Physicochemical characterization of densely packed poly(ethylene glycol) layer for minimizing nonspecific protein adsorption.
Modification of the surface with densely packed poly(ethylene glycol) (PEG) brush layer was studied to improve the protein repellent ability of the surface. A PEG-brushed layer was constructed on a gold substrate using a PEG possessing a mercapto group at the chain end. The density of the PEG brushed layer substantially increased with repetitive adsorption/rinse cycles of the PEG on the gold substrate, allowing dramatic reduction of nonspecific protein adsorption. Notably, formation of a short, filler layer of PEG (2 kDa) in the preconstructed longer PEG brushed layer (5 kDa) achieved high density brush and almost complete prevention of nonspecific protein adsorption. On the other hand, surface modification with only long PEG chain (5 kDa) showed lower PEG brush density regardless of repetitive immobilization. Detailed characterization of the PEGylated surface was done from the physicochemical (QCM, contact angle, and SPR) as well as the biological (protein adsorption) point of view to highlight the relation between the PEG brush density and the protein repellent ability. Densely packed PEG surface which showed great protein repellent ability, presented in this study, suggests promising utility as engineered biomaterials including high-throughput screening and clinical diagnostics.
Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan.
Tomomi
T
Satomi
Yukio
Y
Nagasaki
Hisatoshi
H
Kobayashi
Tetsuya
T
Tateishi
Kazunori
K
Kataoka
Hidenori
H
Otsuka
D000327:Adsorption; D001665:Binding Sites; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D003460:Crystallization / Q000379:methods*; D006046:Gold / Q000737:chemistry; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D011092:Polyethylene Glycols / Q000737:chemistry*; D011485:Protein Binding; D011506:Proteins / Q000737:chemistry* / Q000648:ultrastructure*; D013499:Surface Properties
D020099:Coated Materials, Biocompatible; D046911:Macromolecular Substances; D011506:Proteins; D011092:Polyethylene Glycols; D006046:Gold