On-line glucose monitoring by using microdialysis sampling and amperometric detection based on 'wired' glucose oxidase in carbon paste
Mikrochimica Acta, ISSN: 0026-3672, Vol: 121, Issue: 1-4, Page: 31-40
1995
- 26Citations
- 12Captures
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Article Description
In-vitro on-line glucose monitoring is described, based on microdialysis sampling and amperometric detection operated in a flow-injection system. Samples were injected into a two-electrode microcell containing an Ag/AgCl quasi-reference electrode and a glucose enzyme electrode as the working electrode, operated at + 0.15 V vs. Ag/AgCl. The enzyme electrode is constructed by mixing the 'wired' glucose oxidase into carbon paste. {Poly[1-vinylimidazole osmium(4,4′-dimethylbipyridine)Cl)]} was used to 'wire' the enzyme. The non-coated electrodes, cross-linked with poly(ethylene glycol) diglycidyl ether, responded linearly to glucose concentrations up to 60 mM, and were characterized by a sensitivity of 0.23 μA mM cm, when operated in flow injection mode and of 5.4 μAm M cm in steady-state conditions. This sensitivity of the resulting enzyme electrode was 50% lower than that of similarly prepared but non-cross-linked electrodes. However, the cross-linked electrodes showed superior operational and storage stabilities, which were further improved by coating the electrodes with a negatively charged Eastman AQ film. An in-house designed microdialysis probe, equipped with a polysulphone cylindrical dialysis membrane, yielded a relative recovery of 50-60% at a perfusion rate of 2.5 μl/min in a well stirred glucose solution. The on-line set up effectively rejected common interferences such as ascorbic acid and 4-acetaminophen when present at their physiological concentrations. © 1995 Springer-Verlag.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0002485688&origin=inward; http://dx.doi.org/10.1007/bf01248238; http://link.springer.com/10.1007/BF01248238; http://link.springer.com/content/pdf/10.1007/BF01248238; http://link.springer.com/content/pdf/10.1007/BF01248238.pdf; http://link.springer.com/article/10.1007/BF01248238/fulltext.html; https://dx.doi.org/10.1007/bf01248238; https://link.springer.com/article/10.1007/BF01248238; http://www.springerlink.com/index/10.1007/BF01248238; http://www.springerlink.com/index/pdf/10.1007/BF01248238
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