Table 3.
Assignment of the polysaccharide signals in the 2D HSQC NMR spectra of LCCs.
| Label | δC/δH (ppm) | Assignment |
|---|---|---|
| Est | 65-62/4.5-4.0 | C-H in γ-ester linkages |
| X5 | 62.6/3.40 | C5-H5 in β-d-xylopyranoside |
| M22 | 70.3/5.27 | C2-H2 in 2-O-acetyl-β-d-mannopyranoside |
| X2 | 72.6/3.05 | C2-H2 in β-d-xylopyranoside |
| X22 | 72.8/4.43 | C2-H2 in 2-O-acetyl-β-d-xylopyranoside |
| M33 | 73.6/4.93 | C3-H3 in 3-O-acetyl-β-d-mannopyranoside |
| X3 | 73.8/3.25 | C3-H3 in β-d-xylopyranoside |
| X33 | 73.9/4.61 | C3-H3 in 3-O-acetyl-β-d-xylopyranoside |
| X4 | 75.4/3.53 | C4-H4 in β-d-xylopyranoside |
| U4 | 81.1/3.10 | C4-H4 in 4-O-methyl-α-d-glucuronic acid |
| BE2 | 81.4/5.04 | Cα-Hα in benzyl ether (primary OH) linkages |
| BE1 | 81.6/4.64 | Cα-Hα in benzyl ether (secondary OH) linkages |
| αX1(R) | 91.9/4.89 | C1-H1 in (1→4)-α-d-xylopyranoside (R) |
| βX1(R) | 96.8/4.26 | C1-H1 in (1→4)-β-d-xylopyranoside (R) |
| U1 | 97.0/5.07 | C1-H1 in 4-O-methyl-α-d-glucuronic acid |
| X231 | 98.3/4.72 | C1-H1 in 2,3-O-acetyl-β-d-xylopyranoside |
| X21 | 99.8/4.52 | C1-H1 in 2-O-acetyl-β-d-xylopyranoside |
| X31 | 101.3/4.28 | C1-H1 in 3-O-acetyl-β-d-xylopyranoside |
| PhGlc3 | 101.5/4.90 | C3-H3 in phenyl glycoside linkages |
| X1/Glc1 | 103.0/4.31 | C1-H1 in β-d-xylopyranoside/β-d-glucopyranoside |