Sulfated galactans carrageenans

Agars, including highly substituted agaran—agarose hybrids Typical carrageenans and DL-hybrids Complex sulfated galactans (DL-hybrids)... 

A. A. Kolender and M. C. Matulewicz, Desulfation of sulfated galactans with chlorotrimethylsilane. Characterization of /J-carrageenan by -NMR spectroscopy, Carbohydr. Res., 339 (2004) 1619-1629. 

K. H. Johnston and E. L. McCandless, The immunologic response of rabbits to carrageenans, sulfated galactans extracted from marine algae, J. Immunol., 101 (1968) 556-562. 

There are many studies involving and C-NMR spectroscopy of carrageenans, a family of polysaccharides with the structure of linear sulfated galactans. They are extracted from certain species of red seaweed and have been used for a long time as natural texturing ingredients in the food industry. 

Sulfated galactans from Schyzimenia binderi are DL-hybrids, with predominance of carrageenan structures devoid of 3,6-anhydrogalactose. Sulfation was found on C-2, C-4, or both positions, on the 3-linked p D-galactose units and on C-3 on the 4-linked a-galactose residues (Matsuhiro, Conte, Damonte, Kolender, Matulewicz, Mejias, Pujol, Zuniga 2005). 

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