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Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image

Table 5 Resonance assignment of 13C NMR spectrum of raw wood

From: The surface chemical constituent analysis of poplar fibrosis veneers during heat treatment

Resonance number Chemical shift (ppm) Assignments
1 172 Hemicelluloses: –COO–R, CH3COO–
2 152.6 Lignins: S-3(e), S-5(e)
3 148–147 Lignins: S-3(ne), S-5(ne), G-3(ne,e), G-4(ne,e)
4 138.5–138 Lignins: S-1(e), S-4(e), G-1(e)
5 134–133 Lignins: S-1(ne), S-4(ne), G-1(ne)
6 121 Lignin: G-6
7 114–106 Lignins: S-2, S-6, G-5, G-6
8 104.8 Cellulose: C-1
8′ 104–101 Hemicellulose: C-1
9 88.7 Carbohydrates: C-4 cellulose (ordered)
10 83.8 Lignins: Cβ, Carbohydrates: C-4 cellulose (disordered)
11 74.8 Lignin: Cα, Carbohydrates: C-2, -3, -5
12 72.2 Carbohydrates: C-2, -3, -5
13 64.7 Carbohydrates: C-6 cellulose (ordered)
14 61.6 Lignins: Cγ, Carbohydrates: C-6 cellulose (disordered)
15 55.7 Lignin: OCH3
16 21 Hemicellulose: CH3–COO–
  1. NMR nuclear magnetic resonance, S carbon in syringyls (aromatic unit with two methoxyl groups), G carbon in guaiacyls (aromatic unit with only one methoxyl), ne in non-etherified arylglycerol β-aryl ethers, e in etherified arylglycerol β-aryl ethers