期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 18, 期 23, 页码 7263-7268出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201104019
关键词
aptamers; cancer; electrochemistry; magnetic beads; nanoparticles
资金
- National Nature Science Foundation of China [20975059]
- National Basic Research Program of China [2012CB722606]
- Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT)
- Excellent Young Scientists Foundation of Shandong Province [JQ 201005]
- National Nature Science Foundation of Shandong Province [ZR2009BZ005]
- University Doctoral Program Foundation for Youth Teachers
- Ministry of Education of China [20093719120003]
- Fund Project for Shandong Key Technologies RD Program [2010GGX10417]
Herein we report a polymerase chain reaction (PCR)-free electrochemiluminescence (ECL) approach that uses ECL nanoprobes for the determination of cancer cells with high sensitivity. The ECL nanoprobe consists of gold nanoparticles (AuNPs), linker DNA, and tris(2,2'-bipyridyl)ruthenium (TBR)-labeled signal DNA. The linker DNA and signal DNA were modified on the surface of the AuNPs through Au?S bonds. The linker DNA can partly hybridize with the aptamers of cancer cells loaded onto the magnetic beads (MB1) to construct the magnetic biocomplexes. In the presence of the cancer cells, the aptamers conjugated with the cancer cells with higher affinity. The ECL nanoprobe was released from the biocomplexes and subsequently hybridized with the capture DNA loaded onto another magnetic bead (MB2) to form the magnetic nanocomposite. The nanocomposites can be easily separated and firmly attached to an electrode on account of their excellent magnetic properties. The ECL intensity of the TBR loaded onto the nanocomposites directly reflected the amount of cancer cells. By using cell lines of Burkitts lymphoma (Ramos cells) as a model, the ECL response was proportional to the cell concentration in the range from 5 to 100 cells?ml-1; a limit of detection as low as 5 cells?ml-1 of Ramos cells could be achieved. The proposed method described here is ideal for the diagnosis of cancers due to its high sensitivity, simplicity, and low cost.
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