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. 2019 Mar 11;411(12):2555–2567. doi: 10.1007/s00216-019-01696-3

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© The Author(s) 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Analytes exclusively (indicated by asterisk) or especially amenable to enrichment by VEC (gray shade, only compounds of polar space shown) or SPE (polar space and nonpolar analytes) from all tested matrices. Molecular structures were created by MarvinSketch (version 18.8.0, ChemAxon) as part of the Jchem for Excel plugin (version 18.8.0.253, ChemAxon)