Selective Determination of Uric Acid, Tryptphan, and Serotonin at Glassy Carbon Paste Electrode
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概要
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Selective determination of uric acid (UA) was conducted in the presence of ascorbic acid (AA) and acetaminophen (APAP) as interference species at an unmodified glassy carbon paste electrode (GCPE). Using the GCPE prepared in our lab, we succeeded in detecting UA in the presence of AA in acidic and alkaline media. The oxidation peak potential of APAP is very close to that of UA in neutral media, but in alkaline media, a peak separation of ca. 140 mV was obtained between UA and APAP on the differential pulse voltammogram. Moreover, voltammetric determination of tryptophan (Trp) and serotonin (5-HT) was successfully conducted by analyzing the redox peaks of their oxidation products at GCPEs in phosphate buffer solutions in the presence of interferences. The oxidation products of Trp and 5-HT provided redox couples at more negative potentials than for that of the interferences: 5-fold tyrosine (Tyr) did not hinder the determination of Trp, and 200-fold uric acid (UA) and acetaminophen (APAP) did not hinder the determination of 5-HT. In all samples studied in this research, glassy carbon paste electrodes were fairly better than graphite paste electrode.
著者
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Taniguchi Isao
Graduate School Of Science And Technology Kumamoto University
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Nishiyama Katsuhiko
Graduate School Of Natural Science Kumamoto University
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INADA Kazufumi
Graduate School of Science and Technology, Kumamoto University
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