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A water-soluble polysaccharide extracted from several species of red algae such as Chondrus crispus. Carrageenan forms thermo-reversible gels that can change from gel to liquid with changing temperatures. It is used as an emulsifier and stabilizer in food products. In the mid 19th century, carrageenan was used as a size for marbled papers.

Synonyms and Related Terms

3,6-anhydro-d-galactan; carragenano (Esp.); carragenina (It); carageenan; carrageen; carrageenin

Other Properties

Soluble in hot water, hot milk, and salted cold water. Insoluble in 35% ethanol/water solution. Most stable at pH 9.

CAS 9000-07-1

Hazards and Safety

Sigma Chemical: MSDS

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