study of copper and purine-copper complexes on modified carbon electrodes by cyclic and elimination voltammetry研究铜和purine-copper复合物改性碳电极循环伏安法消除.pdfVIP

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study of copper and purine-copper complexes on modified carbon electrodes by cyclic and elimination voltammetry研究铜和purine-copper复合物改性碳电极循环伏安法消除.pdf

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study of copper and purine-copper complexes on modified carbon electrodes by cyclic and elimination voltammetry研究铜和purine-copper复合物改性碳电极循环伏安法消除

Sensors 2008, 8, 429-444 sensors ISSN 1424-8220 © 2008 by MDPI /sensors Full Paper Study of Copper and Purine-Copper Complexes on Modified Carbon Electrodes by Cyclic and Elimination Voltammetry Libuse Trnkova 1,*, Lenka Zerzankova 1, Filip Dycka 1, Radka Mikelova 1 and Frantisek Jelen 2 1 Department of Chemistry, Faculty of Science, Masaryk University, Kotlarska 2, 611 37 Brno, Czech Republic 2 Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Kralovopolska 135, Brno 612 65, Czech Republic * Author to whom correspondence should be addressed; E-mail: libuse@chemi.muni.cz Received: 30 December 2007 / Accepted: 15 January 2008 / Published: 24 January 2008 Abstract: Using a paraffin impregnated graphite electrode (PIGE) and mercury-modified pyrolytic graphite electrode with basal orientation (Hg-PGEb) copper(II) and Cu(II)-DNA purine base solutions have been studied by cyclic (CV) and linear sweep voltammetry (LSV) in connection with elimination voltammetry with linear scan (EVLS). In chloride and bromide solutions (pH 6), the redox process of Cu(II) proceeded on PIGE with two cathodic and two anodic potentially separated signals. According to the elimination function E4, the first cathodic peak corresponds to the reduction Cu(II) + e- → Cu(I) with the possibility of fast disproportionation 2Cu(I) → Cu(II)+ Cu(0). The E4 of the second cathodic peak signalized an electrode process controlled by a surface