Abstract
Screen‐printed electrodes modified with ruthenium dioxide were investigated as amperometric sensors for the determination of hydrogen peroxide using flow injection analysis (FIA). With additions of enzymes (glucose oxidase or xanthine oxidase) immobilized onto the electrode surface via Nafion films, corresponding biosensors for the quantification of glucose or hypoxanthine were developed. Factors influencing their amperometric responses (operational potential, flow rate, pH of the phosphate buffer carrier) were studied in detail. Applications in food analysis were also examined. Supported by the Ministry of Education, Youth, and Sport of the Czech Republic (project MSM0021627502) and from the Grant Agency of the Czech Republic (No. 203/05/2106). Partial support of the CEEPUS program (project PL‐110) is also gratefully acknowledged.
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