期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 360, 期 2, 页码 593-599出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.05.030
关键词
Silica nanoparticle; Copolymer brush; Protein microarray; Signal amplification
资金
- Institute for Clean Energy & Advanced Materials, Southwest University, Chongqing, PR China
- Center for Advanced Bionanosystems, Nanyang Technological University, Singapore
Great challenge remains to continuously improve sensitivity of protein microarrays for broad applications. A copolymer brush is in situ synthesized on both substrate and silica nanoparticle (SNP) surface to efficiently immobilize probe and reporter protein respectively for synergistic amplification of protein microarray signals. As a demonstration, sandwich immunoassay for a cancer biomarker carcinoembryonic antigen (CEA) detection is performed on microarray platform, showing a limit of detection (LOD) of 10 pg/ml and dynamic range of 10 pg/ml to 100 ng/ml. Two orders improvement of LOD is achieved in comparison to the small crosslinker-activated substrate. The improved sensitivity is attributed to not only the high immobilization amount of both probe and reporter but also the favorite protein binding orientations offered by the flexible brushes. This work provides a universal approach to inexpensively and significantly improve protein microarray sensitivity. (C) 2011 Elsevier Inc. All rights reserved.
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