Abstract
The grating substrate covered with a metal layer, a plasmonic chip, and a bispecific antibody can play a key role in the sensitive detection of a marker protein with an immunosensor, because of the provision of an enhanced fluorescence signal and the preparation of a sensor surface densely modified with capture antibody, respectively. In this study, one of the tumor markers, a soluble epidermal growth factor receptor (sEGFR), was selected as the target to be detected. The ZnO- and silver-coated plasmonic chip with precise regularity and the appropriate duty ratio in the periodic structure further enhanced the fluorescence intensity. As for sensor surface modification with capture antibody, a bispecific antibody (anti-sEGFR and anti-ZnO antibody), the concentrated bispecific antibody solution was found to nonlinearly form a surface densely immobilized with antibody, because the binding process of a bispecific antibody to the ZnO surface can be a competitive process with adsorption of phosphate. As a result, the interface on the plasmonic chip provided a 300× enhanced fluorescence signal compared with that on a ZnO-coated glass slide, and therefore sEGFR was found to be quantitatively detected in a wide concentration range from 10 nM to 700 fM on our plasmonic surface.
Original language | English |
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Pages (from-to) | 8628-8632 |
Number of pages | 5 |
Journal | ACS Applied Materials and Interfaces |
Volume | 5 |
Issue number | 17 |
DOIs | |
Publication status | Published - 2013 Sep 11 |
Keywords
- bispecific antibody
- enhanced fluorescence
- grating
- immunosensor
- plasmonic chip
- zinc oxide
ASJC Scopus subject areas
- Materials Science(all)