中文摘要：

以石墨烯为电极增敏材料,多巴胺印迹聚合物为特异性识别材料,采用滴涂法组装石墨烯修饰电极的分子印迹电化学传感器。考察了pH值、石墨烯浓度、印迹聚合物浓度对传感器的影响,优化的实验条件为：pH 7.0,石墨烯浓度为0.5g/L,印迹聚合物浓度为20g/L。实验表明,该印迹传感器对多巴胺的响应电流远大于非印迹电极,同时该印迹传感器对多巴胺具有较好的选择性,检测范围为2.0×10-7～1.0×10-4mol/L,检出限（S/N=3）为6.8×10-8mol/L。该传感器用于盐酸多巴胺注射液的测定,其回收率为98%～105%。

英文摘要：

An electrochemical sensor based on dropped molecular imprinted polymers（MIPs） suspension for dopamine was fabricated.Influences of pH value,concentrations of graphene and MIPs were also optimized.The optimal conditions were as follows：pH value：7.0,concentration of graphene：0.5 g/L,concentration of MIPs：20 g/L.Under the optimal conditions,the prepared sensor showed good selectivity and high sensitivity for dopamine.The DPV peak current is linear to the DA concentration in the range of 2.0×10-7-1.0×10-4 mol/L,with a detection limit（S/N=3） of 6.8×10-8 mol/L.The prepared sensor was successfully applied in the determination of dopamine hydrochloride with recoveries of 98%-105%.