Abstract
AbstractA hydrogen peroxide sensing electrode was prepared by incorporating cobalt(II) octaethoxyphthalocyanine [CoPc(OEt)8] into a carbon paste (CP) matrix. The CoPc(OEt)8‐modified electrode could oxidize hydrogen peroxide at lower potentials than a CP electrode with unsubstituted cobalt phthalocyanine (CoPc). In addition, the CoPc(OEt)8‐based system showed a high stability; the electrode response to 10mM hydrogen peroxide did not decrease for over 6 h, whereas the hydrogen peroxide response from the CoPc‐modified electrode reduced to half the initial value within 2 h. The CoPc(OEt)8, which is a paraffin oil soluble derivative of CoPc, incorporated into the bulk of the CP diffused towards the electrode surface so as to renew the electrode surface, and this resulted in the high stability of the CoPc(OEt)8‐modified electrode. The electrode was used as the transducer for an L‐lactate‐sensing enzyme sensor; the sensor could be used for more than 4 weeks and 400 assays.
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