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In vitro biocompatibility assessment of sulfonated polyrotaxane‐immobilized polyurethane surfaces
Author(s) -
Park Hyung Dal,
Lee Won Kyu,
Ooya Tooru,
Park Ki Dong,
Kim Young Ha,
Yui Nobuhiko
Publication year - 2003
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.10505
Subject(s) - materials science , biocompatibility , ethylene glycol , polyurethane , surface modification , biomaterial , peg ratio , copolymer , polymer chemistry , chemical engineering , polyvinyl alcohol , polymer , nanotechnology , composite material , finance , economics , engineering , metallurgy
Sulfonated polyrotaxanes (PRx‐SO 3 's), in which sulfonated α‐cyclodextrins (α‐CDs) were threaded onto the poly(ethylene glycol) (PEG) segments in a PEG‐ b ‐poly(propylene glycol) (PPG)‐ b ‐PEG triblock copolymer (Pluronic) capped with benzyloxycarbonyl (Z)‐ L ‐phenylalanine (Z‐ L ‐Phe), were prepared as a novel surface‐modifying biomaterial. Surface modification of the polyurethane (PU) was carried out by blending the PRx‐SO 3 's with a PU solution, followed by solution casting. The incorporated PRx‐SO 3 's led to the enhanced hydrophilicity by changing the surface properties of the PU matrix. Modified PUs showed the stable entrapment of the PRx‐SO 3 's with little extraction into water and enhanced mechanical properties after exposure to water compared to the PU control. The incorporated PRx‐SO 3 's repelled the proteins and kept them from closely approaching the surface areas, prevented platelet activation by thrombin, and effectively repelled bacteria. These results suggest that both the supramolecular structure of the polyrotaxanes and exposure of the sulfonated groups onto the surfaces contribute to these phenomena. Thus, surface modification with PRx‐SO 3 's is suggested to be useful for the fabrication of biocompatible medical devices. © 2003 Wiley Periodicals, Inc. J Biomed Mater Res 66A: 596–604, 2003