A new modified conducting carbon composite electrode as sensor for ascorbate and biosensor for glucose

作者：Barsan Madalina M; Brett Christopher M A^*

来源：Bioelectrochemistry, 2009, 76(1-2): 135-140.

DOI：10.1016/j.bioelechem.2009.03.004

• Cellulose acetate
• Graphite composite
• Electrochemical sensor
• Enzyme biosensor

A new carbon-based conducting composite has been developed as electrochemical sensor and biosensor for the amperometric detection of ascorbate and glucose. Electrocatalytic oxidation of ascorbate has been done successfully at unmodified cellulose acetate-graphite composite electrodes, the sensor being highly sensitive. selective and with a low detection limit at 0.0 V vs. SCE and was successfully applied for ascorbate determination in commercial fruit juice samples. An interference free glucose biosensor has also been developed, based on the immobilisation of glucose oxidase by cross-linking with glutaraldehyde on poly (neutral red) modified composite electrodes. The biosensor exhibits a higher sensitivity of 31.5 /- 1.7 mu A cm(-2) mM(-1) than other carbon-composite-based glucose biosensors, a detection limit of 20.3 mu M and a very short response time.

• 出版日期2009-9