Carrageenan - Wikipedia

Kappa-carrageenan has one sulphate group per disaccharide, Iota-carrageenan has two, and Lambda-carrageenan has three. Gelatinous extracts of the Chondrus crispus ...

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Carrageenan is extracted from red seaweed, most commonly of the Chondrus crispus, Eucheuma cottonii, Eucheuma spinosum, or Gigartina stellata species.