碳纳米管和聚电解质修饰玻碳电极的电化学行为及对芦丁的检测

Electrochemical Behaviors of GC Electrode Modified with Carbon Nanotubes-Polyelectrolytes and its Application for Rutin Detection

研究了芦丁和抗坏血酸在碳纳米管与聚电解质复合材料修饰电极(PDDA/SWCNTs/GC)上的电化学行为.循环伏安测试结果表明,在该修饰电极上芦丁的电子传递反应受吸附控制.在碳纳米管和PDDA的共同作用下,芦丁和抗坏血酸的氧化峰电位分离大于200 mV.利用微分脉冲伏安法测定了不同浓度芦丁的电流响应,线性范围为2.5～110μmol.L-1,检出限0.5μmol.L-1.即使抗坏血酸浓度较高时,氧化峰电流与芦丁的浓度仍然呈良好的线性关系.该修饰电极制作简便,可应用于药物中芦丁含量的直接检测.

The electrochemical behaviors of rutin and ascorbic acid on glassy carbon（GC） electrodes modified with single-wall carbon nanotubes and polyelectrolytes（poly-dimethyl-diallylammonium chloride,PDDA） film were investigated.The cyclic voltammetric results showed that the electron transfer of rutin at PDDA/SWCNTs/GC modified electrode is an adsorption-controlled process.The separation of oxidation peak potentials of rutin and ascorbic acid（AA） was more than 200 mV.The detection of rutin in the presence of high concentration AA was made possible by differential pulse voltammetry（DPV） using the PDDA/SWCNTs/GC modified electrode.The DPV results showed a good linearity in the range of 2.5~110 μmol/L with a correlation coefficient of 0.9914.The detection limit was 0.5 μmol/L.The proposed method had been successfully applied to detect the compound rutin tablets.