Carrageenan

Description

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. It was also used as an adhesive in traditional Chinese painting mounting.

Synonyms and Related Terms

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

Risks

• CDH Fine Chemicals: MSDS

Physical and Chemical 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

Working Properties

• Smooth and slippery with very little tack
• Shrinks significantly upon drying

Resources and Citations

• AIC Global Conservation Forum: Query on Iota Carrageenan as an adhesive for paper conservation Thread date Nov.1 2023.
• Wikipedia: Carrageenan Accessed Nov. 2023