Abstract
Two conducting polymers, poly(pyrrole) (PPy) and poly(3,4-ethylenedioxythiophene) (PEDOT) were used as immobilization matrices for cholesterol oxidase (ChOx). The amperometric responses of the enzyme electrodes were measured by monitoring oxidation current of H2O2 at +0.7 V in the absence of a mediator. Kinetic parameters, such as K m and I max, operational and storage stabilities, effects of pH and temperature were determined for both entrapment supports. K m values are found as 7.9 and 1.3 mM for PPy and PEDOT enzyme electrodes, respectively; it can be interpreted that ChOx immobilized in PEDOT shows higher affinity towards the substrate.
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Abbreviations
- Py:
-
pyrrole
- PPy:
-
poly(pyrrole)
- EDOT:
-
3,4-ethylenedioxy thiophene
- PEDOT:
-
poly(3,4-ethylenedioxythiophene)
- ChOx:
-
cholesterol oxidase
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The authors gratefully thank to DPT 2005K 120580, TUBITAK 105T385 and BAP-2007-01-03-03 and TUBA grants.
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Türkarslan, Ö., Kayahan, S.K. & Toppare, L. Poly(pyrrole) versus poly(3,4-ethylenedioxythiophene): amperometric cholesterol biosensor matrices. J Solid State Electrochem 13, 657–663 (2009). https://doi.org/10.1007/s10008-008-0590-7
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DOI: https://doi.org/10.1007/s10008-008-0590-7