Glucose sensor based on titanium dioxide electrode modified with potassium hexacyanoferrate(III)

A potassium hexacyanoferrate(III) modified titanium dioxide electrode with immobilized glucose oxidase (GOD) was developed for measuring glucose. With this electrode, glucose concentration (1×10−5 to 1×10−3 M) could be determined accurately in the presence of ascorbic acid or uric acid. Glucose in human serum was determined after diluting the serum 10-fold with phosphate buffer of pH 5.5. The glucose concentrations of 70.5–72.7 mg dl−1 were determined in good agreement with those usually found in human serum.