A Universal Paper-Based Electrochemical Sensor for Zero-Background Assay of Diverse Biomarkers

作者：Xiaojuan Liu, Xiuyuan Li, Xin Gao, Lei Ge, Xinzhi Sun, Feng Li · 发表于：ACS Applied Materials & Interfaces · 年份：2019 · DOI：10.1021/acsami.9b03860 · 被引用次数：124 · 研究领域：Advanced biosensing and bioanalysis techniques、Biosensors and Analytical Detection、SARS-CoV-2 detection and testing

This paper describes a universal paper-based electrochemical sensing platform that uses a paper modified with signal molecule-labeled DNA and a screen-printed electrode along with target recognition solutions to achieve the detection of multiple types of biomarkers. These assays rely on the target-induced synthesis of Mg 2+ -dependent DNAzyme for catalyzing the cleavage of substrate DNA from paper, which have been demonstrated by using microRNA recognition probe for miR-21, a phosphorylated hairpin probe for alkaline phosphatase, and a DNA aptamer for carcinoembryonic antigen assays, respectively. Taking advantages of the high specific target-triggered polymerization/nicking and DNAzyme-catalyzed signal amplification, the present assays enable highly sensitive and selective detection of these targets with zero-background. These assays can also be applied to detect target in spiked serum samples, demonstrating the potential for point-of-care detection of clinical samples.