Table 2.
The most diagnostic peaks in the IR spectra of extracted polysaccharides
| Fucoidans | Assignment | ||
|---|---|---|---|
| C. compressa | C. crinita | C. sedoides | |
| 3421 cm−1 | 3411 cm−1 | 3412 cm−1 | O-H assoc. stretching vibration |
| 2925 cm−1 | 2925 cm−1 | 2928 cm−1 | C-H stretching vibration |
| 1652 cm−1 | 1641 cm−1 | 1639 cm−1 | C = O stretching vibration |
| 1457 cm−1 | 1441 cm−1 | 1423 cm−1 | asymmetrical bending vibration of CH3 |
| 1263 cm−1 | 1231 cm−1 | 1231 cm−1 | S O stretching vibration |
| 1049 cm−1 | 1050 cm−1 | 1050 cm−1 | C-O-C stretching vibration |
| 826 cm−1 | 825 cm−1 | 825 cm−1 | C–O–S vibration |