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oai:uvadoc.uva.es:10324/307752025-02-18T13:38:31Zcom_10324_1186com_10324_931com_10324_894col_10324_1404

Rodríguez Méndez, María Luz Apetrei, Constantin Saja Saez, José Antonio De Apetrei, Irina Mirela 2018-07-17T09:46:16Z 2011 Sensors, 2011, vol. 11, n. 2. p. 1328-1344 1424-8220 1424-8220 http://uvadoc.uva.es/handle/10324/30775 10.3390/s110201328 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. eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ © 2011 MDPI Attribution-NonCommercial-NoDerivatives 4.0 International Carbon paste electrodes made from different carbonaceous materials: application in the study of antioxidants info:eu-repo/semantics/article