Abstract
Metabonomics has become a very valuable tool and many research fields rely on results coming out from this combination of analytical techniques, chemometric strategies, and biological interpretation. Moreover, the matrices are more and more complex and the implications of the results are often of major importance. In this context, the need for pertinent validation strategies comes naturally. The choice of the appropriate chemometric method remains nevertheless a difficult task due to particularities such as: the number of measured variables, the complexity of the matrix and the purposes of the study. Consequently, this paper presents a detailed metabonomic study on human urine with a special emphasis on the importance of assessing the data's quality. It also describes, step by step, the statistical tools currently used and offers a critical view on some of their limits. In this work, 29 urine samples among which 15 samples obtained from tetrahydrocannabinol (delta-9-tetrahydrocannabinol)-consuming athletes, 5 samples provided by volunteers, and 9 samples obtained from athletes were submitted to untargeted analysis by means of ultra high-pressure liquid chromatography–electrospray ionization–time-of-flight mass spectrometry. Next, the quality of the obtained data was assessed and the results were compared to those found in databases. Then, unsupervised (principal component analysis (PCA)) and supervised (ANOVA/PCA, partial least-square–discriminant analysis (PLS-DA), orthogonal PLS-DA) univariate and multivariate statistical methods were applied.
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Abbreviations
- ANOVA:
-
Analysis of variance
- CE-MS:
-
Capillary electrophoresis-mass spectrometry
- CV:
-
Coefficient of variation
- GC-MS:
-
Gaseous chromatography–mass spectrometry
- LC-MS:
-
Liquid chromatography–mass spectrometry
- LC-ToF:
-
Liquid chromatography–time-of-flight mass spectrometry
- NMR:
-
Nuclear magnetic resonance
- OPLS:
-
Orthogonal partial least-square analysis
- PCA:
-
Principal component analysis
- PLS-DA:
-
Partial least-square–discriminant analysis
- QC:
-
Quality control
- THC:
-
Tetrahydrocannabinol delta-9-tetrahydrocannabinol; (6aR,10aR)-6,6,9-trimethyl-3-pentyl-6a,7,8,10a-tetrahydrobenzo[c]chromen-1-ol
- UHPLC-ESI/ToF:
-
Ultra high-pressure liquid chromatography–electrospray ionization–time-of-flight mass spectrometry
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Acknowledgments
The authors would like to acknowledge the contribution of the Rhone-Alpes Regional Council and the French anti-Doping Agency for the samples necessary to this work. We would also like to thank Aurélie Fildier for her technical help for the high resolution mass spectrometry.
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Published in the special issue Analytical Science in France with guest editors Christian Rolando and Philippe Garrigues.
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Kiss, A., Bordes, C., Buisson, C. et al. Data-handling strategies for metabonomic studies: example of the UHPLC-ESI/ToF urinary signature of tetrahydrocannabinol in humans. Anal Bioanal Chem 406, 1209–1219 (2014). https://doi.org/10.1007/s00216-013-7199-0
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DOI: https://doi.org/10.1007/s00216-013-7199-0