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  • Amphiphiles  (1)
  • Cesium selectivity  (1)
  • FAB mass spectrometry  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Structures of acidic O-linked polylactosaminoglycans on human skim milk mucins (1990)
    Springer
    Glycoconjugate journal 7 (1990), S. 525-543 
    Details
    ISSN: 1573-4986
    Keywords: O-linked glycans ; acidic carbohydrates ; mucins ; human milk ; FAB mass spectrometry ; NMR spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract O-Linked glycans were isolated from human skim milk mucins or mucin-derived high-molecular weight glycopeptides and fractionated by anion exchange chromatography into neutral and acidic alditols. Major oligosaccharides contained in the acidic fraction were purified by high performance liquid chromatography and structurally characterized by a combination of fast atom bombardment mass spectrometry, methylation analysis and 500 MHz1H-nuclear magnetic resonance spectroscopy. The structural aspects exhibited by these major species in the acidic fraction resemble those established previously for the neutral oligosaccharides from human skim milk mucins: 1) the size of the alditols varies from tri- to decasaccharides 2) the core structure is of the ubiquitous type 2 3) the backbone sequences are of the poly-N-acetyllactosamine type with a particular preponderance of linearly extended GlcNAcβ(1–3)Gal (major) or GlcNAcβ(1–6)Gal units (minor). N-Acetylneuraminic acid on monosialylated (mucin- or glycopeptide-derived) and disialylated glycans (glycopeptide derived) is linked predominantly to position C-3 of galactose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189075
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  • 2
    Electronic Resource
    Electronic Resource
    Ein makrobicyclischer Großhohlraum zur selektiven Komplexierung von Alkalimetall-Ionen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2391-2393 
    Details
    ISSN: 0009-2940
    Keywords: Host-guest chemistry ; Macrobicyclic ligand ; Alkali metal complexation ; Complex formation ; Cesium selectivity ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Large Macrobicyclic cavity for the Selective Complexation of Alkali Metal IonsThe preparation of the new ligand 3 was carried out starting with the podand 8 and the triamine 11. Ligand 3 forms complexes with alkali metal ions in solution (chloroform) as well as under the conditions of FAB mass spectrometry, whereby Cs⊕ selectivity is observed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891221227
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesen von Galactose-Cluster-haltigen Steroid-DerivatenAuszugweise vorgetragen auf der Chemiedozenten-Tagung, Bielefeld, 7, März 1989. (1990)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1990 (1990), S. 863-869 
    Details
    ISSN: 0170-2041
    Keywords: Glycoconjugates ; Galactosides ; Steroid esters ; Amphiphiles ; Glycopeptides ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Galactose-Cluster-Containing Steroid DerivativesThe synthesis of galactose clusters that are linked to a steroid moiety by a peptide-like spacer unit is described. The galactose cluster is obtained by Koenigs-Knorr glycosylation of TRIS-Gly-Fmoc (2b) under Helferich conditions. Peptide and ester bonds are formed after activation of carboxylic acids as diphenylthiophene dioxide (TDO) esters. 6a is synthesized in a convergent way by coupling of (Ac4Gal)3-TRIS-Gly (3e) with cholesteryl TDO succinate (5b). Coupling of (Ac4Gal)3-TRIS-Gly hydrogen succinate (3f) with Gly-O-Chol (5d) by means of EEDQ yields 6d. Reaction of (Ac4Gal)3-TRIS-Gly-SUCC-O-TDO (3g) with 25-hydroxycholesterol leads in a linear sequence to the oxysterol derivative 6f. Selective cleavage of the acetyl groups from galactose units yields the known compound 6b and the new derivatives 6e and 6g.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1990199001162
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