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Citation: BAI Li, GAO Zuo-Ning. Electrocatalytic Oxidation of N-Acetyl-L-Cysteine at 10-Methylphenothiazine Modified Carbon Paste Electrode and Its Practical Analytical Application[J]. Chinese Journal of Applied Chemistry, ;2008, 25(6): 702-705. shu

Electrocatalytic Oxidation of N-Acetyl-L-Cysteine at 10-Methylphenothiazine Modified Carbon Paste Electrode and Its Practical Analytical Application

BAI Li ,
GAO Zuo-Ning ^,

1.
Key Lab of Energy Sources and Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021

Corresponding author: GAO Zuo-Ning,
Received Date: 12 July 2007
Available Online: 11 September 2007
Fund Project: 宁夏高等学校科学研究基金资助项目(200623) (200623)

The electrocatalytic oxidation of N-Acetyl-L-Cysteine (NAC) at a 10-methylphenothiazine (MPT) modified carbon paste electrode (MPT/CPE) was investigated by cyclic voltammetry (CV).Although NAC itself showed a very poor electrochemical response at a carbon paste electrode (CPE),the response could be greatly enhanced at MPT/CPE,which enables a sensitive electrochemical determination of substrate NAC.The reaction rate constant for the catalytic oxidation was evaluated to be (1.59±0.03)×10³(mol·L^-1)^-1·s^-1 by chronoamperometry (CA).The catalytic oxidation peak current of NAC vs its concentration had a good linear relationship in concentration range of 1.0×10^-6~1.3×10^-3 mol/L with a correlation coefficient of 0.999 3,and a detection limit of 8.0×10^-7 mol/L by linear sweep voltammetry (LSV).This method can be applied to the determination of real samples.
- N-Acetyl-L-Cysteine,
- methylphenothiazine,
- modified carbon paste electrode,
- electrocatalytic oxidation,
- Linear Sweep Voltammetry
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