没食子酸丙酯印迹电化学传感器的构建及应用研究

以羧基化的多壁碳纳米管(MWCNT)为基底,通过酰胺化表面接枝聚乙烯亚胺(PEI)得到MWCNT-PEI复合物功能单体,进而以没食子酸丙酯(PG)为模板分子、乙二醇二缩水甘油醚为交联剂,制备了PG表面分子印迹聚合物,最后采用滴涂法在玻碳电极(GCE)表面构建PG分子印迹电化学传感器。通过循环伏安、电化学阻抗和差分脉冲伏安等手段对所构建传感器的导电性以及PG分子的线性响应、特异识别性、检测稳定性和重复性等进行了测试与表征。结果表明,传感器在PG浓度为1×10~(-8)～1×10~(-5)mol/L的范围内具有良好的线性关系,相关系数为0. 9964,检出限达2. 5×10~(-9)mol/L。此外,该传感器在实际样品中的PG回收率为95%～98%。

Construction and Application of Molecular Imprinted Electrochemical Sensor for Propyl Gallate Detection

Molecular imprinted polymers (MIPs) were prepared on polyethylenimine (PEI) grafted multi-wall carbon nanotube (MWCNT-PEI) by using propyl gallate?(PG)?as target molecule, ethylene glycol diglycidyl ether as cross-linker. The molecular imprinted electrochemical sensor (MIES) for PG detection was then constructed by dropping the obtained MIPs onto the surface of glassy carbon electrode (GCE). Characterization and measurement by?FTIR, XRD, CV, EIS and DPV, the conductivity, linear response, specificity,?stability and repeatability of the sensor for PG?detection were investigated in detail. The constructed MIES exhibited excellent linear?responses to PG?in the range of?1×10-8 to 1×10-5 mol·L-1, with a detection limit of 2.5×10-9 mol·L-1.?As a result, the recovery of PG?in real?samples was about 95?%~98?%.