title: Deposition of PEG onto PMMA microchannel surface to minimize nonspecific adsorption.
abstract: A protein-resistant surface has been constructed on the poly(methyl methacrylate) (PMMA) microfluidic chips based on a one-step modification. The copolymer of butyl methacrylate (BMA) and poly(ethylene glycol) methyl ether methacrylate (PEGMA) is synthesized to introduce a dense PEG molecular brush-like coating on the PMMA microchannel surfaces via the anchoring effect of the hydrophobic BMA units. The PEGMA segments could produce hydrophilic domains formed on the interface so as to achieve stable electroosmotic flow, and less nonspecific adsorption toward biomolecules. The modification procedure and the properties of the poly(BMA-co-PEGMA)-coated surface have been characterized by FT-IR spectroscopy, confocal fluorescence microscopy, X-ray photoelectron spectroscopy and scanning electron microscopy. The water contact angle and electroosmotic flow of PEG-modified PMMA microchip are measured to be 36 degrees and 5.4 x 10(-4) cm(2) V(-1) s(-1), while those of 73 degrees and 1.9 x 10(-4) cm(2) V(-1) s(-1) for native one, respectively. The PEG-modified microchip has been applied for the electrophoresis separation of proteins, corresponding to the theoretical efficiencies about 16 300 and 412 300 plates m(-1). In the interest of achieving efficient separation while minimizing biofoulings from the serum and plasma, the fabrication of PEG-coated microfluidic chips would provide a biocompatible platform for complex biological analysis.
authors.affiliation: Department of Chemistry, Fudan University, Shanghai 200433, People's Republic of China.
authors.forename: Hongyan
authors.initials: H
authors.lastname: Bi
authors.forename: Sheng
authors.initials: S
authors.lastname: Meng
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Kai
authors.initials: K
authors.lastname: Guo
authors.forename: Yupeng
authors.initials: Y
authors.lastname: Chen
authors.forename: Jilie
authors.initials: J
authors.lastname: Kong
authors.forename: Pengyuan
authors.initials: P
authors.lastname: Yang
authors.forename: Wei
authors.initials: W
authors.lastname: Zhong
authors.forename: Baohong
authors.initials: B
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D008689:Methacrylates / Q000737:chemistry; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation / Q000379:methods*; D011092:Polyethylene Glycols / Q000737:chemistry*; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D011506:Proteins / Q000302:isolation & purification; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties
chemical_list: D008689:Methacrylates; D011506:Proteins; D011092:Polyethylene Glycols; D019904:Polymethyl Methacrylate; C016284:butyl methacrylate