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. 2017 Oct 10;13:81. doi: 10.1186/s13007-017-0235-x

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© The Author(s) 2017

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. 1 — Box plot comparison of total phenolic acids in maize seeds. a Total free phenolic acids. b Total bound phenolic acids. c Coefficient of variation of total free phenolic acid quantification; d coefficient of variation of total bound phenolic acids. Horizontal line represents the median of total values. Vertical line represents the maximum and minimum value. Box covers the 75 and 25 percentiles. [⁺Results are expressed as mg of gallic acid equivalent per 100 g of dry weight (mg GAE/100 g dw). Significant differences between the methods were established by ANOVA (α = 0.05), ns no significance, * p < 0.05; ** p < 0.001; *** p < 0.001]