[Study on immobilization of heparin on surface of Ti-O films and its antithrombogenicity].

Yajun Weng, Hongmei Tan, Nan Huang, Jin Wang, Junying Chen, Yongxiang Leng

Index: Sheng Wu Yi Xue Gong Cheng Xue Za Zhi 28(1) , 86-9, (2011)

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Abstract

Photoreactive heparin was synthesized by reaction of 4-azidoaniline and heparin. An organic layer was introduced on the surface of Ti-O by 3-aminopropylphosphonic acid assembling, and then the modified heparin was immobilized on the surface by UV irradiation. Water contact angle was used to characterize the hydrophilicity, quantitive assay was done by azure staining methods, and blood compatibility was evaluated by platelet adhesion experiment. Water contact angle of heparinized surface was smaller than that of Ti-O film, which indicated more hydrophilic property of heparinized surface. The surface density of heparin increased with the prolonging of irradiation time and the density was 2.1 microg/cm2 when irradiated for 300s. It showed the heparinized surface was effective in resisting platelets from adhesion and aggregation.