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DNA-过氧化聚吡咯生物复合膜传感器的分析应用

蒋晓华, 刘伟强, 陈建军   

  1. 深圳清华大学研究院新材料与生物医药研究所, 深圳 518057
  • 收稿日期:2006-06-26 修回日期:1900-01-01 出版日期:2007-03-10 发布日期:2007-03-10
  • 通讯作者: 蒋晓华

Application of DNA-overoxidized Polypyrrole Composite Biosensor

JIANG Xiao-Hua, LIU Wei-Qiang, CHEN Jian-Jun   

  1. Center for Advanced Materials & Biotechnology, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China
  • Received:2006-06-26 Revised:1900-01-01 Online:2007-03-10 Published:2007-03-10
  • Contact: JIANG Xiao-Hua

摘要: 在研究DNA与儿茶酚胺类分子之间相互作用的基础上, 以碳纤维电极(CFE)为基底, 制备了一种新型的DNA-过氧化聚吡咯(PPyox)生物复合膜传感器, 与单一的DNA或PPyox修饰层相比具有更高的灵敏度和选择性.

关键词: DNA生物传感器, 过氧化聚吡咯, 多巴胺, 5-羟色胺

Abstract: A promising electrochemical microsensor was fabricated by electrochemical immobilization of DNA on a carbon fiber electrode(CFE) through an overoxidized polypyrrole(PPyox) template for simultaneous determination of serotonin(5-HT) and dopamine(DA). Such a nano-thickness DNA-PPyox biocomposite modification layer exhibited a superior selectivity and sensitivity towards these neuronal amines comparing with a simple PPyox or DNA coating. This microsensor gave three separated differential pulse voltammetric(DPV) peaks at 0.38, 0.20 and -0.02 V for 5-HT, DA and 25000-fold excess of ascorbic acid(AA). The utility of this composite biosensor was demonstrated by the determination of 5-HT content in healthy human blood serum and DA in its hydrochloric injection.

Key words: DNA-based biosensor, Overoxidized polypyrrole, Dopamine, Serotonin

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