期刊
BIOSENSORS & BIOELECTRONICS
卷 25, 期 7, 页码 1609-1614出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2009.11.022
关键词
Aptamer; Magnetic beads; Leukemia cell; Quartz crystal microbalance
类别
资金
- National Natural Science Foundation of China [20905024, 20805013, 20907013, J0830415]
- Natural Science Foundation of Hunan Province [09JJ4007, 09JJ4006]
A novel method for selective collection and detection of human acute leukemia cells has been proposed using aptamer-conjugated magnetic beads (apt-MBs) and a magnet-quartz crystal microbalance (QCM) system. The sgc8c aptamer-conjugated MBs specifically binding to CCRF-CEM cells were used for target cell extraction from complex matrixes, and the magnet-QCM system was successfully applied for quantitative cell detection, requiring no further labeling of cells. The accumulation of MBs-conjugated CCRF-CEM cells on a quartz crystal gold electrode surface under a magnetic field resulted in decreased resonant frequency. A linear relationship between the frequency shift and cell concentration over the range of 1 x 10(4)-1.5 x 10(5) cells mL(-1) was obtained, with a detection limit of 8 x 10(3) cells mL(-1). The applicability of the method for target cell detection from cell mixture was satisfactory. (C) 2009 Elsevier B.V. All rights reserved.
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