A novel anti-interference and pH-modulation device: application to enzyme-free glucose detection
We report on a novel anti-interference and pH-modulation device (herein after referred to as “device”). It is based on electrodialysis and can continuously increase the pH value of the carrier solution and - at the same time - remove interfering analytical signals obtained for ascorbic acid (AA) and...
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Published in | Mikrochimica acta (1966) Vol. 173; no. 1-2; pp. 19 - 26 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Vienna
Springer Vienna
01.04.2011
Springer |
Subjects | |
Online Access | Get full text |
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Summary: | We report on a novel anti-interference and pH-modulation device (herein after referred to as “device”). It is based on electrodialysis and can continuously increase the pH value of the carrier solution and - at the same time - remove interfering analytical signals obtained for ascorbic acid (AA) and uric acid (UA). The “device” was coupled to the FIA-amperometric detection of glucose. The linear range is from 1 μmol L
−1
to 0.4 mmol L
−1
, with a sensitivity of 213 μA cm
−2
mM
−1
and a detection limit of 1 μmol L
−1
at a signal-to-noise ratio of 3. The method was used to sucessfully determine glucose in serum. This study represents a novel technique for overcoming analytical interference and is expected to find applications in liquid chromatography, for example in on-line pH-modulation if different pH values are needed for separation and detection.
Figure
As shown in the figure, a specific electrolytic current was applied between the two electrodes. Thus H
2
O in the cathode chamber was electrolyzed to produce H
2
and OH
-
. Then the OH
-
moved through the anion exchange membrane and got into the packed column by electromigration, where it mixed with the carrier solution of Na
2
SO
4
. Meanwhile, the SO
4
2-
of the carrier solution moved through the other anion exchange membrane and entered the anode chamber. Therefore, the carrier solution of Na
2
SO
4
was partly converted into NaOH after passing through the “device”. |
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ISSN: | 0026-3672 1436-5073 |
DOI: | 10.1007/s00604-010-0501-3 |