1. 广西民族大学化学化工学院
2. 广西林产化学与工程重点实验室
3. 广西高校食品安全与药物分析化学重点实验室
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胡琪, 谭学才, 吴佳雯, 等. 基于石墨烯掺杂金纳米粒子的灭除威分子印迹电化学传感器的制备与性能研究[J]. 分析测试学报, 2015,34(3):328-334.
Preparation of Molecularly Imprinted Electrochemical Sensor for Detection of 3,5-Xylyl Methylcarbamate Based on Gold Nanoparticles dopped Graphene Modified Glassy Carbon Electrode[J]. 2015,34(3):328-334.
以灭除威(XMC)为模板分子,甲基丙烯酸(MAA)为功能单体,合成的马来松香丙烯酸乙二醇酯(EGMRA)为交联剂,在石墨烯掺杂金纳米粒子修饰玻碳电极表面合成分子印迹膜,研制了测定XMC的分子印迹电化学传感器。采用扫描电镜(SEM)对传感膜的形貌进行表征,通过循环伏安法(CV)、电化学阻抗谱法(EIS) 和差示脉冲伏安法(DPV)对传感器的性能进行研究。DPV测试表明,XMC的浓度在1.0×10-7~2.0×10-5 mol?L-1范围内呈良好线性关系,相关系数(r)为0.997 9,检出限(S/N=3)为 1.5×10-8 mol?L-1。选择性识别实验结果表明,XMC印迹敏感膜的印迹因子(β)达到2.94,相对于干扰物的选择因子(α)均大于1,对与XMC结构相似的速灭威的选择因子达到2.39,说明该印迹膜对XMC具有良好的选择性。识别过程动力学研究结果表明,石墨烯掺杂金纳米粒子分子印迹传感器的动力学结合速率常数k为73.05 s。将此传感器应用于蔬菜样品的加标回收检测,加标回收率为95.4%~108.0%。
A new molecular imprinted electrochemical sensor was developed for the detection of 3,5-xylyl methylcarbamate(XMC) by combination of graphene and gold nanoparticles.The molecularly imprinted polymer(MIP) was synthesized on the surface of grapheme and gold nanoparticles modified glassy carbon electrode by using XMC as template molecular,methyl acrylic acid(MAA) as functional monomer,and ethylene glycol maleic rosinate acrylate(EGMRA) as cross-linker.The morphology of the sensing membrane was characterized by scanning electron microscopy(SEM).The performance of the sensor was investigated by cyclic voltammetry(CV),differential pulse voltammetry(DPV) and electrochemical impedance spectroscopy(EIS).A linear relationship between oxidation peak current and XMC concentration was obtained over the range of 1.0×10-7-2.0×10-5 mol?L-1 with a correlation coefficient of 0.997 9 and a detection limit(S/N=3) of 1.5×10-8 mol?L-1.The selectivity experiments showed that the imprinting factor(β) of XMC imprinted film was 294 and the selectivity factors(α) of XMC compared to interference were all larger than 1.Although a minor interference was generated by XMC for its structure similar to metolcarb,the selectivity factor also reached to 2.39.The results indicated that the imprinted polymer films exhibited an excellent selectivity for XMC.The kinetics of recognition suggested that the process of the imprinted polymer films adsorbing XMC is Langmuir model and its kinetic rate constant is 73.05 s.The imprinted sensor was successfully used to determine XMC in vegetable samples with recoveries of 95.4% -108.0% by using the standard addition method.
灭除威石墨烯掺杂金纳米粒子马来松香丙烯酸乙二醇酯分子印迹电化学传感器选择性识别
35-xylyl methylcarbamategraphene doping gold nanoparticlesethylene glycol maleic rosinate acrylatemolecularly imprinted electrochemical sensorselective recognition
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