title: Preparation and evaluation of PEO-coated materials for a microchannel hemodialyzer.
abstract: The marked increase in surface-to-volume ratio associated with microscale devices for hemodialysis leads to problems with hemocompatibility and blood flow distribution that are more challenging to manage than those encountered at the conventional scale. In this work stable surface modifications with pendant polyethylene oxide (PEO) chains were produced on polydimethylsiloxane (PDMS), polycarbonate microchannel, and polyacrylonitrile membrane materials used in construction of microchannel hemodialyzer test articles. PEO layers were prepared by radiolytic grafting of PEO-polybutadiene-PEO (PEO-PB-PEO) triblock polymers to the material surfaces. Protein repulsion was evaluated by measurement of surface-bound enzyme activity following contact of uncoated and PEO-coated surfaces with β-galactosidase. Protein adsorption was decreased on PEO-coated polycarbonate and PDMS materials to about 20% of the level recorded on the uncoated materials. Neither the triblocks nor the irradiation process was observed to have any effect on protein interaction with the polyacrylonitrile membrane, or its permeability to urea. This approach holds promise as a means for in situ application of safe, efficacious coatings to microfluidic devices for blood processing that will ensure good hemocompatibility and blood flow distribution, with no adverse effects on mass transfer.
authors.affiliation: School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, Oregon, 97331.
authors.forename: Keely
authors.initials: K
authors.lastname: Heintz
authors.forename: Karl F
authors.initials: KF
authors.lastname: Schilke
authors.forename: Joshua
authors.initials: J
authors.lastname: Snider
authors.forename: Woo-Kul
authors.initials: WK
authors.lastname: Lee
authors.forename: Mitchell
authors.initials: M
authors.lastname: Truong
authors.forename: Matthew
authors.initials: M
authors.lastname: Coblyn
authors.forename: Goran
authors.initials: G
authors.lastname: Jovanovic
authors.forename: Joseph
authors.initials: J
authors.lastname: McGuire
mesh_terms: D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D007688:Kidneys, Artificial; D011076:Polycarboxylate Cement / Q000737:chemistry*; D011092:Polyethylene Glycols
chemical_list: D020099:Coated Materials, Biocompatible; D004129:Dimethylpolysiloxanes; D011076:Polycarboxylate Cement; C005506:polycarbonate; D011092:Polyethylene Glycols; C013830:baysilon
keywords: PEO-polybutadiene-PEO triblock polymer; polyacrylonitrile membrane; polycarbonate; protein repulsion; urea permeability