Structures of Violaceusosides C,D,E and G,Sulfated Triterpene Glycosides from the Sea Cucumber Pseudocolochirus violaceus (Cucumariidae,Dendrochirotida)
Free accessResearch articleFirst published online March, 2014
Structures of Violaceusosides C,D,E and G,Sulfated Triterpene Glycosides from the Sea Cucumber Pseudocolochirus violaceus (Cucumariidae,Dendrochirotida)
Four new triterpene glycosides, violaceusosides C (1), D (2), E (3) and G (4) have been isolated from the sea cucumber Pseudocolochirus violaceus (Cucumariidae, Dendrochirotida). Eight known glycosides, DS-holothurin A and holothurinoside A, isolated earlier from Holothuria forskalii (order Aspidochirotida); and violaceuside A, lefevreoside C, philinopside E, intercedenside B, violaceuside II and liovilloside A isolated earlier from representatives of the family Cucumariidae, order Dendrochirotida have also been found in P. violaceus. The chemical structures of the glycosides were elucidated by 2D NMR spectroscopy and mass spectrometry. Violaceusosides C (1), D (2), E (3) and G (4) have holostane-type aglycones and tetrasaccharide linear carbohydrate chains differing in the sugar composition and the number and position of sulfate groups. Violaceusosides E (3) and G (4) are characterized by the presence of a sulfate group at C-3 of the quinovose residue that is very rare among sea cucumber glycosides. Cytotoxic activities of the glycosides 1–4 against cells of the ascite form of mouse Ehrlich carcinoma and hemolytic activities against mouse erythrocytes have been studied. Violaceusosides C (1) and D (2) demonstrated moderate cytotoxic and hemolytic effects, while violaceusosides E (3) and G (4) have more powerful activities.
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