Yazar "Kardas, Faruk" seçeneğine göre listele

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  • [ X ]
    Öğe
    A novel determination of curcumin via Ru@Au nanoparticle decorated nitrogen and sulfur-functionalized reduced graphene oxide nanomaterials
    (Royal Soc Chemistry, 2016) Kotan, Gul; Kardas, Faruk; Yokus, Ozlem Aktas; Akyildirim, Onur; Saral, Hasan; Eren, Tanju; Yola, Mehmet Lutfi
    We report the synthesis of Ru@Au nanoparticle involved L-cysteine functionalized reduced graphene oxide (rGO) composites (NSrGO/Ru@AuNPs). The nanocomposites were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The electrochemical determination of curcumin (CR) has been studied using square wave voltammetry (SWV) on a glassy carbon electrode (GCE) modified with NSrGO/Ru@AuNP composites (NSrGO/Ru@AuNPs/GCE). The effective surface areas (ESAs) of the rGO/GCE and NSrGO/Ru@AuNPs/GCE were calculated to be 347 cm(2) mg(-1) and 1289 cm(2) mg(-1), respectively. These results show that the electrochemical surface area of the NSrGO/Ru@AuNPs/GCE is 3.71 times higher than that of the rGO/GCE. The developed method was also applied successfully for the determination of CR in plasma and the linearity range of CR was 0.001-0.1 nM with a detection limit of 2.0 x 10(-13) M.
  • [ X ]
    Öğe
    Sensitive voltammetric sensor based on polyoxometalate/reduced graphene oxide nanomaterial: Application to the simultaneous determination of L-tyrosine and L-tryptophan
    (Elsevier Science Sa, 2016) Yokus, Ozlem Aktas; Kardas, Faruk; Akyildirim, Onur; Eren, Tanju; Atar, Necip; Yola, Mehmet Lutfi
    In this report, a novel voltammetric sensor based on polyoxometalate (H3PW12040, POM) functionalized reduced graphene oxide (rGO) modified glassy carbon electrode (GCE) was presented for simultaneous determination of L-tyrosine (L-Tyr) and L-tryptophan (L-Trp). The nanocomposites were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The electrochemical determination of L-Tyr and L-Trp has been studied using square wave voltammetry (SWV) on GCE modified with POM-rGO composite (POM-rGOIGCE). The developed method was also applied successfully for the simultaneous determination of L-Tyr and L-Trp in spiked serum sample and the linearity range of L-Tyr and L-Trp was 1.0 x 10(-11) - 1.0 x 10(-9)M with the detection limit of 2.0 x 10(-12)M. (C) 2016 Elsevier B.V. All rights reserved.