Rapid Quantification of 25-Hydroxyvitamin D3 in Human Serum by Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry

  • Yulin Qi
  • Miriam Müller
  • Caroline S. Stokes
  • Dietrich A. Volmer
Research Article

Abstract

LC-MS/MS is widely utilized today for quantification of vitamin D in biological fluids. Mass spectrometric assays for vitamin D require very careful method optimization for precise and interference-free, accurate analyses however. Here, we explore chemical derivatization and matrix-assisted laser desorption/ionization (MALDI) as a rapid alternative for quantitative measurement of 25-hydroxyvitamin D3 in human serum, and compare it to results from LC-MS/MS. The method implemented an automated imaging step of each MALDI spot, to locate areas of high intensity, avoid sweet spot phenomena, and thus improve precision. There was no statistically significant difference in vitamin D quantification between the MALDI-MS/MS and LC-MS/MS: mean ± standard deviation for MALDI-MS—29.4 ± 10.3 ng/mL—versus LC-MS/MS—30.3 ± 11.2 ng/mL (P = 0.128)—for the sum of the 25-hydroxyvitamin D epimers. The MALDI-based assay avoided time-consuming chromatographic separation steps and was thus much faster than the LC-MS/MS assay. It also consumed less sample, required no organic solvents, and was readily automated. In this proof-of-concept study, MALDI-MS readily demonstrated its potential for mass spectrometric quantification of vitamin D compounds in biological fluids.

Graphical Abstract

Keywords

Vitamin D Matrix-assisted laser desorption/ionization Signal-to-noise ratio Mass spectrometry Serum 

Notes

Compliance with Ethical Standards

All patients provided written informed consent and the study was approved by the local research ethics committee (Ärztekammer des Saarlandes, ref. 57/11).

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Copyright information

© American Society for Mass Spectrometry 2018

Authors and Affiliations

  • Yulin Qi
    • 1
  • Miriam Müller
    • 2
  • Caroline S. Stokes
    • 3
  • Dietrich A. Volmer
    • 1
  1. 1.Department of ChemistryHumboldt University of BerlinBerlinGermany
  2. 2.Saarland UniversitySaarbrückenGermany
  3. 3.Department of Medicine IISaarland University Medical CenterHomburgGermany

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