Validation of a two-step quality control approach for a large-scale human urine metabolomic study conducted in seven experimental batches with LC/QTOF-MS
Abstract
After his study of food science at the Rheinische Friedrich-Wilhelms University of Bonn, Tobias J Demetrowitsch obtained his doctoral degree in the research field of metabolomics at the Christian-Albrechts-University of Kiel. The present paper is part of his doctoral thesis and describes an extended strategy to evaluate and verify complex or large-scale experiments and data sets.
Large-scale studies result in high sample numbers, requiring the analysis of samples in different batches. So far, the verification of such LC–MS-based metabolomics studies is difficult. Common approaches have not provided a reliable validation procedure to date. This article shows a novel verification process for a large-scale human urine study (analyzed by a LC/QToF-MS system) using a two-step validation procedure. The first step comprises a targeted approach that aims to examine and exclude statistical outliers. The second step consists of a principle component analysis, with the aim of a tight cluster of all quality controls and a second for all volunteer samples. The applied study design provides a reliable two-step validation procedure for large-scale studies and additionally contains an inhouse verification procedure.
References
- 1 Comparative urine analysis by liquid chromatography−mass spectrometry and multivariate statistics: method development, evaluation, and application to proteinuria. J. Proteome Res. 6(1), 194–206 (2007).
- 2 HILIC-UPLC–MS for exploratory urinary metabolic profiling in toxicological studies. Anal. Chem. 83(1), 382–390 (2011).
- 3 . A QC approach to the determination of day-to-day reproducibility and robustness of LC–MS methods for global metabolite profiling in metabonomics/metabolomics. Bioanalysis 4(18), 2239–2247 (2012).
- 4 . Within-day reproducibility of an HPLC–MS-based method for metabonomic analysis: application to human urine. J. Proteome Res. 6(8), 3291–3303 (2007).
- 5 . Evaluation of the repeatability of ultra-performance liquid chromatography–TOF-MS for global metabolic profiling of human urine samples. J. Chromatogr. B Analyt. Technol. Biomed. Life Sci. 871(2), 299–305 (2008).
- 6 Development of a robust and repeatable UPLC−MS method for the long-term metabolomic study of human serum. Anal. Chem. 81(4), 1357–1364 (2009).
- 7 . The importance of experimental design and QC samples in large-scale and MS-driven untargeted metabolomic studies of humans. Bioanalysis 4(18), 2249–2264 (2012).
- 8 Scope and limitations of principal component analysis of high resolution LC-TOF-MS data: the analysis of the chlorogenic acid fraction in green coffee beans as a case study. Anal. Methods 3(1), 144–155 (2011).
- 9 Normalization strategies for metabonomic analysis of urine samples. J. Chromatogr. B Analyt. Technol. Biomed. Life Sci. 877(5–6??), 547–552 (2009).
- 10 Committee for Medicinal Products for Human Use. Guideline on Bioanalytical Method Validation (2011). www.ema.europa.eu/docs/en_GB/document_library/Scientific_guideline/2011/08/WC500109686.pdf.
- 11 US Department of Health and Human Services FDA. Guidance for Industry: Bioanalytical Method Validation (2013). www.fda.gov/downloads/Drugs/GuidanceComplianceRegulatoryInformation/Guidances/UCM368107.pdf.
- 12 . Determination of ascorbic acid in plasma and urine by high performance liquid chromatography with ultraviolet detection. Clin. Chem. Lab. Med. 37(5), 533–536 (1999).
- 13 . Urinary ascorbic acid excretion in the human as affected by dietary fiber and zinc. Am. J. Clin. Nutr. 31(7), 1167–1171 (1978).
- 14 . A pragmatic and readily implemented quality control strategy for HPLC–MS and GC-MS-based metabonomic analysis. Analyst 131(10), 1075–1078 (2006).
- 15 . Investigation of analytical variation in metabonomic analysis using liquid chromatography/mass spectrometry. Rapid Commun. Mass Spectrom. 21(18), 2965–2970 (2007).
- 16 .LC–MS/MS systematic toxicological analysis: comparison of MS/MS spectra obtained with different instruments and settings. Clin. Biochem. 38(4), 362–372 (2005).
- 17 . Outliers in Outliers in Statistical Data (3rd Edition). Wiley, NY, USA (1994).
- 18 HMDB: the Human Metabolome Database. Nucleic Acids Res. 35, D521–D526 (2007).
- 19 HMDB: a knowledgebase for the human metabolome. Nucleic Acids Res. 37, D603–D610 (2009).
- 20 HMDB 3.0 – The Human Metabolome Database in 2013. Nucleic Acids Res. 41(D1), D801–D807 (2012).
- 21 . Effects of low-level analysis of the results of gene expression data from Affymetrix. Medical Faculty of the University of Duisburg-Essen. 1–90 (2007).
- 22 . A comparison of normalization methods for high density oligonucleotide array data based on variance and bias. Bioinformatics 19(2), 185–193 (2003).
- 23 . Dimensionality reduction and visualization in principal component analysis. Anal. Chem. 80(13), 4933–4944 (2008).
- 24 . Metabonomics and biomarker discovery: LC–MS metabolic profiling and constant neutral loss scanning combined with multivariate data analysis for mercapturic acid analysis. Anal. Chem. 78(4), 1296–1305 (2006).
- 25 Non-targeted metabolomic approach reveals urinary metabolites linked to steroid biosynthesis pathway after ingestion of citrus juice. Food Chem. 136(2), 938–946 (2013).
- 26 . Doping control using high and ultra-high resolution mass spectrometry based non-targeted metabolomics-a case study of salbutamol and budesonide abuse. PLoS ONE 8(9), e74584 (2013).