-b/m) at Poly-Calm/PGE. This study is the first one for FI-amperometric analysis of NADH using Poly-Calm/PGE which provides a simple, low cost, and sensitive determination of NADH. The proposed sensor can be a good alternative method for determination of NADH and construction of a biosensor based on dehydrogenase enzyme in future. [GRAPHICS] .
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    Highly Sensitive Square Wave Voltammetric Determination of Sunset Yellow at a functionalized-MWCNTs/poly(Alizarin Red-S) Composite Modified Electrode
    (Wiley-V C H Verlag Gmbh, 2022) Gunes, Mehmet; Karakaya, Serkan; Dilgin, Yusuf
    This work presents an effective and highly sensitive electrochemical detection of Sunset Yellow (SSY) at poly(Alizarin Red-S) and functionalized multi-walled carbon nanotubes composite modified glassy carbon electrode (f-MWCNTs/poly(ALR-S)/GCE). The electrochemical response of the f-MWCNTs/poly(ALR-S)/GCE towards SSY was examined by cyclic voltammetry (CV) and square wave voltammetry (SWV). Both recorded cyclic voltammograms (CVs) and square wave voltammograms (SWVs) showed that the oxidation/reduction peaks of SSY at f-MWCNTs/poly(ALR-S)/GCE were found to be much higher than the bare GCE, f-MWCNTs/GCE, and poly(ALR-S)/GCE. Calibration curves obtained from the SWVs indicated that the f-MWCNTs/poly(ALR-S)/GCE offers a linear response in the range of 0.50 to 256 mu M with a low detection limit (LOD) of 0.16 mu M and the sensitivity was found to be 9686 mu A mM(-1) cm(-2). The f-MWCNTs/poly(ALR-S)/GCE provides excellent performance for the detection of SSY in daily life samples with high accuracy and precision.