期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 160, 期 1, 页码 349-356出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.07.060
关键词
Piezoelectric microcantilever; Longitudinal extension mode; Cancer antigen detection; Her2; Label-free; Dissociation constant
资金
- National Institute of Health (NIH) [R01 EB000720]
- NCI [R01 CA118159]
- Bernard A. Foundation
- Rebecca S. Bernard Foundation
We have investigated real-time, label-free, in situ detection of human epidermal growth factor receptor 2 (Her2) in diluted serum using the first longitudinal extension mode of a lead zirconate-lead titanate (PZT)/glass piezoelectric microcantilever sensor (PEMS) with H3 single-chain variable fragment (scFv) immobilized on the 3-mercaptopropyltrimethoxysilane (MPS) insulation layer of the PEMS surface. We showed that with the longitudinal extension mode, the PZT/glass PEMS consisting of a 1 mm long and 127 mu m thick PZT layer bonded with a 75 mu m thick glass layer with a 1.8 mm long glass tip could detect Her2 at a concentration of 6-60 ng/ml (or 0.06-0.6 nM) in diluted human serum, about 100 times lower than the concentration limit obtained using the lower-frequency flexural mode of a similar PZT/glass PEMS. We further showed that with the longitudinal mode, the PZT/glass PEMS determined the equilibrium H3-Her2 dissociation constant K-d to be 3.3 +/- 0.3 x 10(-8)M consistent with the value, 3.2 +/- 0.28 x 10(-8) M deduced by the surface plasmon resonance method (BlAcore). (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据