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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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聚丙烯微孔膜表面肝素化及其对低密度脂蛋白的吸附特性
DOI: 10.3724/SP.J.1105.2011.10271, PP. 791-798
Keywords: 聚丙烯微孔膜,表面修饰,肝素化,低密度脂蛋白(LDL)吸附
Abstract:
为了赋予聚丙烯微孔膜(PPMM)选择性吸附低密度脂蛋白(LDL)的能力,发展了一种有效的PPMM表面共价固定肝素的方法.基于紫外引发丙烯酸的接枝聚合,通过碳二亚胺活化,以乙二胺为间隔臂,将肝素共价固定于PPMM表面,获得表面肝素化的PPMM.ATR-FTIR和XPS分析确证了修饰过程中膜表面基团及化学成分的变化.采用静态水接触角测定和血小板黏附实验,考察了肝素化前后膜表面的亲水性及血液相容性,发现在肝素固定化密度为7.39μg/cm2时,膜表面水接触角由(138±7.2)°下降至(35.1±2.7)°,血液相容性也得到明显改善.以酶联免疫吸附测定技术(ELISA)分析了肝素化前后PPMM对单及二元混合蛋白溶液中LDL的吸附与脱吸附性能.结果表明,肝素化PPMM对LDL的吸附量明显增大,且受人血清蛋白(HSA)的干扰较小,说明肝素化PPMM对LDL具有选择性吸附性能;NaCl溶液能将肝素化PPMM表面吸附的LDL洗脱除去,说明肝素化PPMM对LDL的吸附具有可逆性.
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