Author(s): Constantin Apetrei | Irina Mirela Apetrei | Jose Antonio De Saja | Maria Luz Rodriguez-Mendez
Journal: Sensors
ISSN 1424-8220
Volume: 11;
Issue: 2;
Start page: 1328;
Date: 2011;
Original page
Keywords: carbon paste electrode | carbonaceous material | carbon nanotube | cyclic voltammetry | antioxidant
ABSTRACT
This work describes the sensing properties of carbon paste electrodes (CPEs) prepared from three different types of carbonaceous materials: graphite, carbon microspheres and carbon nanotubes. The electrochemical responses towards antioxidants including vanillic acid, catechol, gallic acid, L-ascorbic acid and L-glutathione have been analyzed and compared. It has been demonstrated that the electrodes based on carbon microspheres show the best performances in terms of kinetics and stability, whereas G-CPEs presented the smallest detection limit for all the antioxidants analyzed. An array of electrodes has been constructed using the three types of electrodes. As demonstrated by means of Principal Component Analysis, the system is able to discriminate among antioxidants as a function of their chemical structure and reactivity.
Journal: Sensors
ISSN 1424-8220
Volume: 11;
Issue: 2;
Start page: 1328;
Date: 2011;
Original page
Keywords: carbon paste electrode | carbonaceous material | carbon nanotube | cyclic voltammetry | antioxidant
ABSTRACT
This work describes the sensing properties of carbon paste electrodes (CPEs) prepared from three different types of carbonaceous materials: graphite, carbon microspheres and carbon nanotubes. The electrochemical responses towards antioxidants including vanillic acid, catechol, gallic acid, L-ascorbic acid and L-glutathione have been analyzed and compared. It has been demonstrated that the electrodes based on carbon microspheres show the best performances in terms of kinetics and stability, whereas G-CPEs presented the smallest detection limit for all the antioxidants analyzed. An array of electrodes has been constructed using the three types of electrodes. As demonstrated by means of Principal Component Analysis, the system is able to discriminate among antioxidants as a function of their chemical structure and reactivity.
