分子印迹电化学传感器检测水杨酸

Determination of Salicylic Acid Based on an Molecularly Imprinted Electrochemical Sensor

以水杨酸(SA)为模板分子,邻苯二胺(o-PPD)及吡咯(Py)为复合功能单体,在石墨烯修饰的玻碳电极表面制备分子印迹电化学传感器(MIP/GO/GCE),用扫描电镜(SEM)观察印迹膜的表面形貌,方波伏安法(SWV)和循环伏安法(CV)对分子印迹传感器的性能进行表征。通过优化实验条件,显示SA浓度在1.0×10-8~1.0×10-2 mol/L范围内,分子印迹传感器峰电流与SA浓度负对数具有良好的线性关系,检出限为8.6×10-9 mol/L。该传感器对SA具有良好的选择性,样品回收率为101%~106%,相对标准偏差(RSD)为3.8%。SA分子印迹传感器的制备简单、抗干扰性好、灵敏度高、成本低廉,具有较好实用价值。

A molecularly imprinted electrochemical sensor for the detection of salicylic acid(SA) was prepared based on graphene modified glassy carbon electrode,with SA as the template molecule and o-phenylenediamine(o-PPD) and pyrrole(Py) as the functional monomers.The surface morphology of imprinted membrane was observed by scanning electron microscopy(SEM),and the performance of molecular imprinted sensor was investigated based on square wave voltammetry(SWV) and cyclic voltammetry(CV).Results showed that,under the optimal conditions,there was an excellent linear relationship for the electrochemical sensor between peak current and negative logarithm of SA concentration in the range of 1.0×10-8-1.0×10-2 mol/L,with a detection limit of 8.6×10-9 mol/L.The sensor exhibited a good selectivity toward SA,and the recoveries ranged from 101% to 106% with a relative standard deviation(RSD) of 3.8%.With the advantages of simple preparation,good anti-interference ability,high sensitivity and low cost,the molecularly imprinted sensor showed a potentiality in practice application.