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利用铜离子(Cu~(2+))可与DNA分子中的碱基相互作用形成络合物的性质,将Cu~(2+)富集在DNA修饰电极表面,进而采用微分脉冲伏安法(DPV)实现了铜离子的检测.此外,由于乙二胺四乙酸(EDTA)对Cu~(2+)具有更强的络合能力,富集于DNA修饰电极表面的Cu~(2+)很容易被洗脱液中的EDTA络合,从而实现修饰电极的再生和重复利用.实验结果表明,在最佳实验条件下,Cu~(2+)浓度在2.0×10-6~1.0×10-5mol/L和2.0×10-5~1.0×10-4mol/L范围内与其相对还原峰电流强度(I-I0)呈良好的线性关系,且该传感器简单、稳定,可循环使用. 相似文献
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发现碳点对鲁米诺电化学发光体系有明显的抑制作用, 并且由于碳点对单双链DNA的吸附性差异, 与单双链结合的碳点对鲁米诺电化学发光体系的抑制程度不同, 基于此实现了对DNA的快速、简便、灵敏的检测. 考察了碳点粒径、浓度对鲁米诺电化学发光体系的抑制行为的影响. 优化了溶液pH值, 鲁米诺浓度等电化学发光条件. 在优化的最佳实验条件下, 该方法检测DNA的线性范围为1.0×10-10~7.5×10-9 mol/L, 检出限为5.2×10-11 mol/L. 相似文献
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A novel core-shell luminol-based SiO2 nanoparticle While these nanoparticles were used as electrogenerated was synthesized by two step micro-emulsion method. chemiluminescence (ECL) reagent, the electrochemical (EC) reaction as well as the subsequent chemiluminescence (CL) reaction not only could be separated spatially, but also presented high efficiency for analytical purpose. In this case, the core-shell luminol-based SiO2 nanoparticles offered more potential to avoid the contradiction between the EC and the CL reaction conditions. A new ECL method based on the nanoparticle was developed, and isoniazid was selected as a model analyte to illustrate the characteristics of this new ECL method. Under the selected conditions, the proposed ECL response to isoniazid concentration was linear in the range of 1.0 ×10^-10 to 1.0 × 10^-6 g/mL with 2 × 10^-11g/mL detection limit. 相似文献
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簇状纳米二氧化锰修饰玻碳电极电化学发光法测定己烯雌酚 总被引:6,自引:0,他引:6
基于簇状纳米二氧化锰可显著增强玻碳电极的导电性能,且己烯雌酚在该电极上能够增强鲁米诺体系的电化学发光,据此建立了电化学发光测定己烯雌酚的新方法。采用壳聚糖包覆的方法将簇状纳米二氧化锰固定在玻碳电极表面,考察了电极的稳定性以及影响电化学发光的因素。己烯雌酚浓度在3.5×10-11~6.5×10-9mol/L范围内,与电化学发光信号呈良好线性关系;检出限(3σ)为2.0×10-11mol/L。对4.0×10-10mol/L己烯雌酚进行11次平行测定,相对标准偏差(RSD)为1.1%。 相似文献
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