期刊
MICROCHIMICA ACTA
卷 187, 期 2, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-019-4093-2
关键词
Multiple G-triplex; ABTS; H2O2; DNAzyme; Isothermal amplification
资金
- National Natural Science Foundation of China [21775099, 21974082]
The authors have incidentally found that the three tandem repeats of a 13-mer G-rich oligomer (with sequence 5 '-TGG GAA GGG AGG G-3 '; referred to as G3) can directly fold into a stable G3 trimer. The G3 trimer/hemin DNAzyme exhibits an about 3-fold higher peroxidase-mimicking activity compared to the conventional G3/hemin DNAzyme. Combining this finding with rolling circle amplification (RCA), a colorimetric assay was developed for sensitive and specific determination of microRNA. In this method, each cycle of RCA generates three catalytic units. This leads to a significant signal amplification of the RCA. Using let-7a as a model analyte, the colorimetric method (best performed at 420 nm) exhibits high sensitivity toward microRNA-let-7a with a 37 fM detection limit and an analytical range that covers 3 orders of magnitude. The method was applied to the determination of let-7a in some cell lysates.
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