期刊
SCIENTIFIC REPORTS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep30577
关键词
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资金
- National Natural Science Foundation of China [21405072, 21505065, 21275086, 21535002]
- Innovation Team Development Plan of the Ministry of Education Rolling Support [IRT_15R31]
- Project of Shandong Province Higher Educational Science and Technology Program [J14LC14, J14LC15]
- Shandong Provincial Natural Science Foundation [ZR2014BL023, ZR2014BL026]
- Special Funds for the Construction of Taishan Scholars [tspd20150209]
- State Key Laboratory of AnalyticaI Chemistry for Life Science [SKLACLS1407]
A novel ternary composite of hemin-graphene-Au nanorods (H-RGO-Au NRs) with high electrocatalytic activity was synthesized by a simple method. And this ternary composite was firstly used in construction of electrochemiluminescence (ECL) immunosensor due to its double-quenching effect of quantum dots (QDs). Based on the high electrocatalytic activity of ternary complexes for the reduction of H2O2 which acted as the coreactant of QDs-based ECL, as a result, the ECL intensity of QDs decreased. Besides, due to the ECL resonance energy transfer (ECL-RET) strategy between the large amount of Au nanorods (Au NRs) on the ternary composite surface and the CdS:Eu QDs, the ECL intensity of QDs was further quenched. Based on the double-quenching effect, a novel ultrasensitive ECL immunoassay method for detection of carcinoembryonic antigen (CEA) which is used as a model biomarker analyte was proposed. The designed immunoassay method showed a linear range from 0.01 pg mL(-1) to 1.0 ng mL(-1) with a detection limit of 0.01 pg mL(-1). The method showing low detection limit, good stability and acceptable fabrication reproducibility, provided a new approach for ECL immunoassay sensing and significant prospect for practical application.
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