Electrochemical sensor for electrochemically inactive β-D(+)-glucose using α-cyclodextrin template molecules

被引:71
作者
Choi, SJ
Choi, BG
Park, SM [1 ]
机构
[1] Pohang Univ Sci & Technol, Dept Chem, Pohang 790784, Kyungbuk, South Korea
[2] Pohang Univ Sci & Technol, Ctr Integrated Mol Syst, Pohang 790784, Kyungbuk, South Korea
关键词
D O I
10.1021/ac0107913
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
We report an electrochemical sensor for an electrochemically inactive organic compound using a self-assembled monolayer (SAM) formed on the gold surface from a solution of thiolated alpha-cyclodextrin (alpha-CD). The SAM makes up an array of ultramicroelectrodes, which capture electroactive molecules such as those of ferrocene. When this SAM-modified electrode is Exposed to a solution containing an electrochemically inactive compound, e.g., glucose, the captured ferrocene molecules are replaced by the electroinactive molecules via an equilibrium established between the two compounds, lowering the current for ferrocene oxidation. The decrease in current is directly proportional to the amount of glucose added and the glucose can be analyzed up to similar to0.80 mM, which is similar to1/10 of a typical physiological concentration in blood serum. Formation constants of the surface-bound alpha-CD molecules with ferrocene and glucose are also reported.
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页码:1998 / 2002
页数:5
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