Antonius M. Beijers

Measurement of 25-OH-vitamin D in human serum using liquid chromatography tandem-mass spectrometry with comparison to radioimmunoassay and automated immunoassay

Johannes M.W. van den Ouweland, Antonius M. Beijers, Pierre N.M. Demacker et al. · Journal of Chromatography B · 2010 · 149 citations

Medicine, Biochemistry, Endocrinology +16

Overestimation of 25-hydroxyvitamin D3 by increased ionisation efficiency of 3-epi-25-hydroxyvitamin D3 in LC–MS/MS methods not separating both metabolites as determined by an LC–MS/MS method for separate quantification of 25-hydroxyvitamin D3, 3-epi-25-hydroxyvitamin D3 and 25-hydroxyvitamin D2 in human serum

Johannes M.W. van den Ouweland, Antonius M. Beijers, Henny van Daal · Journal of Chromatography B · 2014 · 79 citations

Life Sciences, Biochemistry, Mass Spectrometric Analysis +11

Plasma citrulline measurement using UPLC tandem mass-spectrometry to determine small intestinal enterocyte pathology

Pierre N.M. Demacker, Antonius M. Beijers, Henny van Daal et al. · Journal of Chromatography B · 2008 · 68 citations

Medicine, Biochemistry, Pathobiology +12

Time-course analysis of 3-epi-25-hydroxyvitamin D3 shows markedly elevated levels in early life, particularly from vitamin D supplementation in preterm infants

Nina Ooms, Henny van Daal, Antonius M. Beijers et al. · Pediatric Research · 2015 · 40 citations

Medicine, Human Development, Pediatrics +16

Evaluation of 3-epi-25-hydroxyvitamin D₃ cross-reactivity in the Roche Elecsys Vitamin D Total protein binding assay

Johannes M.W. van den Ouweland, Antonius M. Beijers, Henny van Daal et al. · Clinical Chemistry and Laboratory Medicine (CCLM) · 2013 · 26 citations

Life Sciences, Biochemistry, Nutritional Sciences +17