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. 2017 May 23;7:2257. doi: 10.1038/s41598-017-02499-1

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Metabolic profiling-based evaluation of GTE quality using MALDI–MS system with matrix screening. (A) Heatmap analysis showing the different ionization rates of the 72 phytochemicals by the 4 matrices, with the chemical structures of the matrices shown on the right. (B) Mass spectra for GTE–matrix mixtures (upper panels) or isolated matrices (lower panels) (peak heights represent the relative signal intensities, where the intensity of the strongest peak is 100%). The total number of peaks detected by each matrix is shown. (C) PCA score plot showing different clusters of MS profiles, based on the attributes of picking seasons and cultivars.