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. 2018 Jan 15;239:760–770. doi: 10.1016/j.foodchem.2017.06.161

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© 2017 The Author(s)

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Fig. 1 — (a–c) PCA score plots of the first principal component (t1) versus the second principal component (t2) from the combined fraction’s (methanol/water and chloroform) mass spectra of the entire set of carrots under the (a) Electrospray ionization (ESI)+ mode. Quality control (QC) clusters (filled triangles) are highlighted within the ellipses. (b) ESI− mode and (c) ESI− with acid in the mobile phase. Organic samples (filled circles), conventional samples (filled squares). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)