中文摘要：

将水溶性离子液体（[BMIM]N（CN）2）、多壁碳纳米管（MWCNTs）和壳聚糖（CS）三者结合，修饰在玻碳电极上制备MWCNTs—IL—CS修饰玻碳电极，并研究了多巴胺（DA）、抗坏血酸（AA）、尿酸（UA）在该修饰电极上的电化学行为。扫描电子显微镜图显示，MWCNTs在IL—CS中能良好分散，并形成均一多孔的结构。MWCNTs—IL—CS／GCE对DA、AA、UA均有良好的电催化作用，可有效降低其过电位，提高检测灵敏度。AA—DA、DA—UA的氧化峰电位差分别为208mV和114mV。该修饰电极实现了DA、AA和UA的同时测定，DA、AA和UA的线性范围分别为5．00～425μmol／L、0．020—2．25mmol／L和0．05—10．0mmol／L，检出限（S／N=3）分别为1．01、10．7、42．9μmol／L。该方法有望用于实际样品中DA、AA和UA的同时快速测定。

英文摘要：

An electrochemical sensing platform was developed based on the composite of ionic liquid （ 1-butyl-3-methylimidazolium dicyanamide, [ BMIM ] N （ CN ） 2, IL ）, multi-walled carbon nanotubes（MWCNTs） and polymeric matrix （chitosan, CS）. Scanning electron microscope images showed that MWCNTs had a good dispersibility in the MWCNTs - IL - CS composite and formed a relative smooth film withunique structure. Electrochemical studies indicated that the MWCNTs -IL- CS composite provided a synergistic improvement on the electrochemical oxidation of dopamine（DA） , uric acid（UA） and ascorbic acid （AA） by the decrease of their anodie over-potentials and the enhancement of their amperometric responses. The peak separations between UA and DA, DA and AA were 114 mV and 208 mY, respectively. Additionally, the MWCNTs - IL - CS composite modified i glassy carbon electrode（ MWCNTs- IL- CS/GCE） showed＇ a good analytical performance in the simultaneous determination of DA, AA and UA. The calibration curves of 5.00 - 425 μmol/L, 0. 020 - 2.25 mmol/L and 0. 050 - 10.0 mmol/L, and the detection limits （S/N = 3 ） of 1.01, 10. 7 and 42. 9 μmol/L were obtained for DA, AA and UA, respectively. With good selectivity and sensitivi- ty, the present method is promising in the simultaneous determination of DA, AA anUA in real samples.