类金刚石薄膜血液相容性与蛋白吸附的关系研究

以金刚石薄膜 ( DF)和石墨为参比材料 ,采用放射性同位素 1 2 5I标记技术 ,研究了人血白蛋白 ( HSA)、纤维蛋白原 ( HFG)和免疫球蛋白 ( Ig G)在类金刚石薄膜 ( DL C)表面单一蛋白的等温吸附和二元蛋白体系的竞争吸附。结果显示 :( 1)随着蛋白浓度的增加 ,三种蛋白在三种材料表面的吸附量增加 ,并趋于吸附平衡 ;( 2 )石墨对三种蛋白的吸附量远高于 DL C和 DF;( 3 ) DL C对 HSA的吸附活性高于 DF,而 DF、石墨对 HFG、Ig G的吸附活性则明显高于 DL C;( 4) DL C对三种蛋白的吸附能力相差不大 ,而 DF和石墨对 HFG、Ig G的吸附量则显著高于 HSA;( 5 )三种蛋白在 DF和石墨表面的相对竞争吸附能力为 HFG>Ig G>HSA,而对于 DL C,这一顺序则为 HFG≈ HSA>Ig G,HFG对 HSA没有表现出明显的竞争吸附优势。这些结果表明 :DL C对三种血浆蛋白的吸附是非特异性的 ,而DF和石墨则不同程度地优先吸附 HFG和 Ig G,从而在分子水平上阐释了 DL C血液相容性好于 DF和石墨的内在原因

Study on Relationship between Hemocompatibility and Protein Adsorption for DLC

In this paper, the adsorption of human serum albumin(HSA), human serum fibrinogen (HFG) and human serum immunoglobin(IgG) on diamond like carbon film(DLC) has been studied in comparison with diamond film (DF) and graphite. The isothermal adsorption of the protein solution with single component and the competitive adsorption of binary protein system have been investigated by radio isotope 125I labelling method. Results showed that (1) the adsorptive amounts of three proteins on three material surfaces are all increased with the increasing concentration of protein solution, then the adsorption tends to reach an equilibrium; (2) the adsorptive amounts of three protein on graphite far exceed that on DLC and DF; (3) the adsorptive amounts of HSA on DLC are more than that on DF, while the adsorptive amounts of HFG and IgG on DF and graphite are apparently more than that on DLC; (4) the differences among the adsorptive amounts of three proteins on DLC are small, but adsorptive amounts of HFG and IgG on DF and graphite are much more than that of HSA; (5) the relative competitive adsorption ability of three proteins on DF and graphite is HFG > IgG > HSA, but on DLC, the sequence is HFG approximately HSA > IgG. Comparing with HSA, HFG has no apparent competitive adsorption superiority to DLC. These results indicate that there is no apparent difference for the adsorption of three human serum proteins on DLC, but the adsorption of HFG and IgG on DF and graphite takes precedence of various degrees. It probably makes a rational explanation for the result of hemocompatibility tests in vitro that DLC is superior to, DF and graphite.