高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (8): 1390.

• 论文 • 上一篇    下一篇

基于纳米金胶标记DNA探针的电化学DNA传感器研究

蔡宏, 王延琴, 何品刚, 方禹之   

  1. 华东师范大学化学系, 上海 200062
  • 收稿日期:2002-02-05 出版日期:2003-08-24 发布日期:2003-08-24
  • 通讯作者: 方禹之(1931年出生),男,教授,博士生导师,从事生物电化学、光谱电化学和毛细管电泳等方面研究.
  • 基金资助:

    国家自然科学基金(批准号:29875008)资助

Studies on an Electrochemical DNA Biosensor Based on Gold Nanoparticle-labeled DNA Probe

CAI Hong, WANG Yan-Qin, HE Pin-Gang, FANG Yu-Zhi   

  1. Department of Chemistry, East China Normal University, Shanghai 200062, China
  • Received:2002-02-05 Online:2003-08-24 Published:2003-08-24

摘要: 以纳米金胶为标记物,将其标记于人工合成的5-端巯基修饰的寡聚核苷酸片段上,制成了具有电化学活性的金胶标记DNA电化学探针;在一定条件下,使其与固定在玻碳电极表面的靶序列进行杂交反应,利用ssDNA与其互补链杂交的高度序列选择性和极强的分子识别能力,以及纳米金胶的电化学活性,实现对特定序列DNA片段的电化学检测以及对DNA碱基突变的识别.

关键词: 纳米金胶, 电化学DNA传感器, 杂交反应, 突变

Abstract: An electrochemical detection method for the analyzing sequence-specific DNAusing gold nanoparticle labeled oligonucleotide DNAprobes has been developed.Target DNAwere covalently immobilized on a glass carbon electrode and incubated with gold nanoparticle-labeled DNAprobes, containing a complementary sequence.Binding events were monitored by electrochemical signal of gold nanoparticle hybridized to the electrode surface.The signal difference permits to distinguish the match of two perfectly complementary DNAstrands from the near-perfect match where just one base pair was wrong.The sensitivity of this electrochemical DNAbiosensor has been detected and a detection limit of 1.0 nmol/Lof oligonucleotides was achieved.

Key words: Gold nanoparticle, Electrochemical DNA biosensor, Hybridization, Mismatch detection

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