Details of multiple extractions. (A) Workflow displaying the different metabonomic techniques selected to analyze the aqueous and lipid fraction of breast milk extractions. Reprinted with permission from Andreas, N.J., Hyde, M.J., Gomez-Romero, M., Lopez-Gonzalvez, M.A., Villaseñor, A., Wijeyesekera, A., Barbas, C., Modi, N., Holmes, E. and Garcia-Perez, I. (2015), Multiplatform characterization of dynamic changes in breast milk during lactation. ELECTROPHORESIS, 36: 2269–2285. Copyright 2015 Wiley-VCH GmbH, Weinheim. (B) Survey of 43 multiplatform untargeted metabolomics papers. A bar graph summarizing the number and type of solvents or methods used to extract metabolites from a biological sample.