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ghd stijltang 一种新&#3034

 
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Cholerny Spammer



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PostPosted: Wed 18:24, 23 Mar 2011    Post subject: ghd stijltang 一种新&#3034

一种新的改良法测定血清总铁结合力
每天上、下午各测定1次,[link widoczny dla zalogowanych],连续l0天,测得血清TIBC值为(63.6±3.43)gmol/L,批间CV为5.4%。2.6方法对比试验用本法(y)和碳酸镁作吸附剂的手工法,()测定38份血清标本TIBC含量,经统计学处理,回归方程为Y=I.025X+0.927,r=0.990。经配对资料t检验,两者差异无显著性(P>0.05),[link widoczny dla zalogowanych]。2.7干扰试验在TIBC含量58.7gmol/L的混合血清中加入胆红素浓度为256gmol/L、Mn2100gmol/L、Cu“100gmol/L、lib浓度为200ms/L时,对本法的测定没有干扰。轻度脂血,甘油三酯(TG)<3.5mmol/L亦无干扰。2.8参考范围用本法测定56例健康者血清TIBC含量,结果为(61.4±6.88)gmol/L,参考范围±2s,47.6~75.Igmol/L。3讨论血清TIBC直接表示血清中转铁蛋白利用铁的生理活性,因而比免疫学方法测定转铁蛋白含量具有更重要的临床意义,近来血清TIBC指标重新得到临床的重视。常规测定TIBC的方法及多种改良法中需采用碳酸镁、铁交换树脂、氧化铝等吸附剂吸附多余未结合的铁,[link widoczny dla zalogowanych],经离心去除吸附剂再显色测定。此类方法标本用量大,[link widoczny dla zalogowanych],操作较繁琐,影响结果的因素较多。Hachim等报道了血清TIBC直接测定法…,[link widoczny dla zalogowanych],但要使用有特殊加样功能的全自动生化分析仪,不适合于国内常规实验室应用。本文采用改变反应体系中的pH值,使中性条件下转铁蛋白对铁的吸附反应、在酸性条件下转铁蛋白释放结合铁以及铁的还原、显色反应可以连续进行,不需去除多余的铁,简化了操作步骤,使结果准确可靠,仅需普通可见分光光度计,更适用于常规实验室。转铁蛋白在酸性条件下释放结合的铁离子速度与反应体系中pH值有关,当反应体系中pH过高时,铁离子释放不完全,pH过低时,血清蛋白易发生沉淀使溶液浑浊。本法选择pH4.0条件下使转铁蛋白释放结合的铁离子,既保证铁的完全释放,又保证蛋白不发生沉淀,使反应体系保持清亮。有报道标本溶血对测定TIBC有负干扰…,本研究结果表明血红蛋白在实验浓度范围内未发现有干扰现象。原因可能是本法采用了单波长测定法,避免了文献双波长法测定中因血红蛋白酸化使副波长处吸光度升高而引起的负干扰现象…。操作时注意防止铁污染。试管、吸管、比色皿必须经l0%HCI浸泡过夜,洗净干燥备用。[
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