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Abstract
A novel enzymeless glucose sensor of poly (sulfosalicylic acid) film modified nickel disk-microelectrode based on glucose electrochemical oxidation directly in 0.01 mol dm−3 NaOH has been fabricated. It shows excellent electrocatalytic activities towards glucose oxidation at a low positive potential of 0.49 V (vs. Ag/AgCl). The calibration curve is linear in the glucose concentration range of 6.0 × 10−6 to 1.0 × 10−3 mol dm−3 with a detection limit 9 × 10−7 mol dm−3 (S/N = 3) and sensitivity 3.8 mA μM−1 cm−2. The presented glucose sensor is selective, sensitive, and rapid in response time. It had been used to direct determination of glucose in serum.
Acknowledgments
The authors gratefully acknowledge the financial support received from the National Nature Science Foundation of China (20665003) and the Nature Science Foundation of Guangxi Province (No. 0679002, 0728214).