融合蛋白FP3等电点毛细管等电聚焦电泳分析方法的建立Development of capillary isoelectric focusing electrophoresis method for analysis of isoelectric point of fusion protein FP3
李响;高向东;田宏;饶春明;
摘要(Abstract):
目的建立融合蛋白FP3等电点毛细管等电聚焦(Capillary isoelectric focusing,cIEF)电泳分析方法。方法采用中性涂层的毛细管,有效长度为20 cm,总长度为30 cm,内径为50μm;分离温度20℃;检测波长280 nm;20 Psi压力进样99 s,电压20 kV分离聚焦20 min,电压25 kV化学迁移25 min。比较不同两性电解质(PharmalyteTM3-10和AmpholineTM3.5-10)、增溶剂类型及浓度、聚焦电压(15、20、30 kV)对样品分离效果的影响,并验证系统的适应性、方法的重现性及系统的稳定性。结果建立的cIEF方法可使样品的电荷异构体有效分离,样品主峰与次主峰的分离度为1.249(USP)。AmpholineTM3.5-10可使样品的各个电荷异质性组分更有效地分离;6 mol/L尿素能提供良好的增溶环境;20 kV聚焦电压即可获得良好的分离效果。连续5次进样,主峰和次主峰迁移时间相对标准偏差(RSD)分别为1.29%和1.32%,样品主区带等电点范围为6.33~6.90,样品在24 h内检测结果稳定。结论建立了融合蛋白FP3等电点cIEF分析方法,该方法具有分离度高、重现性好、方法稳定和结果准确等优点,为该类制品的质量控制提供了更好的手段。
关键词(KeyWords): 毛细管等电聚焦电泳;融合蛋白;等电点
基金项目(Foundation): 国家863计划资助项目(2007AA021601);; 重大新药创制资助项目(2009ZX09307)
作者(Authors): 李响;高向东;田宏;饶春明;
DOI: 10.13200/j.cjb.2012.04.100.lix.015
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