Summary
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1.
Gypsoside in an octa- or nona-oside of gypsogenin or its derivatives and contains one residue each of D-glucose, D-galactose, L-arabinose, L-rhamnose, D-fucose, and D-glucuronic acid and two or three residues of D-xylose.
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2.
The hydrolysis of fully methylated gypsoside gives 2,3,4-tri-O-methyl- and 2,4-diO-methyl-D-xylose, 2,3,4,6-tetra-O-methyl-D-galactose, 2,3,4-tri-O-methyl-L-arabinose, 2,3,6-tri-O-methyl-D-glucose, 2,4-di-O-methyl-D-fucose, 3-O-methyl-L-rhamnose, and a very small amount of methyl 2-O-methyl-D-glucuronate.
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3.
After the reduction of methylated gypsoside and subsequent hydrolysis 2-O-methyl-D-glucose was isolated, which indicates the presence of 2-O-methyl-D-glucuronic acid in methylated gypsoside.
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4.
The carbohydrate chain of gypsoside is highly branched. The centers of the branching of the chain are D-glucuronic acid and L-rhamnose residues, and terminal sugars ane D-galactose, D-xylose, and L-arabinose.
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Kochetkov, N.K., Khorlin, A.Y. & Ovodov, Y.S. Triterpenoid saponins. Russ Chem Bull 13, 77–83 (1964). https://doi.org/10.1007/BF01179571
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DOI: https://doi.org/10.1007/BF01179571