Table 2.
Proton chemical shifts for acharan sulfate from snail mucus (AS-GAG). Protons labeled as I and G refer to Iduronic acid (IdoA) and N-acetyl glucosamine (GlcNAc) units, respectively.
| Protona | Chemical Shifts/ppm |
|||||
|---|---|---|---|---|---|---|
| Acharan sulfate (This work) | Acharan sulfate [10] | Acharan sulfate [12] | Acharan sulfate [14] | IdoA(2S)-GlcNS(6S) [28] | IdoA-GlcNAc [29] | |
| I-1 | 5.237 | 5.19 | 5.20 | 5.17 | 5.22 | 4.89 |
| I-2 | 4.339b | 4.34b | 4.34b | 4.33b | 4.35b | 3.65 |
| I-3 | 4.270 | 4.28 | 4.19 | 4.27 | 4.20 | 3.83 |
| I-4 | 4.020 | 4.03 | 4.05 | 4.01 | 4.10 | 4.04 |
| I-5 | 4.932 | 4.93 | 5.08 | 4.90 | 4.81 | 4.68 |
| G-1 | 5.097 | 5.11 | 5.07 | 5.10 | 5.39 | 5.11 |
| G-2 | 4.015 | 4.02 | 3.97 | 4.01 | 3.29 | 4.00 |
| G-3 | 3.751 | 3.74 | 3.70 | 3.72 | 3.67 | 3.73 |
| G-4 | 3.758 | 3.74 | 3.70 | 3.73 | 3.77 | 3.73 |
| G-5 | 3.863 | 3.87 | 3.71 | 3.85 | 4.03 | 4.00 |
| G-6 | 3.864, 3.948 | 3.87 | 3.82 | 3.85, 4.00 | 4.27b | 3.85 |
| Acetyl | 2.061 | 2.08 | 2.04 | 2.06 | – | 2.04 |