期刊
ANALYTICAL CHEMISTRY
卷 92, 期 6, 页码 4592-4599出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.0c00018
关键词
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资金
- National Natural Science Foundation of China [21775083, 21775082]
- Research Foundation for Distinguished Scholars of Qingdao Agricultural University [663-1114304]
- Special Foundation for Distinguished Taishan Scholar of Shandong Province
- Major Program of Shandong Province Natural Science Foundation [ZR2018ZC0127]
Despite the recent developments on the construction of point-of-care testing (POCT) devices, it is still a big challenge to build portable POCT tools for simple, sensitive, selective, and quantitative determination of disease-related biomarkers. With this in mind, we developed a simple and user-friendly POCT tool for onsite analysis of DNA adenine methyltransferase (Dam) activity by using DNA tetrahedra-based hydrogel to trap glucose-producing enzymes for target recognition and signal transduction. The enzyme-encapsulated DNA hydrogel and the substrate of enzyme were separately modified on papers and then combined onto a commercial glucose test strip for the sensitive evaluation of Dam activity via using a personal glucose meter (PGM) for quantitative signal readout. Taking advantage of the great amount of enzyme entrapped in DNA hydrogel and the high signal amplification ability of enzyme, this POCT tool is capable of highly sensitive and selective determination of Dam activity with a direct detection limit down to 0.001 U/mL, which is superior to that of most previously reported biosensors. Furthermore, this device can also be applied to screen inhibitor and analyze Dam activity in spiked serum samples, indicating the great potential for clinical practice and diagnostic applications. Additionally, all the reactions for Dam assay are performed on paper, which is simple and deliverable to end-users for medical diagnostics at home or in-field.
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