检验医学 ›› 2016, Vol. 31 ›› Issue (4): 282-285.DOI: 10.3969/j.issn.1673-8640.2016.04.008

• 临床应用研究·论著 • 上一篇    下一篇

邻-甲联苯胺法测定血浆游离血红蛋白的基质效应及消除方法

屠湧涛1, 刘清琳2, 徐敏敏1, 王莺1   

  1. 1.绍兴第二医院检验中心,浙江 绍兴 312000
    2.温州医科大学,浙江 温州 325035
  • 收稿日期:2015-08-13 出版日期:2016-04-30 发布日期:2016-05-12
  • 作者简介:null

    作者简介:屠湧涛,男,1966年生,学士,主任技师,主要从事实验室管理和临床生化检验工作。

Eliminating matrix effect in the determination of plasma free hemoglobin by o-methyl benzidine method

TU Yongtao1, LIU Qinglin2, XU Minmin1, WANG Ying1   

  1. 1.Shaoxing Second Hospital,Shaoxing 312000,Zhejiang,China
    2.Wenzhou Medical University,Wenzhou 325035,Zhejiang,China
  • Received:2015-08-13 Online:2016-04-30 Published:2016-05-12

摘要:

目的 研究邻-甲联苯胺法(经典方法)测定血浆游离血红蛋白(Hb)的基质效应及消除方法。方法 以用生理盐水1 000倍稀释的Hb储存液(浓度为103.1 g/L)作为标准液,将此Hb标准液再用无Hb血浆分别稀释500、1 000、2 000、4 000倍(游离Hb理论浓度分别为206.20、103.10、51.55、25.78 mg/L),然后用经典方法测定游离Hb浓度,比较与理论值的差异。将Hb储存液分别用生理盐水(经典方法)、无Hb血浆(消除方法1)、混合血浆(消除方法2)1 000倍稀释作为标准液。经典方法和消除方法1的计算公式为血浆游离Hb(mg/L)=测定管吸光度(A)值×标准液浓度÷标准管A值;消除方法2的计算公式为血浆游离Hb(mg/L)=测定管A值×标准液浓度÷(标准管A值×混合血浆A值);消除方法3操作同经典方法,计算公式为血浆游离Hb(mg/L)=测定管A值×标准液浓度×2.35÷标准管A值。测定40份标本,比较各消除方法的结果。在血浆中分别加入206.20、103.10、51.55 mg/L Hb,测定各消除方法的回收率。分别取6.25、12.50、25.00、50.00 μg/L维生素C溶液4.5 mL,各加1.031 g/L Hb标准液0.5 mL,用经典方法测定回收率。结果 采用无Hb血浆500、1 000、2 000、4 000倍稀释的Hb标准液的游离Hb测定结果分别为87.85、43.16、21.90、10.99 mg/L。40份标本采用经典方法、消除方法1、消除方法2、消除方法3测定的游离Hb浓度分别为(7.99±4.90)、(18.61±11.42)、(19.18±11.77)、(18.77±11.52)mg/L;消除方法1、消除方法2、消除方法3的结果均高于经典方法(P均<0.01),但3种消除方法之间差异均无统计学意义(P均>0.05)。经典方法、消除方法1、消除方法2、消除方法3的平均回收率分别为42.54%、98.33%、100.98%、97.56%。采用经典方法检测Hb在6.25、12.50、25.00、50.00 μg/L维生素C溶液中的回收率分别为98.57%、98.17%、97.17%、95.16%。结论 邻-甲联苯胺法测定血浆游离Hb存在基质效应,3种消除方法均可消除基质效应影响。

关键词: 游离血红蛋白, 基质效应, 邻-甲联苯胺法

Abstract:

Objective To study the matrix effect of o-methyl benzidine method (classic method)in determining plasma free hemoglobin (Hb)and the eliminating methods. Methods Hb storage solution diluted 1 000 times by normal saline (concentration was 103.1g/L)was used as standard,while the standard diluted by Hb-free plasma 500,1 000,2 000 and 4 000 times(theoretical concentrations were 206.20,103.10,51.55 and 25.78 mg/L)was determined by classic method for plasma free Hb. The results were compared with theoretical values. Hb storage solution diluted 1 000 times by normal saline(classic method), Hb-free plasma(eliminating method 1) and mixed plasma(eliminating method 2)was used as standard. The equation of classic method and eliminating method 1 was plasma free Hb(mg/L)=test tube absorbance(A)× concentration of standard ÷ standard tube A. The equation of eliminating method 2 was plasma free Hb(mg/L)= test tube A×concentration of standard ÷ (standard tube A× mixed plasma A). The equation of eliminating method 3 was plasma free Hb(mg/L)= test tube A× concentration of standard ×2.35÷standard tube A. A total of 40 specimens were determined,and the results of different eliminating methods were compared. Hb of 206.20, 103.10 and 51.55 mg/L were added into plasma,and the recovery rate of each method was determined. Adding 0.5 mL of 1.031 g/L standard,in 4.5 mL of vitamin C solution of 6.25,12.50,25.00 and 50.00 μg/L, the recovery rate was determined by classic method. Results The theoretical values of plasma free Hb were 87.85, 43.16, 21.90 and 10.99 mg/L for standard diluted by Hb-free plasma 500,1 000,2 000 and 4 000 times. As to 40 specimens,plasma free Hb concentrations of classic method, eliminating method 1,eliminating method 2 and eliminating method 3 were(7.99±4.90),(18.61±11.42),(19.18±11.77) and(18.77±11.52)mg/L,the results of eliminating method 1,eliminating method 2 and eliminating method 3 were higher than that of classic method(P<0.01),and there was no statistical significance among the 3 eliminating methods(P>0.05). The average recovery rates of classic method, eliminating method 1 ,eliminating method 2 and eliminating method 3 were 42.54%, 98.33%, 100.98% and 97.56%. The recovery rates of vitamin C solution of 6.25,12.50,25.00 and 50.00 μg/L were 98.57%,98.17%,97.17% and 95.16%. Conclusions There is matrix effect of o-methyl benzidine method in determining plasma free Hb, and the 3 eliminating methods are effective.

Key words: Free hemoglobin, Matrix effect, o-Methyl benzidine method

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