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DNA在碳纳米管表面的固定、表征及损伤的电化学检测 被引量:5

Immobilization, Characterization of DNA on the Surface of Carbon Nanotube and Electrochemical Detection of DNA Damage
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摘要 将DNA通过PDDA[poly(dimethyldiallylammonium chloride)]固定在单壁碳纳米管(CNT)表面,形成DNA-PDDA-CNT纳米复合体,用AFM、UV-Vis、Raman光谱及交流阻抗对其进行了表征.用伏安法研究了1-苯基偶氮-2-萘酚(PN)与固定在CNT表面的DNA的相互作用,结果表明PN与DNA的作用方式为嵌入作用;并且,PN能用作电化学检测DNA化学损伤的探针分子.本文电化学检测DNA损伤的优点在于PN的氧化还原式量电位E0'≈0.1V(vs.SCE,pH5.5),能有效降低其它电活性物质对DNA损伤电化学检测的干扰. DNA-PDDA-CNT nanocomposites were fabricated by immobilizing DNA on the surface of single-walled carbon nanotubes (CNT) via poly(dimethyldiallylammonium chloride) (PDDA). The atomic force microscopy (AFM), ultraviolet-visible (UV-Vis), Raman spectroscopy and impedance spectroscopy (EIS) were used to characterize the growth processes of the nanocomposites. The cyclic voltammetric results indicate that the interaction between 1-phenylazo-2-naphthol (PN) and the immobilized DNA is intercalative binding, and PN can be used as a probe for detection of DNA damage. PN seems to be an attractive probe for DNA damage analysis since its redox peak is at ca. 0.1 V (vs. SCE, pH 5.5), where interference should be minimal.
出处 《化学学报》 SCIE CAS CSCD 北大核心 2008年第4期424-432,共9页 Acta Chimica Sinica
基金 国家自然科学基金(Nos.20373027 20673057 20773067) "新世纪优秀人才支持计划"(No.NET-06-0508) 江苏省自然科学基金(No.BK2005138) 分子医学生物技术江苏省重点实验室基金(No.MMBKF05001) 江苏省高校自然科学基金(No.06KJB150061)资助项目
关键词 碳纳米管 DNA DNA损伤 电化学检测 carbon nanotube DNA DNA damage electrochemical detection
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