Data processing for 1D NMR spectra is a key bottleneck for metabolomic and other complex-mixture studies, particularly where quantitative data on individual metabolites are required. We present a protocol for automated metabolite deconvolution and quantification from complex NMR spectra by using the Bayesian automated metabolite analyzer for NMR (BATMAN) R package. BATMAN models resonances on the basis of a user-controllable set of templates, each of which specifies the chemical shifts, J-couplings and relative peak intensities for a single metabolite. Peaks are allowed to shift position slightly between spectra, and peak widths are allowed to vary by user-specified amounts. NMR signals not captured by the templates are modeled non-parametrically by using wavelets. The protocol covers setting up user template libraries, optimizing algorithmic input parameters, improving prior information on peak positions, quality control and evaluation of outputs. The outputs include relative concentration estimates for named metabolites together with associated Bayesian uncertainty estimates, as well as the fit of the remainder of the spectrum using wavelets. Graphical diagnostics allow the user to examine the quality of the fit for multiple spectra simultaneously. This approach offers a workflow to analyze large numbers of spectra and is expected to be useful in a wide range of metabolomics studies.
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T.M.D.E., M.D.I., W.A. and J.H. acknowledge support from the Biotechnology and Biological Sciences Research Council (BBSRC), UK, grant BB/E20372/1. J.G.B., T.M.D.E., J.H. and M.L. acknowledge support from the Natural Environment Research Council (NERC), UK, grant NE/H009973/1. T.M.D.E. and J.H. acknowledge support from the European Commission COSMOS project, contract EC312941. We thank the eMICE consortium for use of the synthetic mixture spectra.
The authors declare no competing financial interests.
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Hao, J., Liebeke, M., Astle, W. et al. Bayesian deconvolution and quantification of metabolites in complex 1D NMR spectra using BATMAN. Nat Protoc 9, 1416–1427 (2014). https://doi.org/10.1038/nprot.2014.090
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