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Analytical and Bioanalytical Chemistry

, Volume 407, Issue 11, pp 2955–2964 | Cite as

An LC-MS/MS method for serum methylmalonic acid suitable for monitoring vitamin B12 status in population surveys

  • Ekaterina M. Mineva
  • Mindy Zhang
  • Daniel J. Rabinowitz
  • Karen W. Phinney
  • Christine M. PfeifferEmail author
Paper in Forefront
Part of the following topical collections:
  1. Reference Materials for Chemical Analysis

Abstract

Methylmalonic acid (MMA), a functional indicator of vitamin B12 insufficiency, was measured in the US population in the National Health and Nutrition Examination Survey (NHANES) from 1999 to 2004 using a GC/MS procedure that required 275 μL of sample and had a low throughput (36 samples/run). Our objective was to introduce a more efficient yet highly accurate LC-MS/MS method for NHANES 2011–2014. We adapted the sample preparation with some modifications from a published isotope-dilution LC-MS/MS procedure. The procedure utilized liquid–liquid extraction and generation of MMA dibutyl ester. Reversed-phase chromatography with isocratic elution allowed baseline resolution of MMA from its naturally occurring structural isomer succinic acid within 4.5 min. Our new method afforded an increased throughput (≤160 samples/run) and measured serum MMA with high sensitivity (LOD = 22.1 nmol/L) in only 75 μL of sample. Mean (±SD) recovery of MMA spiked into serum (2 d, 4 levels, 2 replicates each) was 94 % ± 5.5 %. Total imprecision (41 d, 2 replicates each) for three serum quality control pools was 4.9 %–7.9 % (97.1–548 nmol/L). The LC-MS/MS method showed excellent correlation (n = 326, r = 0.99) and no bias (Deming regression, Bland-Altman analysis) compared to the previous GC/MS method. Both methods produced virtually identical mean (±SD) MMA concentrations [LC-MS/MS: 18.47 ± 0.71 ng/mL (n = 17), GC/MS: 18.18 ± 0.67 ng/mL (n = 11)] on a future plasma reference material compared with a GC/MS method procedure from the National Institute of Standards and Technology [18.41 ± 0.70 ng/mL (n = 15)]. No adjustment will be necessary to compare previous (1999–2004) to future (2011–2014) NHANES MMA data.

Graphical Abstract

Keywords

MMA Method comparison GC/MS Anticoagulant types NHANES NIST SRM 1950 Vitamin B12 

Notes

Acknowledgments

The Division of Laboratory Sciences at the National Centers for Environmental Health contributed to this project. The authors thank Michael Welch and Lorna Sniegoski, from NIST, for their involvement in MMA measurements in SRM 1950. They thank Hui Ping Chen and Bridgette Toombs, members of Nutritional Biomarkers group at the CDC, for their contribution in sample supply for stability and collection tube studies.

Supplementary material

216_2014_8148_MOESM1_ESM.pdf (339 kb)
ESM 1 (PDF 338 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg (outside the USA) 2014

Authors and Affiliations

  • Ekaterina M. Mineva
    • 1
  • Mindy Zhang
    • 1
  • Daniel J. Rabinowitz
    • 1
  • Karen W. Phinney
    • 2
  • Christine M. Pfeiffer
    • 1
    Email author
  1. 1.Division of Laboratory Sciences, National Center for Environmental HealthCenters for Disease Control and PreventionAtlantaUSA
  2. 2.Biomolecular Measurement DivisionNational Institute of Standards and TechnologyGaithersburgUSA

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