Electrochemical Biosensor Based on HRP/TiC/Nafion Film for Determination of Hydrogen Peroxide in Serum Samples of Patients with Acute Myocardial Infarction.

Hydrogen peroxide (HO) has been reported to mediate a variety of physiological and pathological processes in living systems. In this work, a biosensor for determination of HO was prepared by using an HRP/TiC/Nafion film-modified glassy carbon electrode (GCE). TiC nanosheets with remarkable conductivity and high specific surface area were chosen as carriers for HRP. Moreover, this biosensor modified with HRP has a specific catalytic effect on HO. The difference in peak current could reflect the quantitative change of HO. The linear range of the biosensor is 5-8000 μM, and the detection limit is 1 μM (/ = 3). This biosensor was used to detect HO in clinical serum samples of normal controls and patients with acute myocardial infarction (AMI) before and after percutaneous coronary intervention (PCI). The results showed that the difference between normal controls and patients is significant ( < 0.05), as well as the difference for patients before and after PCI ( < 0.01), but no significant difference existed between postoperative patients and normal controls. This biosensor has the advantages of simple preparation, high sensitivity, and quick detection, showing potential application in clinical diagnosis.