"Detection Of Ascorbic Acid In An Ethanol–Water Mixed Solution On A Conductive Diamond Electrode"
Bull. Chem. Soc. Jpn.
2003 Volume 76, Issue 5 Pages 927-933
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Masaharu Komatsu and Akira Fujishima
Abstract:
Conductive boron-doped diamond thin-film electrodes have been shown to be highly suitable as electrochemical detectors in flow injection analysis (FIA) due to the lack of electrode deactivation due to fouling and the ability to withstand highly positive electrochemical potentials. In the present work, a diamond electrode was applied to the detection of ascorbic acid (AA) in an alcohol-water mixed solution. During FIA of AA in an ethanol (EtOH)-water solution including 0.1 M NaClO4, the interference from EtOH oxidation that would have been observed with a Pt electrode was avoided, and the amperometric response for AA was observed with the use of a conductive diamond as the electrode material. Moreover, The detection limit for AA that could be observed was lower than that for a glassy carbon electrode, because diamond exhibits a lower background current, smaller background noise, and smaller injection noise. These findings suggest that the diamond electrode may be applied in the detection of other redox-active impurities and added substances in alcohol or alcohol-water solutions, such as chlorophyll, nicotinamide, caffeine, riboflavin, and dl-α-tocopherol.
Ascorbic acid
Interferences
