期刊
SCIENCE IN CHINA SERIES F-INFORMATION SCIENCES
卷 49, 期 3, 页码 397-408出版社
SCIENCE PRESS
DOI: 10.1007/s11432-006-0397-z
关键词
amperometric immunosensor; micro electromechanical systems (MEMS); self-assembled monolayers (SAMs); protein A; orientation-controlled immobilization; biosensor system-on-a-chip
A novel amperometric immunosensor based on the micro electromechanical systems (MEMS) technology, using protein A and self-assembled monolayers (SAMs) for the orientation-control led immobilization of antibodies, has been developed. Using MEMS technology, an Au, Pt, Pt three-microelectrode system enclosed in a SU-8 micro pool was fabricated. Employing SAMs, a monolayer of protein A was immobilized on the cysteamine modified Au electrode to achieve the orientation-control led immobilization of the human immunoglobulin (HIgG) antibody. The immunosensor aimed at low unit cost, small dimension, high level of integration and the prospect of a biosensor system-on-a-chip. Cyclic voltammetry and chronoamperometry were conducted to characterize the immunosensor. Compared with the traditional immunosensor using bulky gold electrode or screen-printed electrode and the procedure directly binding protein A to electrode for immobilization of antibodies, it had attractive advantages, such as miniaturization, compatibility with CIVICS technology, fast response (30 s), broad linear range (50-400 mu g/L) and low detection limit (10 mu g/L) for HIgG. In addition, this immunosensor was easy to be designed into micro array and to realize the simultaneously multi-parameter detection.
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