Silicon surface modification with a mixed silanes layer to immobilize proteins for biosensor with imaging ellipsometry.
One kind of surface modification method on silicon wafer was presented in this paper. A mixed silanes layer was used to modify silicon surface and rendered the surface medium hydrophobic. The mixed silanes layer contained two kinds of compounds, aminopropyltriethoxysilane (APTES) and methyltriethoxysilane (MTES). A few of APTES molecules in the layer was used to immobilize covalently human immunoglobulin G (IgG) on the silicon surface. The human IgG molecules immobilized covalently on the modified surface could retain their structures well and bind more antibody molecules than that on silicon surface modified with only APTES. This kind of surface modification method effectively improved the sensitivity of the biosensor with imaging ellipsometry.
Wang
Zhan-Hui
ZH
National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, 15, Bei-si-huan West Road, Beijing 100080, PR China.
Jin
Gang
G
D015374:Biosensing Techniques; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007118:Immunoassay; D007074:Immunoglobulin G / Q000737:chemistry; D011485:Protein Binding; D012821:Silanes / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D013499:Surface Properties
D007074:Immunoglobulin G; D012821:Silanes; D012825:Silicon