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Citation: MA Xin-Ying, LIN Xian-Jie. Selective Determination of Norepinephrine in the Presence of High Concentration of Ascorbic Acid at Valine Modified Glassy Carbon Electrode[J]. Chinese Journal of Applied Chemistry, ;2009, 26(3): 287-291. shu

Selective Determination of Norepinephrine in the Presence of High Concentration of Ascorbic Acid at Valine Modified Glassy Carbon Electrode

MA Xin-Ying ,
LIN Xian-Jie ^,

1.
Department of Chemistry and Chemical Engineering, Heze University, Heze 274015

Corresponding author: LIN Xian-Jie,
Received Date: 7 March 2008
Available Online: 30 June 2008
Fund Project: 国家自然科学基金资助项目(20633060) (20633060)菏泽学院博士基金研究项目(XY06BS02) (XY06BS02)

A glassy carbon eletrode(GCE) was modified with electropolymerized films of valine by cyclic voltammetry(CV) in phosphate buffer solution(PBS) of pH=9.0 containning 0.01 mol/L valine and conditioned by cyclic sweeping from 1.0~2.4 V at 40 mV/s for 9 scans.The modified electrode showed an excellent electrocatalytical effect on the oxidation of norepinephrine(NE).The voltammetric behavior and electrochemical analysis method of NE were studied on the modified electrode.The effect of PBS pH value on the response of NE was studied in a pH value range of 2.2~8.0.The results show that the redox peak potential of NE shifts negatively with increasing of pH value and a pair of well-defined redox waves are observed in PBS of pH=4.0.The modified electrode was used to determine NE in an excess of ascorbic acid(AA) by reduction peak current of CV.The reduction peak currents increased linearly in two concentration ranges of NE,one is 4.6×10^-7~1.1×10^-5 mol/L,the other is 1.1×10^-5~1.2×10^-4 mol/L,correlation coefficients of which are 0.995 7 and 0.991 8 respectively,the detection limit(S/N=3) is 8.0×10-8 mol/L.The linear regression equations are i_pc(A)=6.80×10^-7+1.05c and i_pc(A)=1.23×10^-5+0.16c.The valine modified electrode showed good sensitivity,selectivity,stability.It was applied to the NE injection sample analysis.
- chemically modified electrode,
- valine,
- norepinephrine
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