Official Journal of the Japan Wood Research Society
Table 2 Assignment of polysaccharide and lignin signals in 1H–13C correlation (HSQC) spectra of pine and Shorea diet cell wall samples
From: Structural basis of lignocellulose deconstruction by the wood-feeding anobiid beetle Nicobium hirtum
Labels | δC/δH (ppm) | Assignment |
|---|---|---|
Cell wall polysaccharide signals | ||
Gl1 | 103.3/4.40 | C1–H1 in (1➝4)-β-d-glucopyranosyl units |
M1 | 100.6/4.65 | C1–H1 in (1➝4)-β-d-mannopyranosyl units |
M′1 | 99.0/4.87 | C1–H1 in 2-O-acetyl-β-d-mannopyranosyl units |
M′′1 | 100.6/4.65 | C1–H1 in 3-O-acetyl-β-d-mannopyranosyl units |
X1 | 102.0/4.34 | C1–H1 in (1➝4)-β-d-xylopyranosyl units |
X′1 | 99.7/4.59 | C1–H1 in 2-O-acetyl-β-d-xylopyranosyl units |
X″1 | 102.0/4.34 | C1–H1 in 3-O-acetyl-β-d-xylopyranosyl units |
X″1 | 75.1/4.95 | C1–H1 in 2-O-acetyl-β-d-xylopyranosyl units |
X′″1 | 98.3/4.96 | C1–H1 in 2,3-di-O-acetyl-β-d-xylopyranosyl units |
A1 | 108.2/4.90 | C1–H1 in α-l-arabinofuranosyl units |
U1 | 97.7/5.27 | C1–H1 in α-d-glucuronopyranosyl units |
Lignin signals | ||
G2 | 111.2/7.07 | C2–H2 in guaiacyl units |
G5,6 | 115.3/6.95,119.1/6.87 | C5–H5 and C6–H6 in guaiacyl units |
S2/6 | 104.3/6.77 | C2–H2 and C6–H6 in syringyl units |
G′2 | 111.7/7.42 | C2–H2 in oxidized guaiacyl units |
S′2/6 | 106.8/7.23 | C2–H2 and C6–H6 in oxidized syringyl units |
Iα | 71.6/4.87 | Cα–Hα in β–O–4 substructures |
Iβ | 84.2/4.36, 86.3/4.18 | Cβ–Hβ in β–O–4 units |
Iγ | 60.6/3.72 | Cγ–Hγ in β–O–4 units |
IIα | 87.3/5.53 | Cα–Hα in β–5 units |
IIβ | 53.6/3.48 | Cβ–Hβ in β–5 units |
IIγ | 63.1/3.74 | Cγ–Hγ in β–5 units |
IIIα | 85.1/4.65 | Cα–Hα in β–β units |
IIIβ | 53.9/3.02 | Cβ–Hβ in β–β units |
IV′γ | 193.9/9.61 | Cγ–Hγ in cinnamaldehyde end-units |
IV′′α | 190.9/9.80 | Cα–Hα in benzaldehyde end-units |
IV′′′β | 41.2/3.11 | Cβ–Hβ in HPV/HPS end-units |
IV′′′γ | 57.2/3.81 | Cγ–Hγ in HPV/HPS end-units |
OMe | 3.72/55.8 | Methyl C–H in aromatic methoxyl groups |
Others | ||
– | 100.4/5.20, 102.1/5.01, 103.3/4.62 | C1–H1 in starch glucans |
– | 126.2/7.12, 128.1/7.20, 129.1/7.27, 130.1/7.05 | Aromatic C–H in aromatic protein residues |