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. 2018 Jun 5;10(6):619. doi: 10.3390/polym10060619

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© 2018 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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HSQC Spectra showing side chain and aromatic/unsaturated regions for TC_extr and TC lignin isolates (MWL, ILL and MWL), assignment in Table S2 (Supplementary Materials). Key: Symbols for acetylated units are in green highlight; β-O-4 alkyl-aryl ethers, including C_γ-H_γ in γ-acetylated β-O-4′ substructures (A); Resinols (B); Phenylcoumarans (C); Spirodienone (D); Cinnamyl alcohol end groups, include C_γ-H_γ in cinnamyl acetate end groups (J); p-coumaric and ferulic acids (P&F); β-d-Mannosyl (mannose residues) (β-D_m); α-d-Galactosyl (galactose residues) (α-D_ga); β-d-Glucosyl (Glucose residues) (β-D); C2−H2 in 2-O-acetyl-β-d-xylopyranoside (X2); C3−H3 in β-d-xylopyranoside (X3); C4−H4 in β-d-xylopyranoside (X4); Unknown (U).

HSQC Spectra showing side chain and aromatic/unsaturated regions for TC_extr and TC lignin isolates (MWL, ILL and MWL), assignment in Table S2 (Supplementary Materials). Key: Symbols for acetylated units are in green highlight; β-O-4 alkyl-aryl ethers, including C_γ-H_γ in γ-acetylated β-O-4′ substructures (A); Resinols (B); Phenylcoumarans (C); Spirodienone (D); Cinnamyl alcohol end groups, include C_γ-H_γ in cinnamyl acetate end groups (J); p-coumaric and ferulic acids (P&F); β-d-Mannosyl (mannose residues) (β-D_m); α-d-Galactosyl (galactose residues) (α-D_ga); β-d-Glucosyl (Glucose residues) (β-D); C2−H2 in 2-O-acetyl-β-d-xylopyranoside (X2); C3−H3 in β-d-xylopyranoside (X3); C4−H4 in β-d-xylopyranoside (X4); Unknown (U).