An enzyme-free electrochemical sandwich DNA assay based on the use of hybridization chain reaction and gold nanoparticles: application to the determination of the DNA of Helicobacter pylori.

本文报道了一种用于检测单链DNA寡核苷酸的超灵敏无酶电化学夹心DNA生物传感器，并以幽门螺杆菌基因组来源的43碱基目标DNA为模型靶标。传感器在金电极表面固定捕获DNA，经6-巯基-1-己醇封闭后捕获目标DNA；随后加入共修饰报告DNA和引发DNA的金纳米颗粒，使目标DNA被标记。金纳米颗粒上高密度引发DNA可触发两条发夹DNA的杂...