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An electrochemical biosensor based on human serum albumin/graphene oxide/3-aminopropyltriethoxysilane modified ITO electrode for the enantioselective discrimination of d- and l-tryptophan
Scopus
Toplam 120 atıf DOI
A new electrochemical biosensor based on the human serum albumin/graphene oxide/3-aminopropyltriethoxysilane modified indium tin oxide electrode (ITO/APTES/GO/HSA) has been developed for the discrimination of tryptophan (Trp) enantiomers. The electrode has been characterized by scanning electron microscopy (SEM) and electrochemical techniques. The electrochemical behaviors of the enantiomeric pairs (d- and l-Trp) at the ITO/APTES/GO/HSA electrode have been investigated by cyclic voltammetry in the concentration range of 0.10-1.0. mM. A clear separation between the oxidation peak potentials of d- and l-Trp, at 0.86 and 1.26. V, respectively, has suggested that the ITO/APTES/GO/HSA electrode can be used as an electrochemical biosensor for the discrimination of Trp enantiomers. In order to find the percentage of an enantiomeric form of tryptophan in a mixture, the ITO/APTES/GO/HSA electrode is used for the simultaneous detection of d- and l-Trp which showed that the percentage of one enantiomeric form can be easily measured in the presence of the other. © 2012 Elsevier B.V.
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In Situ Copper Nanoparticles on Reduced Graphene Oxide (rGO/Cu) for Biphasic Hydrogen Evolution
Scopus
Havuzumuzda 9 atıf almış
Graphene-based nanocomposites have attracted a tremendous attention, showing excellent performance in energy conversion applications, such as reduction of carbon dioxide and hydrogen evolution reaction (HER). Herein, a study on in situ generation Cu nanoparticles on reduced graphene oxide (rGO/Cu) by reducing simultaneously both graphene oxide and Cu2+ ions during the biphasic HER by organic sacrificial agent decamethylferrocene (DMFc) was reported. The in situ-generated rGO/Cu catalyst was morphologically and structurally characterized by microscopic and spectroscopic techniques, respectively. The hydrogen evolution catalytic activity of rGO/Cu was investigated by using 4-electrode voltammetry and two-phase reaction methods. rGO/Cu nanocomposite catalyst displayed a better catalytic activity than the non-catalyzed reaction and free-Cu catalyst by enhancing the HER rate approximately 208- and 3-times, respectively. The HER activity of rGO/Cu gave results comparable to the noble metallic and the other nanocomposite catalysts such as Pt, Pd, MoSx and their nanocomposites with carbon-based materials.
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Kurumlar (1)
Selçuk Üniversitesi
Selçuklu, Turkey