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. 2020 Jun 23;25(12):2893. doi: 10.3390/molecules25122893

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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FT-IR spectra of soda (a,b,c,d) and kraft (e,f,g,h) lignin fractions recovered from the aqueous process (a,b,e,f) and the organic process (c,d,g,h). Different regions of the infrared spectrum are reported for clarity.