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Citation: LI Jin-Huan, AI Shi-Yun, SHI Wei-Jie, DU Hong-Xia, MA Yong-Fei. Electrocatalytic Activity of Cobalt(Ⅱ) Polyamidomine Dendrimer Self-assembled Electrode for Guanine[J]. Chinese Journal of Applied Chemistry, ;2008, 25(8): 886-889. shu

Electrocatalytic Activity of Cobalt(Ⅱ) Polyamidomine Dendrimer Self-assembled Electrode for Guanine

1.
College of Chemistry and Materials Science, Shandong Agricultural University, Tai'an 271018

Corresponding author: AI Shi-Yun,
Received Date: 25 July 2007
Available Online: 15 October 2007
Fund Project: 国家自然科学基金(20775044) (20775044)山东省自然科学基金(Y2006B20)资助项目 (Y2006B20)

Cobalt(Ⅱ) polyamidomine dendrimer was synthesized by glyoxal with cobalt chloride and polyamidomine dendrimer 5.0G. A gold electrode was modified with self-assembly of 3-mercaptopropionic acid, which was then reacted with cobalt(Ⅱ) polyamidomine dendrimer modified by the covalent interactions between the carboxyl groups on the modified electrode surface and amino terminals of the dendrimer to yield an electrode modified by the dendrimer. The sensor was used to study the electrocatalytic oxidation of guanine. The effects of pH value, scanning rate and guanine concentration were discussed. The assembled electrode had an obvious electrocatalytic activity on guanine and decreased the oxidation potential of the guanine. In an acetate buffer solution(pH=5.8), the oxidation peak current of guanine and its concentration had a linear relationship in a range of 1.32×10^-6 mol/L to 46.3×10^-6 mol/L at the modified electrode. The regression equation was I_p(μA)=0.294 3c+0.802 9, R₂=0.995 9, and the detection limit was 0.66×10^-6 mol/L. The modified electrode is suitable for the detection of guanine.
- cobalt(Ⅱ) polyamidomine dendrimer,
- self-assembled electrode,
- guanine,
- electrocatalytic activity
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