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22045

Sigma-Aldrich

ι-Carrageenan

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About This Item

CAS Number:
9062-07-1
EC Number:
232-949-3
MDL number:
MFCD00151512
UNSPSC Code:
12352201

viscosity

~14 mPa.s, 0.3 % in chloroform(20 °C)

solubility

H2O: soluble 5 mg/mL (hot)

InChI

1S/C24H38O31S4/c25-1-5-12(52-56(31,32)33)9(27)10(28)22(46-5)49-14-8-4-44-18(14)20(55-59(40,41)42)24(48-8)51-16-11(29)23(47-6(2-26)15(16)53-57(34,35)36)50-13-7-3-43-17(13)19(21(30)45-7)54-58(37,38)39/h5-30H,1-4H2,(H,31,32,33)(H,34,35,36)(H,37,38,39)(H,40,41,42)/p-4/t5-,6-,7-,8-,9-,10-,11-,12+,13+,14+,15+,16-,17+,18+,19-,20-,21+,22+,23+,24-/m1/s1

InChI key

QIDSWKFAPCTSKL-RRQHLKGPSA-J

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General description

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-) sulfates per disaccharide unit. In ionic solutions, κ- and ι-carrageenans self-associate into helical structures that form rigid or flexible gels, respectively. λ-carrageenans do not form helices and are non-gelling. Carrageenans are used commercially as thickeners and stabilizing agents.
soluble in hot concentrated salt solutions

Application

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 sulfation, they may be studied comparatively for differences in protective, antiviral, and immunosuppression activities.

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