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. 2022 Jan 7;14(1):2015166. doi: 10.1080/20002297.2021.2015166

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© 2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — PCA, PLS-DA plots, and differentially abundant ions identified in ESI+ and ESI- modes for treatment and control group samples. (a-b) PCA plots for ESI+ and ESI- modes; (c-d) PLS-DA plots for ESI+ and ESI- modes; (e-f) Validation plots were obtained from 200 permutation tests in (c) ESI+ (R² = 0.993 and Q² = 0.970) and (d) ESI- (R² = 0.997 and Q² = 0.976) modes; (g) Differentially abundant ions identified in the ESI+ mode; (h) Differentially abundant ions identified in the ESI- mode.