Abstract |
Vanillylmandelic acid (VMA), as one of the most important catecholamine metabolites, is commonly used to aid in diagnosis of pheochromocytoma. This study develops a rapid and simple high-throughput LC-MS/MS method for the measurement of urinary VMA. Without sample pretreatment, the urine specimens were mixed with internal standard (IS) solution for direct analysis by LC-MS/MS in two minutes. VMA and VMA-d3 were detected in the multiple-reaction monitoring mode using the specific transitions m/z 197.0→137.0 and 200.0→140.0, respectively. This method was validated for consistent linearity from 1.0 to 250.0μM with CVs≤3.12%, excellent recovery, good stability and low carryover. The lowest limit of quantification (LLOQ) was 0.125μmol/L for VMA with CV of 14.1%, and the lower limit of detection (LOD) was 0.025μmol/L. Intra-assay and inter-assay imprecision values (CVs) for VMA were all below 2.11%. Dilution linearity was investigated with a satisfied mean accordance of 105%. Method comparison of LC-MS/MS and microcolumn chromatography in our lab was performed and the reference interval was established in agreement with that of the Mayo Clinic. All these results demonstrate that this validated LC-MS/MS approach shows improved accuracy and reproducibility compared with microcolumn chromatography. The low sample volume, simplicity, rapidity, and robustness of the method make it suitable for use as a high-throughput assay in routine clinical biochemistry laboratories.
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Authors | Ying Shen, Jie Lu, Qing Tang, Qing Guan, Ziyong Sun, Huijun Li, Liming Cheng |
Journal | Journal of chromatography. B, Analytical technologies in the biomedical and life sciences
(J Chromatogr B Analyt Technol Biomed Life Sci)
Vol. 1002
Pg. 92-7
(Oct 01 2015)
ISSN: 1873-376X [Electronic] Netherlands |
PMID | 26319301
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | Copyright © 2015 Elsevier B.V. All rights reserved. |
Chemical References |
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Topics |
- Adrenal Gland Neoplasms
(diagnosis)
- Chromatography, Liquid
(methods)
- Humans
- Limit of Detection
- Pheochromocytoma
(diagnosis)
- Reproducibility of Results
- Tandem Mass Spectrometry
(methods)
- Vanilmandelic Acid
(urine)
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