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首页> 外文期刊>Electrochimica Acta >Electrochemical DNA-biosensors based on long-range electron transfer: optimization of the amperometric detection in the femtomolar range using two-electrode setup and ultramicroelectrode
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Electrochemical DNA-biosensors based on long-range electron transfer: optimization of the amperometric detection in the femtomolar range using two-electrode setup and ultramicroelectrode

机译:基于远距离电子传输的电化学DNA生物传感器:使用两电极设置和超微电极优化飞摩尔范围内的安培检测

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摘要

We report on the design of electrochemical DNA-biosensors made from 15, 25 and 50 mm diameter gold ultramicroelectrodes (UMEs) in a two-electrode setup. The biosensors were prepared by chemical adsorption of 22-base thiol-labeled DNA-probes in a self-assembled monolayer configuration onto the surface of the gold UME. Hybridization events were transduced by Fe-III/Fe-II redox process electromediated by DNA-redox intercalated mediators. The optimization of the DNA-biosensors was achieved by using different FeIII/FeII ligands (cyanide, cefadroxil, deferoxamine) and intercalators (methylene blue, proflavine). Optimized biosensors allowed direct and selective amperometric detection in the femtomolar range and of single mismatch within a 35 minutes protocol. (C) 2016 Elsevier Ltd. All rights reserved.
机译:我们报告了由直径为15、25和50毫米的金超微电极(UME)在两电极设置中制成的电化学DNA生物传感器的设计。通过以自组装单层结构将22基硫醇标记的DNA探针化学吸附到金UME的表面上来制备生物传感器。杂交事件通过DNA氧化还原插层介体电介导的Fe-III / Fe-II氧化还原过程进行转导。 DNA生物传感器的优化是通过使用不同的FeIII / FeII配体(氰化物,头孢羟氨苄,去铁胺)和嵌入剂(亚甲基蓝,黄酮)来实现的。经过优化的生物传感器可以在飞摩尔范围内进行直接和选择性的安培检测,并且可以在35分钟内完成一次不匹配的检测。 (C)2016 Elsevier Ltd.保留所有权利。

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