Carbon paste electrodes made from different carbonaceous materials: application in the study of antioxidants.
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.
Department of Chemistry, Faculty of Sciences, Dunărea de Jos University of Galaţi, 800008 Galaţi, Romania. apetreic@ugal.ro
Constantin
C
Apetrei
Irina Mirela
IM
Apetrei
Jose Antonio
JA
De Saja
Maria Luz
ML
Rodriguez-Mendez
D000975:Antioxidants / Q000032:analysis*; D001205:Ascorbic Acid / Q000032:analysis / Q000737:chemistry; D002138:Calibration; D002244:Carbon / Q000737:chemistry*; D002396:Catechols / Q000032:analysis / Q000737:chemistry; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D005707:Gallic Acid / Q000032:analysis / Q000737:chemistry; D005978:Glutathione / Q000032:analysis / Q000737:chemistry; D006108:Graphite / Q000737:chemistry; D007700:Kinetics; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D037742:Nanotubes, Carbon / Q000737:chemistry; D015203:Reproducibility of Results; D012996:Solutions; D014641:Vanillic Acid / Q000032:analysis / Q000737:chemistry
D000975:Antioxidants; D002396:Catechols; D037742:Nanotubes, Carbon; D012996:Solutions; D005707:Gallic Acid; D002244:Carbon; D006108:Graphite; D005978:Glutathione; D014641:Vanillic Acid; C034221:catechol; D001205:Ascorbic Acid