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黄嘌呤分子印迹电化学微传感器的响应特性

DOI: 10.11830/ISSN.1000-5013.2013.06.0655

Keywords: 分子印迹聚合物, 电化学传感器, 黄嘌呤, 吡咯, 响应特性, 吸附特性

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Abstract:

在碳纤维电极上,通过循环伏安法直接制备以吡咯为功能单体,黄嘌呤为模板分子的分子印迹聚合物膜,考察基于此印迹膜的电化学微传感器对黄嘌呤的响应特性.实验结果发现:该印迹膜有利于黄嘌呤在微电极上的氧化,其电极反应是单电子过程,具有良好的特异识别性;黄嘌呤浓度在4.0~60 μmol?L-1和0.08~2.0 mmol?L-1与其氧化峰峰电流有很好的线性关系,检测限达0.25 μmol?L-1.动力学和热力学实验数据表明:印迹膜微传感器对黄嘌呤响应速度较快,模拟Langmuir模型拟合计算的动力学速率常数是0.24 min,小于玻碳印迹膜传感器的0.71 min,印迹因子为14.1,稍大于玻碳印迹膜传感器的9.0,远远高于对其他常见共存物和结构相似物的识别.

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