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Citation: SUN Wei, YANG Mao-Xia, ZHONG Jiang-Hua, JIAO Kui. Electrochemical Behaviors of Brilliant Cresyl Blue on DNA Modified ld Electrode[J]. Acta Physico-Chimica Sinica, ;2007, 23(04): 499-502. doi: 10.3866/PKU.WHXB20070409 shu

Electrochemical Behaviors of Brilliant Cresyl Blue on DNA Modified ld Electrode

1.
College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong Province, P. R. China

Received Date: 7 September 2006
Available Online: 9 March 2007

DNA modified electrode was prepared by covalent immobilization of ssDNA or dsDNA on a mercaptoethanol monolayer self-assembled ld electrode with the help of N-(3-dimethylaminopropyl)-N'-ethylcarbodiimidehydrochloride (EDC) and N-hydroxysuccinimide (NHS). The electrochemical behaviors of brilliant cresyl blue (BCB) on ssDNA or dsDNA electrodes were studied. BCB had different binding models with ssDNA or dsDNA and the adsorptive constants were 1.67×10^4 L·mol-1 for ssDNA/Au electrode and 3.22×10^4 L·mol-1 for dsDNA/Au electrode. BCB bound to ssDNA via electrostatic interaction while bound to dsDNA through both the electrostatic and intercalative models. The results showed that dsDNA had a stronger appetency for BCB, which indicated that BCB was a suitable electroactive indicator.
- Mercaptoethanol; DNA; Self-assembled monolayer; ld electrode; Electrochemistry; Brilliant cresyl blue
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