Synthesis and antithrombogenicity of heparinized polyurethanes with intervening spacer chains of various kinds.
Heparin was immobilized to polyetherurethaneurea membrane by covalent or ionic bondings with intervening spacer chains having different lengths and different terminal functional groups. The amount of immobilization of heparin and the release rate of immobilized heparin were controlled by the nature and the mode of bonding of spacer chains. The heparinized polyetherurethaneurea membranes became more in vitro antithrombogenic and suppressed more strongly the adhesion and activation of platelets, as the amount of immobilization increased. It was also shown that the membrane to which the low-molecular-weight fraction of heparin was immobilized was less stimulating to platelets.
Liu
L S
LS
Department of Polymer Chemistry, Kyoto University, Japan.
Ito
Y
Y
Imanishi
Y
Y
D000818:Animals; D001777:Blood Coagulation / Q000187:drug effects*; D001792:Blood Platelets / Q000378:metabolism; D004285:Dogs; D006493:Heparin / Q000737:chemistry* / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D008567:Membranes, Artificial; D008970:Molecular Weight; D010973:Platelet Adhesiveness / Q000187:drug effects; D011140:Polyurethanes / Q000138:chemical synthesis* / Q000737:chemistry; D011930:Reaction Time; D012701:Serotonin / Q000378:metabolism; D013499:Surface Properties
D008567:Membranes, Artificial; D011140:Polyurethanes; D012701:Serotonin; D006493:Heparin; C044690:polyetherurethane urea