制备了羧基-β-环糊精与磁性石墨烯混合溶液,采用滴涂法对玻碳电极进行修饰,然后对多巴胺进行电化学测定.在pH 6.0的磷酸盐缓冲溶液(PBS)中,扫描速率为0.10 V/s时,修饰后的复合膜电极的氧化还原峰电流变化值与多巴胺的浓度在1.5×10-5～5.0×10-3 mol/L范围内呈良好的线性关系,线性方程为ipa=-0.1158c-3.4257×10-6,r2=0.9915.该电极对多巴胺具有良好的电催化作用和较高的电子传递速率,采用加标回收法测定多巴胺模拟样品,回收率为98.3％～ 103.2％,检出限为5.7 × 10-7 mol/L.%Carboxyl β-cyclodextrins-magnetic graphene composite materials were prepared and used to modify bare glass carbon electrode by drop-coating method, and dopamine(DA) was determined utilizing the modified electrode via cyclic voltammetry. The volt-ampere characteristics of modified electrode had good liner relationship, the change value of peak current curves was proportional to the concentration of DA in phosphate buffer(pH 6.0) in the range of 1.5 × 1O-5-5.O × 10-3 mol/L as scaning rate was 0.10 V/s. The linear regression equation was ipa=-O.l158c-3.425 7×10-6, r2=0.991 5. The modified electrode had better electronic transmission rate and faster electrocatalystic properties, the simulation samples were determined via the recovery method, the recovery was 98.3%-103.2%, and the detection limit was 5.7 X 10-7mol/L.
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