Ekaterina A Martyyas

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Three new minor triterpene glycosides, cucumariosides I1 (1), I3 (2) and I4 (3) have been isolated from the Far Eastern sea cucumber Eupentacta fraudatrix. Structures of the glycosides were elucidated by 2D NMR spectroscopy and MS. Glycosides 1-3 belong to the group of cucumariosides I, havingbranched pentasaccharide carbohydrate moieties with two sulfate(More)
Five new minor triterpene glycosides, typicosides A1 (1), A2 (2), B1 (3), C1 (4) and C2 (5), along with two known glycosides, intercedenside A and holothurin B3, have been isolated from the sea cucumber Actinocucumis typica. Structures of the glycosides were elucidated by 2D NMR spectroscopy andMS. Glycosides 1-5 are linear mono- and disulfated tetraosides(More)
Two new minor triterpene glycosides, cucumariosides B1 (1) and B2 (2) have been isolated from the Far Eastern sea cucumber Eupentacta fraudatrix. Structures of the glycosides were elucidated by 2D NMR spectroscopy and MS. Glycosides 1 and 2 belong to the cucumariosides B group and have unprecedented trisaccharide carbohydrate moieties without sulfate(More)
Seven new minor triterpene glycosides, cucumariosides A2 (1), A7 (2), A9 (3), A10 (4), A11 (5), A13 (6) and A14 (7) have been isolated from the Far Eastern sea cucumber Eupentacta fraudatrix. Structures of the glycosides were elucidated by 2D NMR spectroscopy and MS. Glycosides 1-7 belong to the group of cucumariosides A, having linear tetrasaccharide(More)
The biological activity of lipids and photosynthetic pigments of the kelp Sargassum pallidum (Turner) C. Agardh has been studied. Free fatty acids and their esters demonstrated considerable antimicrobial activity against bacteria (Staphylococcus aureus and Escherichia coli), yeast-like fungi (Candida albicans), and opportunistic pathogenic (Aspergilius(More)
New steroid glycosides, hylodoside A (1) and novaeguinoside Y (2), along with previously known polyhydroxylated steroids (3-7) were isolated from the ethanolic extracts of the starfish Leptasterias hylodes reticulata and Culcita novaeguineae (juvenile). The structures have been elucidated using 1D and 2D NMR spectra (1H, 13C, DEPT, COSY-45, 1D-TOCSY,(More)
The lipid compositions from four alga species of the family Laminariaceae and one species of the family Alariaceae in addition to the antimicrobial and hemolytic activity of the lipids and pigments from these algae were studied. Total lipids (TL) from the Laminariaceae algae, in contrast with those from the Alariaceae alga, were more active against(More)
Seven new minor triterpene glycosides, cucumariosides A1 (1), A3 (2), A4 (3), A5 (4), A6 (5), A12 (6) and A15 (7) have been isolated from the Far Eastern sea cucumber Eupentacta fraudatrix. Structures of the glycosides were elucidated by 2D NMR spectroscopy and MS. Glycosides 1-7 belong to the group of cucumariosides A, having linear tetrasaccharide(More)
The contents of total lipids (TL), individual lipid classes, and photosynthetic pigments (PSP) from the brown alga Fucus evanescens (C. Agardh) from different habitats (Kuril Ridge, Sea of Okhotsk, and Rudnaya Bay, Sea of Japan) and the antimicrobial and hemolytic activity of the lipids were studied. It was shown that the habitat, alga collection time, and(More)
The natural cyclopentene β, β'-triketone coruscanone B and its methyl enol ether coruscanone A, metabolites of the higher plant Piper coruscans, in addition to 19 of their simple analogs have been synthesized. The antimicrobial activity of the synthesized compounds against Gram-positive (Staphylococcus aureus ATCC 21027) and Gram-negative (Escherichia coli(More)