Direct Electrochemical Detection of Oligonucleotide Hybridization on Poly(5-hydroxy-1,4-naphthoquinone- <i>co</i>-5-hydroxy-3-thioacetic Acid-1,4-naphthoquinone) Film
作者:M. C. Pham、B. Piro、L. D. Tran、T. Ledoan、L. H. Dao
DOI:10.1021/ac034770f
日期:2003.12.1
We describe the construction of a new DNA-modified electrode based on an electroactive film. 5-Hydroxy-1,4-naphthoquinone is coelectrooxidized with 5-hydroxy-3-thioacetic acid-1,4-naphthoquinone to give a copolymer, presenting both electroactive and chemically reactive groups. The carboxylic function acts as a precursor for the covalent grafting of ODN probes while the quinone group acts as the transduction element of hybridization. Electrochemical detection was performed by differential pulse voltammetry in the electroactivity domain of the quinone group (i.e., at very low potentials, 0 to −0.8 V vs SCE). A very clear modification of the redox activity is observed between unmodified and probe-modified films and especially upon addition of target ODN.
我们描述了基于电活性膜的新型 DNA 修饰电极的构造。 5-羟基-1,4-萘醌与5-羟基-3-硫代乙酸-1,4-萘醌共电氧化得到共聚物,同时具有电活性和化学活性基团。羧基官能团充当ODN探针共价接枝的前体,而醌基团充当杂交的转导元件。通过差分脉冲伏安法在醌基团的电活性域(即,在非常低的电势下,0至-0.8V vs SCE)进行电化学检测。在未修饰的膜和探针修饰的膜之间观察到氧化还原活性的非常明显的修饰,特别是在添加目标 ODN 后。