Table 1.
1H and 13C chemical shifts (ppm) of composing Glc units in the polysaccharide from M. hiantina at 50 °C
| Unit Structure |
1H and 13C chemical shiftsa, δ (ppm) |
|||||
|---|---|---|---|---|---|---|
| H1 C1 |
H2 C2 |
H3 C3 |
H4 C4 |
H5 C5 |
H6/H6’ C6 |
|
| Residue A | 5.55 | 3.81 | 4.13 | 3.81 | 4.00 | 4.00/3.88 |
| →4)-α-Glc-(1→ | 100.1 | 71.9 | 73.7 | 77.6 | 71.6 | 60.8 |
| Residue B | 5.54 | 3.78 | 3.88 | 3.59 | 3.91 | 4.03/3.88 |
| α-Glc-(1→ | 100.1 | 71.9 | 73.1 | 69.9 | 71.6 | 60.8 |
| Residue C | 5.14 | 3.76 | 4.09 | 3.76 | 4.20 | 4.05/3.86 |
| →4,6)-α-Glc-(1→ | 98.9 | 71.9 | 73.7 | 78.9 | 70.6 | 68.1 |
a
Chemical shifts are relative to external trimethylsilylpropionoic acid at 0 ppm for 1H and methanol for 13C. The relative down-field 13C resonances which are used as diagnostic peaks of the glycosidic linkages are highlighted in bold