Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (10): 1883-1889.DOI: 10.1016/S1872-2067(12)60661-5

• Articles • Previous Articles     Next Articles

Multiwall carbon nanotube paste electrode with 3,4-dihydroxy-cinnamic acid as mediator for the determination of glutathione in pharmaceutical and urine samples

Mohsen Keyvanfarda, Hassan Karimi-Malehb, Khadijeh Alizada   

  1. a Department of Chemistry, Majlesi Branch, Islamic Azad University, Isfahan, Iran;
    b Department of Chemistry, Graduate University of Advanced Technology, Kerman, Iran
  • Received:2013-05-10 Revised:2013-07-12 Online:2013-09-29 Published:2013-09-29
  • Contact: Mohsen Keyvanfard
  • Supported by:

    This work was supported by Majlesi Branch, Islamic Azad University, Isfahan, Iran

Abstract:

A sensitive and selective electrochemical sensor for the determination of glutathione (GSH) was developed using a modified multiwall carbon nanotube paste electrode with 3,4-dihydroxy-cinnamic acid as a mediator. This modified electrode showed very high electrocatalytic activity for the anodic oxidation of GSH. Under the optimized conditions, the electrocatalytic peak current showed a linear relationship with GSH concentration in the range of 0.5-400.0 μmol/L with a detection limit of 0.1 μmol/L GSH. The relative standard deviations for seven successive assays of 5.0 and 25.0 μmol/L GSH were 2.2% and 2.7%, respectively. The modified electrode was used for the determination of GSH compounds in real urine samples.

Key words: Glutathione, 3,4-Dihydroxy-cinnamic acid, Carbon paste electrode, Multiwall carbon nanotube, Sensor