A Novel Electrochemical Sensor for Probing Doxepin Created on a Glassy Carbon Electrode Modified with Poly(4-Amino- benzoic Acid)/Multi-Walled Carbon Nanotubes Composite Film

Sensors

Xiao-Li Xu²  Fei Huang²  Guo-Liang Zhou²  Song Zhang¹ 

[1] Department of Chemistry & Center of Analysis and Measurement, Fudan University, Handan Road 220#, Shanghai 200433, China;

关键词: poly(4-aminobenzoic acid);    multi-walled carbon nanotubes;    nanocomposite;    doxepin;    detection;   

DOI  :  10.3390/s100908398

来源: mdpi

【 摘 要 】

A novel electrochemical sensor for sensitive detection of doxepin was prepared, which was based on a glassy carbon electrode modified with poly(4-aminobenzoic acid)/multi-walled carbon nanotubes composite film [poly(4-ABA)/MWNTs/GCE]. The sensor was characterized by scanning electron microscopy and electrochemical methods. It was observed that poly(4-ABA)/MWNTs/GCE showed excellent preconcentration function and electrocatalytic activities towards doxepin. Under the selected conditions, the anodic peak current was linear to the logarithm of doxepin concentration in the range from 1.0 × 10⁻⁹ to 1.0 × 10⁻⁶ M, and the detection limit obtained was 1.0 × 10⁻¹⁰ M. The poly(4-ABA)/MWNTs/GCE was successfully applied in the measurement of doxepin in commercial pharmaceutical formulations, and the analytical accuracy was confirmed by comparison with a conventional ultraviolet spectrophotometry assay.

【 授权许可】

CC BY   
© 2010 by the authors; licensee MDPI, Basel, Switzerland.