Laboratory Medicine ›› 2015, Vol. 30 ›› Issue (8): 821-824.DOI: 10.3969/j.issn.1673-8640.2015.08.012

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Determinations of 25-hydroxyvitamin D2 and 25-hydroxyvitamin D3 in serum by liquid chromatography tandem-mass spectrometry

XU Fengxian, YU Jiaping.   

  1. Research and Development Laboratory, Shanghai Dian Medical Testing Institute, Shanghai 200433, China
  • Received:2015-01-23 Online:2015-08-30 Published:2015-08-28

Abstract:

Objective To establish a method for the determinations of 25-hydroxyvitamin D2[25(OH)D2]and 25- hydroxyvitamin D3[25(OH)D3] contents in serum by liquid chromatography tandem-mass spectrometry (LC-MS/MS). Methods After proteins in serum were precipitated by ethanol, liquid-liquid extraction by n-Hexane, then the residuals were re-dissolved in acetonitrile and analyzed by LC-MS/MS in the positive electrospray ionization(ESI+) mode and multiple reaction monitor(MRM) mode. The quantitative analysis for 25(OH)D2 and 25(OH)D3 contents was carried out by deuterium isotope as internal standard, and the methodology validation was performed. Results The within-run precision of 25(OH)D2 and 25(OH)D3 was 0.88%-7.69%, and between-run precision was 1.56%-9.90%. The good correlation coefficients were 0.999 1 and 0.999 9 at the concentration of 0.5-10.0 ng/mL 25(OH)D2 and 5-100 ng/mL 25(OH)D3, respectively. The accuracy of quality control materials of 25(OH)D2 and 25(OH)D3 was 95.5%-101.2%. 25(OH)D2 content did not have statistical significance(P>0.05), and 25(OH)D3 content had statistical significance(P<0.05)between males and females of 281 volunteers. Conclusions This method is sensitive, accurate and stable, satisfying the quantification requirements of 25(OH)D2 and 25(OH)D3 in serum, and it can be used in clinical analysis.

Key words: 25-hydroxyvitamin D2, 25-hydroxyvitamin D3, Liquid chromatography tandem-mass spectrometry, Internal standard method, Serum

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