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Official Journal of the Japan Wood Research Society

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, CH3–COO–

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