Fluorescence sensing strategy based on aptamer recognition and mismatched catalytic hairpin assembly for highly sensitive detection of alpha-fetoprotein

检出限 化学 适体 荧光团 荧光 甲胎蛋白 色谱法 肝细胞癌 分子生物学 癌症研究 生物 量子力学 物理
作者
Shengqiang Li,Xu Liu,Shenglin Liu,Mei Guo,Cuiying Liu,Ming Pei
出处
期刊:Analytica Chimica Acta [Elsevier]
卷期号:1141: 21-27 被引量:45
标识
DOI:10.1016/j.aca.2020.10.030
摘要

At present, alpha fetoprotein (AFP) is mainly used as a serum marker of primary Hepatocellular carcinoma. A simple, enzyme-free sensing strategy is introduced for highly sensitive fluorescence detection of AFP. This detection strategy is based on aptamer recognition and mismatched catalytic hairpin assembly (MCHA). At first, Trigger is locked by aptamer before the introduction of AFP in this aptamer-MCHA system. The aptamer preferentially combines with AFP via powerful attraction in the presence of AFP. This results in the release of trigger and initiation of MCHA cycle, thus forming the H1 and H2 double chain complexes (denoted as [email protected]). Finally, [email protected] and double chain structure containing fluorophore and its quenched group- BHQ1 (denoted as [email protected]) initiated displacement reaction, which caused double chain separation and fluorescence recovery. This assay produces a wide detection range, which is from 0.1 ng mL−1 to 10 μg mL−1 and the limit of detection as 0.033 ng mL−1. The whole detection process was performed at 37 °C for 60 min. In addition, this assay had high anti-interference ability and could be used to detect AFP in clinical serum. This novel AFP detection strategy is able to screen of Hepatocellular carcinoma.
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