标准物质
水溶液
甘油
化学
色谱法
同位素稀释
试剂
质谱法
检出限
有机化学
作者
Weiyan Zhou,Songlin Yu,Jie Zeng,Donghuan Wang,Tianjiao Zhang,Ying Yan,Jiangtao Zhang,Qinghui Meng,Yufei Wang,Wenxiang Chen
出处
期刊:Chinese Journal of Laboratory Medicine
[Chinese Medical Association]
日期:2017-07-11
卷期号:40 (07): 520-525
标识
DOI:10.3760/cma.j.issn.1009-9158.2017.07.010
摘要
Objective
Preparation of aqueous reference materials for cholesterol and glycerol.
Methods
Study on reference materials. The certified reference materials GBW09203b and GBW09149 were weighed accurately and dissolved into 20% of methyl cyclodextrin aqueous solution to prepare six kinds of candidate reference materials of cholesterol and glycerol according to the concentration. The materials were tested for homogeneity and stability using routine methods. The reference methods of isotope dilution liquid chromatography tandem mass spectrometry (ID-LC/MS/MS) were used to determine the concentration of cholesterol and glycerol to evaluate the accuracy of the certified values.Meanwhile, the blank verification test was carried out.The expanded uncertainty was the combination of standard uncertainty of measurement, unhomogeneity and instability.
Results
It showed that the six candidate reference materials were homogeneous and stable for at least 1 year at -70 ℃ and -20 ℃.The certified values (reference value ± expanded uncertainty, mmol/L) were as follows, for cholesterol: 0.65±0.01, 1.31 ±0.01, 2.57±0.02, 5.21±0.06, 7.71±0.08, 10.24±0.06; for glycerol: 0.29±0.01, 0.58±0.01, 1.22±0.02, 2.24±0.02, 3.46±0.04, 4.52 ±0.04. The results of reference methods were consistent with the certified values. Blank validation tests showed that the concentration of the analytes would not be affected by the reagent and the blank matrix.
Conclusions
Certified reference materials for cholesterol and glycerol in aqueous solution have been prepared successfully. These materials are homogeneous and stable, and the certified values are reliable. Therefore the materials have been approved to be the Certificate Reference Materials of GBW 09823, GBW 09824, GBW 09825, GBW09826, GBW09827 and GBW 09828.(Chin J Lab Med, 2017, 40: 520-525)
Key words:
Cholesterol; Triglycerides; Cyclodextrins; Solutions; Indicators and reagents; Reference standards; Tandem mass spectrometry
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