| | Wavenumber (cm−1) | Assignment | Found in Carrageenans | Extracted Carrageenan from H. bryoides |
| | 1210-1260 | Sulfate ester (O-SO−3) (S) | k, i, λ, μ, v, θ, ξ | Present | | 928-933, 1070 (shoulder) | 3,6-anhydro-D-galactose (DA) | k, β | Present | | 840-850 | D-galactose-4-sulfate (G4S) | k, i, μ, v | Present | | 830 | D-galactose-2-sulfate (G2S) | λ, θ, ξ | Not found | | 820, 825 (shoulder) | D-galactose-2,6-disulfate (D2S,6S) | λ, v | Not found | | 810-820, 867 (shoulder) | D-galactose-6-sulfate (D6S) | μ | Not found | | 800-805, 905 (shoulder) | 3,6-anhydro-D-galactose-2-sulfate (DA2S) | i, θ | Not found |
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