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Carbon Paste Electrodes Made from Different Carbonaceous Materials: Application in the Study of Antioxidants

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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.

Tango Jona
Tangokurs Rapperswil-Jona

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