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Functional groups of UPPS-B1 and S-UPPS-B1 in the infrared spectrum.
| Absorption peak (cm-1) | ||
|---|---|---|
| Vibration mode | UPPS-B1 | S-UPPS-B1 |
| Stretching of O-H | 3408.89 | 3442.03 |
| Stretching of C-H | 2927.82 | 2926.84 |
| Asymmetric stretching of C=O | 1606.86 | 1638.62 |
| Symmetric stretching of C=O | 1420.29 | 1401.57 |
| Stretching of S=O | - | 1238.60 |
| Stretching of C-O-S | 822.81 | 822.29 |
S-UPPS-B1, sulfated Undaria pinnatifida polysaccharides fraction B1.
