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  • Chen H, McCoy LF, Schleicher RL, Pfeiffer CM. Measurement of 25-hydroxyvitamin D3 (25OHD3) and 25-hydroxyvitamin D2 (25OHD2) in human serum using liquid chromatography-tandem mass spectrometry and its comparison to a radioimmunoassay method. Clin Chim Acta. 2008;391:6-12. Full Text
  • Erhardt JG, Estes JE, Pfeiffer CM, Biesalski HK, Craft NE. Combined measurement of ferritin, soluble transferrin receptor, retinol binding protein, and C-reactive protein by an inexpensive, sensitive, and simple sandwich enzyme-linked immunosorbent assay technique. J Nutr. 2004 Nov;134(11):3127-32. Full Text
  • Fazili Z, Pfeiffer CM. Measurement of folates in serum and conventionally prepared whole blood lysates: application of an automated 96-well plate isotope-dilution tandem MS method. Clin Chem. 2004;50:2378-81. Full Text
  • Fazili Z, Pfeiffer CM, Zhang M, Jain R. Erythrocyte folate extraction and quantitative determination by liquid chromatography-tandem mass spectrometry: comparison of results with microbiologic assay. Clin Chem. 2005 Dec;51(12):2318-25. Full Text
  • McCoy LF, Bowen MB, Xu M, Chen H, Schleicher RL. Improved HPLC assay for measuring serum vitamin C with 1-methyluric acid used as an electrochemically active internal standard. Clin Chem. 2005 Jun;51(6):1062-4. Full Text
  • McCoy LF, Scholl PF, Schleicher RL, Groopman JD, Powers CD, Pfeiffer CM. Analysis of aflatoxin B1-lysine adduct in serum using isotope-dilution liquid chromatography/tandem mass spectrometry. Rapid Commun Mass Spectrom. 2005;19(16):2203-10. Full Text
  • Nelson BC, Pfeiffer CM, Margolis SA, Nelson CP. Affinity extraction combined with stable isotope dilution LC/MS for the determination of 5-methyltetrahydrofolate in human plasma. Anal Biochem. 2003 Feb 1;313(1):117-27. Full Text
  • Nelson BC, Pfeiffer CM, Margolis SA, Nelson CP. Solid-phase extraction-electrospray ionization mass spectrometry for the quantification of folate in human plasma or serum. Anal Biochem. 2004 Feb 1;325(1):41-51. Full Text
  • Nelson BC, Pfeiffer CM, Sniegoski LT, Satterfield MB. Development and evaluation of an isotope dilution LC/MS method for the determination of total homocysteine in human plasma. Anal Chem. 2003 Feb 15;75(4):775-84. Full Text
  • Pawlosky RJ, Flanagan VP, Pfeiffer CM. Determination of 5-methyltetrahydrofolic acid in human serum by stable-isotope dilution high-performance liquid chromatography-mass spectrometry. Anal Biochem. 2001 Nov 15;298(2):299-305. Full Text
  • Pfeiffer CM, Fazili Z, McCoy LF, Gunter EW. Determination of folate vitamers in human serum by stable-isotope dilution tandem mass spectrometry and comparison to radioassay and microbiologic assay. Clin Chem. 2004;50(2):423-32. Full Text
  • Pfeiffer CM, Fazili Z, Zhang M. Folate analytical methodology. In: Bailey LB, editor. Folate in Health and Disease. 2nd ed. CRC Press. Taylor & Francis Group. 2010.
  • Pfeiffer CM, Huff DL, Gunter EW. Rapid and accurate HPLC assay for plasma total homocysteine and cysteine in a clinical laboratory setting. Clin Chem. 1999 Feb;45(2):290-2. Full Text
  • Pfeiffer CM, Twite D, Shih J, Holets-McCormack SR, Gunter EW. Method comparison for total plasma homocysteine between the Abbott IMx analyzer and an HPLC assay with internal standardization. Clin Chem. 1999 Jan;45(1):152-3. Full Text
  • Rybak ME, Parker DL, Pfeiffer CM. Determination of urinary phytoestrogens by HPLC-MS/MS: a comparison of atmospheric pressure chemical ionization (APCI) and electrospray ionization (ESI). J Chromat B 2008;861:145-50. Full Text
  • Rybak ME, Pfeiffer CM. Clinical analysis of vitamin B6: Determination of pyridoxal 5'-phosphate and 4-pyridoxic acid in human serum by reversed-phase high-performance liquid chromatography with chlorite postcolumn derivatization. Anal Biochem. 2004;333:336-44. Full Text
  • Rybak ME, Pfeiffer CM. A simplified protein precipitation and filtration procedure for determining serum vitamin B(6) by high-performance liquid chromatography. Anal Biochem 2009 May 1;388(1):175-7. Full Text
  • Satterfield MB, Sniegoski LT, Welch MJ, Nelson BC, Pfeiffer CM. Comparison of isotope dilution mass spectrometry methods for the determination of total homocysteine in plasma and serum. Anal Chem. 2003 Sep 1;75(17):4631-8. Full Text

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