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| Frequency | Seaweed polysaccharide | |
|---|---|---|
| Bond | Functional groups | |
| 3327.21 | O–H stretch | Alcohol |
| 2939.52 | O–H stretch | Carboxylic acids |
| 1600.92 | C–C stretch | Carbonyl group |
| 1381.03 | SO | Sulphate groups |
| 1126.43 | C–O stretch | Carboxylic acids |
| 1087.85 | RO–SO3− | Sulphate groups |
| 1037.70 | RO–SO3− | Sulphate groups |
| 650.01 | C–Cl stretch | Alkyl halides |
| 597.93 | C–Br stretch | Alkyl halides |
