淡江大學機構典藏:Item 987654321/54242
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    题名: Development of structure-specific electrochemical sensor and its application for polyamines determination
    作者: Lin, Meng-shan;Chen, Chi-hao;Chen, Zen
    贡献者: 淡江大學化學學系
    关键词: FIA;Structure-specific electrochemical sensor;Polyamine
    日期: 2011-01
    上传时间: 2011-07-04 14:48:57 (UTC+8)
    出版者: Kidlington: Pergamon
    摘要: A novel structure-specific electrochemical sensing scheme to monitor analyte, independent of its oxidation potential, is described. Molecules with multidentate chelating sites that can form stable five- or six-membered ring complexes with cupric ions are appropriate for this approach. In the copper-based electrode, potential-accelerating complex formation behavior is observed, and an apparent oxidation current is induced to regenerate the oxide layer until reaching its maximum steady state. In this unique electroanalytical method, a suitable potential is utilized to increase the coordination number of the metal electrode surface rather than direct oxidation of the analyte. The experimental results show that the signal sensitivity depends primarily on the pKa of the chelating sites and the solution pH. Several aliphatic amines were studied with this simple approach, and the detection limits for spermidine (SPD; 0.19 μM) and spermine (SPM; 0.14 μM) at a low oxidation potential (0.25 V vs. Ag/AgCl) were obtained. A higher operating potential was used to improve the sensitivity for putrescine (PUT) and cadaverine (CAD). The detection limit was improved to 0.05, 0.06, 0.11 and 0.27 μM for SPD, SPM, PUT and CAD, respectively, without surface fouling (less than 3% with RSD). The feasibility of its clinical application is demonstrated by integrating this sensor with high-performance liquid chromatography (HPLC).
    關聯: Electrochimica Acta 56(3), pp.1069–1075
    DOI: 10.1016/j.electacta.2010.10.083
    显示于类别:[化學學系暨研究所] 期刊論文

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