Determination and Uncertainty Assessment of Lactic Acid in Serum
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摘要: 建立一种同位素稀释-气相色谱-质谱法测定血清中乳酸含量的方法,并对测量结果的不确定度进行评定。在血清样品中加入乳酸钠同位素标记物作为内标,样品经前处理及硅烷化衍生后,在选择离子扫描模式下用气相色谱串联质谱仪检测。采用建立的方法对五种不同浓度水平的血清中乳酸进行定量分析,结果表明方法线性良好,相关系数 $ r > 0.999 $,平均加标回收率为 101.2%~102.6%,相对标准偏差为 0.16%~0.59%(n = 6),五种浓度水平的血清中乳酸含量分别为1.16、2.01、5.50、10.02、15.63 mmol/L,结果的相对扩展不确定度 Urel 均小于 3.0%(k = 2)。方法重复性好、准确度高、结果可靠,可用于临床血清样品中乳酸含量的准确检测。Abstract: An isotope dilution-gas chromatography-mass spectrometry method for the determination of lactic acid concentration in serum was established, and the uncertainty of the measurement results was evaluated. Sodium lactate isotope label was added to the serum sample as internal standard. After pretreatment and silanization derivatization, samples were detected by gas chromatography-tandem mass spectrometry in selected ion monitoring mode. The established quantitative analysis method was used to analyze five different concentrations of lactic acid in serum. The results showed that the method had good linearity, and the correlation coefficient was r>0.999. The average spike recovery rate was 101.2%~102.6%, and the relative standard deviation was 0.16%~0.59 % (n = 6). The concentration of lactic acid in five different serum was 1.16 mmol/L, 2.01 mmol/L, 5.50 mmol/L, 10.02 mmol/L, and 15.63 mmol/L, and the related expanded uncertainty Urel of the results was less than 3.0% (k = 2). The method had good repeatability, high accuracy, reliable results, which could be used for accurate detection of lactic acid concentration in clinical serum sample.
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表 1 五种乳酸浓度血清的测定
Table 1. Detection of the concentration of lactic acid in five different serum
乳酸浓度水平(mmol/L) 1 2 5 10 15 线性方程 y =1.0257x+0.0342 y=1.0326x+0.0553 y=1.0694x−0.0014 y=0.9854x+0.0838 y=1.0329x+0.0394 相关系数 r 1.0000 0.9998 0.9996 0.9999 0.9999 血清中乳酸浓度(mmol/L) 1.16 2.01 5.50 10.02 15.63 RSD 0.27% 0.31% 0.40% 0.23% 0.23% 表 2 五种乳酸浓度水平的加标回收率
Table 2. Recovery rates of added standards for five different lactic acid concentration
乳酸添加水平(mmol/L) 1 2 5 10 15 平均加标回收率(%) 101.3 101.8 101.2 102.5 102.6 RSD(%) 0.60 0.36 0.16 0.21 0.26 表 3 稳定同位素稀释气相色谱质谱法测定血清中乳酸不确定度汇总
Table 3. Summary of uncertainty in the determination of lactic acid in serum by stable isotope dilution gas chromatography mass spectrometry
不确定度分量 乳酸浓度 1 mmol/L 2 mmol/L 5 mmol/L 10 mmol/L 15 mmol/L 质量比值 Rs 引入的相对标准不确定度 $ {u}_{\mathrm{r}\mathrm{e}\mathrm{l}}\left({R}_{\mathrm{s}}\right) $ 0.24% 0.36% 0.36% 0.44% 0.25% 血清体积引入的相对标准不确定度 $ {u}_{\mathrm{r}\mathrm{e}\mathrm{l}}\left[V\left(\mathrm{s}\mathrm{e}\mathrm{r}\mathrm{u}\mathrm{m}\right)\right] $ 0.035% 0.035% 0.035% 0.035% 0.035% 测量重复性引入的相对标准不确定度 $ {u}_{\mathrm{r}\mathrm{e}\mathrm{l}}\left[c\left(\mathrm{s}\mathrm{e}\mathrm{r}\mathrm{u}\mathrm{m}\right)\right] $ 0.10% 0.11% 0.15% 0.083% 0.080% 加标回收率引入的相对标准不确定度$ {u}_{\mathrm{r}\mathrm{e}\mathrm{l}}\left(\overline{Re}\right) $ 0.79% 1.04% 0.68% 1.43% 1.44% 分析方法的相对标准不确定度 $ {u}_{\mathrm{r}\mathrm{e}\mathrm{l}}\left({\mathrm{L}\mathrm{A}}_{\mathrm{I}\mathrm{D}-\mathrm{G}\mathrm{C}\mathrm{M}\mathrm{S}}\right) $ 0.83% 1.11% 0.78% 1.50% 1.46% 分析方法的相对扩展不确定度Urel(k = 2) 1.7% 2.3% 1.6% 3.0% 3.0% -
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