期刊
TALANTA
卷 189, 期 -, 页码 143-149出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2018.05.061
关键词
Aptamer; FP; rHuEPO-alpha; MNP@PDA; Mass amplification; Magnetic separation
资金
- National Natural Foundation of China [21775068, 21475060, 21405077]
- Natural Science Foundation of Jiangsu Province [BK20140591]
In this paper, an amplified fluorescence polarization (FP) aptasensor based on magnetic nanoparticles @polydopamine (MNP@PDA) was innovatively developed for sensitive detection of recombinant human erythropoietin-alpha(rHuEPO-alpha). The amplified FP signal was due to the large mass of protein and MNP@PDA. And this assay can be utilized for target separation or recycling based on the magnetic property of MNP@PDA through magnetic separation. Briefly, rHuEPO-alpha and MNP@PDA were added successively to react with the labeled aptamer (FAM-P1), which both contributed to the increase of FP signal via the formation of FAM-P1-rHuEPO-alpha and particularly FAM-P1-MNP@PDA complex. The strong interaction between MNP@PDA and FAM-P1 ensured the high efficiency of mass amplification and magnetic separation. As a result, the detection limit for rHuEPO-alpha was 0.12 pM, 4 orders of magnitude lower than original assay. Besides, three kinds of rHuEPO-alpha injections, NuPIAO, Epogen and ESPO were used to evaluate the selectivity of this assay in complex matrix with reasonable standard deviation. In a word, this work provides a simple, rapid, non-modified, highly sensitive and selective sensing platform for the detection of rHuEPO-alpha.
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