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The polysaccharides from  Sarcodia montagneana  and from  Sarcodia flabellata  were examined by  13 C NMR spectroscopy. Analysis of these spectra showed the 3-linked D-galactosyl units were mostly substituted at the 2-position by sulfate ester, and at the 4,6-position by pyruvate acetal. The 4-linked galactosyl units were almost entirely in the L-configuration, the 3-position was almost entirely substituted by sulfate ester, and a high percentage of these were substituted at the 2-position by sulfate ester. However, there was also a significant fraction of the 4-linked units with 2,3,6-trisubstitution by sulfate ester, and these units appeared to be linked to 3-linked units substituted with 2-sulfate ester and pyruvate, that is, these diads had no non-substituted hydroxyl group. A previous report that  Sarcodia  polysaccharides are equivalent to λ-carrageenan is wrong, but the polysaccharide is similar to the polysaccharides previously isolated from  Trematocarpus  species, confirming an association suggested previously on the basis of gene sequencing.

The Chemical Structure of Galactans from Sarcodia montagneana and from Sarcodia flabellata