Poly(pyrrole) versus poly(3,4-ethylenedioxythiophene): amperometric cholesterol biosensor matrices

Tuerkarslan O., Kayahan S. K., TOPPARE L. K.

JOURNAL OF SOLID STATE ELECTROCHEMISTRY, vol.13, no.5, pp.657-663, 2009 (SCI-Expanded) identifier identifier


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.