在pH=6.2的Na2HPO4-NaH2PO4缓冲溶液中,羊抗人纤维蛋白原血清与纤维蛋白原(Fg)发生特异性结合,产生抗体抗原免疫复合物微粒,导致体系在340 nm处的共振散射峰增强. 当纤维蛋白原质量浓度在1.33×10-7~5.33×10-6 g/mL范围内,随着纤维蛋白原浓度c的增加340 nm处的共振散射强度线性增强,回归方程为ΔI340 nm=12.17c+3.35,相关系数为0.998 6,其检出限(3σ)为2.8×10-8 g/mL Fg. 考察了18种共存物质的干扰. 结果表明,方法具有较高的选择性. 方法用于定量分析人血浆中的纤维蛋白原,相对标准偏差在2.2%~2.3%之间,测定结果与人体正常血浆中纤维蛋白原含量基本一致.
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