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. 2016 Sep 1;16(1):190. doi: 10.1186/s12870-016-0880-7

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© The Author(s). 2016

Open AccessThis 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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Epimerization of epicatechin to catechin. Analysis of the conversion of procyanidin B2 and epicatechin after different treatments by LC-ESI-MS-QTRAP(MRM). The above indicated substances were spiked on ten tt4-11 seeds prior to extraction (extracted samples) or prior to hydrolysis (non-extracted samples). Shown are MRMs for the substances indicated below the chromatograms