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  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Biologisch aktive Glycoside aus Asteroidea, XIII. - Glycosphingolipide aus dem Seestern Acanthaster planci, 22). - Isolierung und Struktur von sechs neuen CerebrosidenSechs neue Cerebroside (Ceramid-monohexoside), Acanthacerebrosid A (1), B (2), C (3), D (4), E (5) und F (6), wurden aus der wasserunlöslichen Lipid-Fraktion des Chloroform-Methanol-Extrakts des Seesterns Acanthaster planci isoliert. Auf Grund der chemischen und spektrometrischen Untersuchungen ließen sich die Strukturen als 1-O-(β-D-Glucopyranosyl)-substituiertes (2S,3S,4R)-2-[(2R)-2-Hydroxytetracosanoylamino]-1,3,4-hexadecanetriol (1), (2S,3S,4R)-2-[(2R)-2-Hydroxyhexadecanoylamino]-1,3,4-docosantriol (2), (2S,3S,4R,13E)-2-[(2R)-2-Hydroxyhexadecanoylamino]-13-docosen-1,3,4-triol (3), (2S,3R,4E,10E)-2-[(2R)-2-Hydroxydocosanoylamino]-4,10-octadecadien-1,3-diol (4), (2S,3R,4E,10E)-2-[(2R)-2-Hydroxytricosanoylamino]-4,10-octadecadien-1,3-diol (5) und (2S,3R,4E,10E)-2-[(2R)-2-Hydroxytetracosanoylamino]-4,10-octadecadien-1,3-diol (6) charakterisieren. Die Isolierung der strukturell sehr ähnlichen Cerebroside gelang durch Reversed-Phase-HPLC. Negativ-FABMS-Spektrometrie ließ sich erfolgreich zur Molmassen-Bestimmung der Cerebroside einsetzen.
    Notes: Six new cerebrosides (ceramide monohexosides), acanthacerebroside A (1), B (2), C (3), D (4), E (5), and F (6) were isolated from the water-insoluble lipid fraction of the chloroform-methanol extract of the starfish Acanthaster planci. On the basis of chemical and spectral evidences, they were characterized as 1-O-(β-D-glucopyranosyl)-substituted (1S,3S,4R)-2-[(2R)-2-hydroxytetracosanoylamino]-1,3,4-hexadecanetriol (1), (2S,3S,4R)-2-[(2R)-2-hydroxyhexadecanoylamino]-1,3,4-docosanetriol (2), (2S,3S,4R,13E)-2-[(2R)-2-hydroxyhexadecanoylamino]-13-docosene-1,3,4-triol (3), (2S,3R,4E,10E)-2-[(2R)-2-hydroxydocosanoylamino]-4,10-octadecadiene-1,3-diol (4), (2S,3R,4E,10E)-2-[(2R)-2-hydroxydocosanoylamino]-4,10-octadecadiene-1,3-diol (5), and (2S,3R,4E,10E)-2-[(2R)-2-hydroxytetracosanoylamino]-4,10-octadecadiene-1,3-diol (6). Reversed-phase HPLC was effective to isolate these cerebrosides revealing the very close resemblance in structure. Negative FABMS spectrometry was useful in providing information on the molecular mass of the cerebrosides.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Biologisch aktive Glycoside aus Asteroidea, XVII. - Glycosphingolipide aus dem Seestern Acanthaster planci, 3. - Isolierung und Struktur von zwei neuen Ceramid-LactosidenAus der wasserlöslichen Lipid-Fraktion des Chloroform/Methanol-Extraktes des Seesterns Acanthaster planci ließen sich zwei neue Acanthalactoside A (1) und B (2) isolieren. Aufgrund chemischer und spektroskopischer Befunde wurden die Strukturen von 1 und 2 als 1-O-[β-D-Galactopyranosyl-(1→4)-β-D-glucopyranosyl]-substituiertes (2S,3S,4R)-2-[(2R)-2-hydroxytetracosanoylamino]-1,3,4-hexadecanetriol (1) und (2S,3S,4R,13E)-2-[(2R)-2-hydroxyhexadecanoylamino]-13-docosen-1,3,4-triol (2) ermittelt. Die Isolierung des Glycosphingolipid-Gemisches aus der wasserlöslichen Lipid-Fraktion, die auch anderes Material wie zum Beispiel Steroid-Saponine enthalten, gelang mit Hilfe der Reversed-phase-Säulenchromatographie. Reversed-phase-HPLC ließ sich effektiv zur Isolierung der strukturell sehr ähnlichen Ceramiddihexodside einsetzen. Negativ-FAB-Massenspektrometrie diente zur erfolgreichen Bestimmung und Absicherung der Struktur der Ceramid-dihexoside.
    Notes: Two new ceramide lactosides, acanthalactoside A (1) and B (2) were isolated from the water-soluble lipid fraction of the chloroform/methanol extract of the starfish Acanthaster planci. On the basis of chemical and spectral evidence, the structures of 1 and 2 were characterized as 1-O-[β-D-galactopyranosyl-(1→4)-β-D-glucopyranosyl]-substituted (2S,3S,4R)-2-[(2R)-2-hydroxytetracosanoylamino]-1,3,4-hexadecanetriol (1) and (2S,3S,4R,13E)-2-[(2R)-2- hydroxyhexadecanoylamino]-13-docosene-1,3,4-triol (2), respectively. Reversed-phase column chromatography was useful to obtain the glycosphingolipid mixture from the watersoluble lipid fraction containing also other material such as steroid saponins. Reversed-phase HPLC was also effectual to isolate these ceramide dihexosides reveling very close resemblance in structure. Negative FAB mass spectrometry was successfully used for the determination and confirmation of the ceramide dihexosides.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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