kappa-Carrageenan, Sigma-Aldrich®

Supplier: Merck
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Synonyms: Irish moss

SIAL22048-100G-FEA 77.6 GBP
SIAL22048-100G-F SIAL22048-25G-F
kappa-Carrageenan, Sigma-Aldrich®
kappa-Carrageenan

Sulphated plant polysaccharide.


Carrageenans are used to suppress immune response in vivo and in vitro via mechanisms believed to involve selective cytopathic effect on macrophages. As ι-, κ-, and λ-carrageenans have varying degress of sulphation, they may be studied comparatively for differences in protective, antiviral, and immunosuppression activities. May be used in immobilisation of microbial cells based on the growth of cell in gel.


Carrageenans are mucopolysaccharides from the cell walls of the red algae. They are anionic linear polymers composed of 1,3α-1,4β-galactans having one (κ-), two (ι-) or three (λ-) sulphates per disaccharide unit. In ionic solutions, κ- and ι-carrageenans self-associate into helical structures that form rigid or flexible gels, respectively. Carrageenans are used commercially as thickeners and stabilising agents.

Formula: C₁₂H₁₇O₁₃S
MW: 401.32 g/mol
MDL Number: MFCD00151514
CAS Number: 11114-20-8
EINECS: 234-350-2

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Specification Test Results

Loss on Drying ≤12%
Infrared Spectrum Conforms to Structure
Viscosity (Rotation) 5 - 25 mPas
Viscosity (Conditions) 0.3% in H₂O, 25 °C, DIN 45, 100 s⁻¹

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