期刊论文

中文

分析化学

0253-3820

2022

50

9

1355-1363

10.19756/j.issn.0253?3820.221191

National Nature Science Foundation of China [21605022]; Special Fund for Key Program of Science and Technology of Fujian Province,China [2020YZ019007]; Fuzhou Science and Technology Plan Project, China [2019-S-66]

本校为其他机构

利用纳米金(AuNPs)可在对苯二酚作为弱还原剂条件下特异性催化银离子沉积的金标银染信号放大特性,制备了一种高效、灵敏检测冈田酸(OA)的电化学核酸适配体传感器,实现了复杂样品中痕量OA的检测.当溶液中存在OA时,电极表面的OA适配体可与溶液中的OA特异性结合而从电极表面解离下来,标记了AuNPs的信号探针再通过与游离的捕获探针杂交反应将AuNPs修饰至电极表面,然后将电极浸泡到银染试剂中进行银染反应,最后通过方波伏安法(SWV)直接检测纳米银的氧化信号,从而实现对OA的检测.在最佳实验条件下,此传感器的线性范围为10.0 pg/mL～500.0 ng/mL,检出限(3σ/k)为8.8 pg/mL.将此传感器应用于淡菜样品中O...

Based on silver-enhanced gold nanoparticles (AuNPs) label technique that AuNPs could specifically catalyze the deposition of silver ions using hydroquin as a weak reducing agent, an efficient and sensitive electrochemical aptasensor was developed for detection of trace okadaic acid (OA). When the sample solution containing OA, the OA aptamer dissociated from the dsDNA on electrode surface due to the specific binding between OA and OA aptamer, AuNPs labeled signal probe (Sp) could hybridize with the resulted free capture probe (Cp) on the electrode surface. And then, the electrode was immersed ...