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Citation: CHEN Gao-Li, MA Wei, SUN Deng-Ming. Preparation of Silver Doped Poly(L-Aspartic Acid) Modified Electrode and Determination of Epinephrine[J]. Chinese Journal of Applied Chemistry, ;2010, 27(3): 353-357. doi: 10.3724/SP.J.1095.2010.90208 shu

Preparation of Silver Doped Poly(L-Aspartic Acid) Modified Electrode and Determination of Epinephrine

School of Chemistry and Materials Science, Huaibei Coal Normal College, Huaibei 235000

Received Date: 30 March 2009
Revised Date: 2 June 2009

A silver doped poly(L-aspartic acid) modified electrode(Ag-PLA/GCE) was prepared by electrochemical immobilization of silver and L-aspartic acid on a glassy carbon electrode surface.The polymerization conditions and the electrochemical behavior of epinephrine were studied.A novel cyclic voltammetric method was proposed for the determination of epinephrine.In a pH=3.5 phosphate buffer solution,a pair of redox peaks were observed at peak potential E_pa=0.447 V and E_pc=0.387 V(vs.Ag/AgCl) at a scan rate of 50 mV/s.By cyclic voltammetry,the oxidation peak current of epinephrine was proportional to the concentration in a range of 8.00×10^-8~1.00×10^-5 mol/L and that of 1.00×10^-5~1.00×10^-4 mol/L.The detection limit was 8.0×10^-9 mol/L.
- epinephrine,
- L-aspartic acid,
- silver doped,
- modified electrode,
- cyclic voltammetry
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