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. 2019 Mar 26;9:5188. doi: 10.1038/s41598-019-41735-8

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© The Author(s) 2019

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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PCA loading plots. PC 1 (a) separates data according to CH/CH₂ stretching intensity (derived from carbohydrates and lipophilic extractives), while PC 2 (b) separates the data according to aromatic contributions (pinosylvins and lignin) and CH/CH₂ stretching intensity (carbohydrates and lipophilic extractives). PC3 (c) separates the data according to contributions from lipophilic extractives and cell wall polymers (cellulose and lignin).