碳纳米管负载钴/铁混合氧化物修饰电极碱性条件下测定葡萄糖

Determination of Glucose in Alkaline Solution with a Co_xFe_yO_z/MWCNTs/CCE Modified Electrode

以碳纳米管为模板,采用电化学方法制备了碳纳米管负载的钴/铁混合氧化物修饰电极,并研究了该修饰电极在碱性介质中对葡萄糖的电催化活性.结果表明,该修饰电极对葡萄糖具有良好的电催化氧化活性.在优化条件下,安培法检测葡萄糖的线性范围为2.0 x 10-7～4.2x10-5 mol·L-1和4.2x10-5～4.9x10-4 mol·L-1,检出限（3sb,n=7）为5.0 x10-8 mol·L-1,灵敏度分别为242.7UA·（mmol·L-1）-1和114.8 μA·（mmol·L-1）-1。

A MWCNTs loading cobalt-iron mixed oxide modified electrode was fabricated by using cy-clic vohammetry. The electrocatalytic activity of the modified electrode for the oxidation of glucosewas investigated by cyclic vohammetry and amperometric method. The results showed that the modi-fied electrode exhibited a high electrocatalytic activity for the oxidation of glucose. Based on this, anamperometric method for the determination of glucose was established. Under the optimum condi-tions, the oxidation peak current had linear relationships with concentrations of glucose over the ran-ges of 2. 0 x 10-7 -4. 2 x 10-5 mol· L-1 and 4. 2 x 10-5 -4. 9 x 10-4 mol · L-1 , with sensitivitiesof 242. 7 μA· （ mmol · L-1 ） -1 and 114. 8 μA· （mmol · L-1 ） -1 , respectively. The detection lim-it（3ss） was 5.0 x 10-8 tool · L-1 The proposed method was successfully applied in the detection ofglucose in serum.