Liebisch, Gerhard and Matysik, Silke (2015) Accurate and reliable quantification of 25-hydroxy-vitamin D species by liquid chromatography high-resolution tandem mass spectrometry. JOURNAL OF LIPID RESEARCH, 56 (6). pp. 1234-1239. ISSN 0022-2275, 1539-7262
Full text not available from this repository. (Request a copy)Abstract
In general, mass spectrometric quantification of small molecules in routine laboratory testing utilizes liquid chromatography coupled to low mass resolution triple-quadrupole mass spectrometers (QQQs). Here we introduce high-resolution tandem mass spectrometry (quadrupole-Orbitrap) for the quantification of 25-hydroxy-vitamin D [25(OH)D], a marker of the vitamin D status, because the specificity of 25(OH) D immunoassays is still questionable and mass spectrometric quantification is becoming increasingly important. Liquid chromatography coupled to high-resolution tandem mass spectrometry (LC-MS/HR-MS) was used to quantify 25-hydroxy-cholecalciferol [25(OH)D-3], 25-hydroxy-ergocalciferol [25(OH)D-2], and their C3-epimers 3-epi-25(OH)D-3 and 3-epi-25(OH)D-2. The method has a run time of 5 min and was validated according to the US Food and Drug Administration and the European Medicines Agency guidelines. High mass resolution was advantageously applied to separate a quasi-isobaric interference of the internal standard D 6 25(OH)D-2 with 3-epi-25(OH)D-3. All analytes showed an imprecision of below 10% coefficient of variation (CV), trueness between 90% and 110%, and limits of quantification below 10 nM. Concentrations measured by LC-MS/HR-MS are in good agreement with those of the National Institute of Standards and Technology reference methods using LC-MS/MS (QQQ). In conclusion, quantification of 25(OH) D by LCMS/HR-MS is applicable for routine testing and also holds promise for highly specific quantifi cation of other small molecules.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | VITAMIN-D METABOLITES; 25-HYDROXYVITAMIN D-3; HUMAN SERUM; 3-EPI-25-HYDROXYVITAMIN D-3; ASSAYS; OVERESTIMATION; LIMITATIONS; ADULTS; Orbitrap; cholecalciferol; ergocalciferol; epimers; laboratory medicine; routine testing; clinical chemistry |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Klinische Chemie und Laboratoriumsmedizin |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Jul 2019 07:51 |
| Last Modified: | 15 Jul 2019 07:51 |
| URI: | https://pred.uni-regensburg.de/id/eprint/5427 |
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