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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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基于“G-4联体”适配子探针的电化学发光传感器检测Pb2+
DOI: 10.11895/j.issn.0253-3820.140197, PP. 942-947
Keywords: 适配子,铅（Ⅱ）离子传感器,电化学发光,量子点,信号增强型,G-4联体
Abstract:
在金电极表面，通过Au-S键接上具有“茎-环”结构的发夹适配子探针（Hairpinaptamerprobe，HAP）；当加入Pb2+时，促使发夹结构适配子的“茎-环”结构打开，形成G-4联体，暴露出的3’-NH2与CdS量子点（QDs）结合，导致电化学发光，据此可构建测定Pb2+的量子点电化学发光“Turnon”型传感器。对电化学发光传感器进行了表征。在2.0×10-10~5.0×10-8mol/L范围内，Pb2+浓度与其响应的ECL信号呈线性关系，检出限为3.74×10-11mol/L。传感器有良好的选择性、稳定性及重现性。
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