title: Superlow fouling sulfobetaine and carboxybetaine polymers on glass slides.
abstract: This work describes the superlow fouling properties of glass slides grafted with zwitterionic polymers to highly resist the adsorption of proteins and the adhesion of mammalian cells. Glass slides were first silanized using 2-bromo-2-methyl-N-3-[(triethoxysilyl)propyl]propanamide (BrTMOS). Two zwitterionic polymers, poly(sulfobetaine methacrylate) (polySBMA) and poly(carboxybetaine methacrylate) (polyCBMA), were then grafted from the silanized glass substrates using the atom-transfer radical polymerization (ATRP) method. X-ray photoelectron spectroscopy (XPS) was used to analyze the surfaces of the silanized glass substrates and the substrates grafted with the polymers. An enzyme-linked immonosobrbent assay (ELISA) using polyclonal antibodies was used to measure fibrinogen adsorption on these surfaces. The surfaces with polySBMA or polyCBMA layers were shown to reduce fibrinogen adsorption to a level comparable with that of adsorption on poly(ethylene glycol)-like films. Bovine aortic endothelial cells (BAECs) were seeded on these surfaces. The attachment and spreading of the cells were observed only on unpolymerized glass surfaces. This work further demonstrates that zwitterionic polymers highly resist nonspecific protein adsorption and cell adhesion and provides an effective method to modify glass slides or other oxide surfaces to achieve superlow fouling.
authors.affiliation: Department of Chemical Engineering and Department of Bioengineering, University of Washington, Seattle, Washington 98195, USA.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zhang
authors.forename: Timothy
authors.initials: T
authors.lastname: Chao
authors.forename: Shengfu
authors.initials: S
authors.lastname: Chen
authors.forename: Shaoyi
authors.initials: S
authors.lastname: Jiang
mesh_terms: D000327:Adsorption; D000818:Animals; D001622:Betaine / Q000031:analogs & derivatives* / Q000737:chemistry*; D002417:Cattle; D002448:Cell Adhesion; D005340:Fibrinogen / Q000737:chemistry / Q000378:metabolism; D005898:Glass / Q000737:chemistry*; D006801:Humans; D008956:Models, Chemical; D010087:Oxides / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry; D013052:Spectrometry, X-Ray Emission; D013499:Surface Properties
chemical_list: D010087:Oxides; D011108:Polymers; D012821:Silanes; D001622:Betaine; C483727:sulfobetaine; D005340:Fibrinogen