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  • 1975-1979  (3)
  • Polymer and Materials Science  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 3201-3209 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Einige Copolymere aus L-Glutaminsäure und L-Tyrosin werden mit p-Carboxybenzoldiazoniumchlorid behandelt. Durch eine stöchiometrische Reagensmenge werden Monoazo-tyrosin-Chromophore in den Polypeptid-Ketten gebildet, während ein Reagensüberschuß zur Bildung einer Mischung von Mono- und Bisazoderivaten führt. In allen Fällen kann nur ein Teil der Tyrosin-Grundbausteine verändert werden. Die Ergebnisse werden mit den verschiedenen pKa-Werten für die Ionisierung der OH-Gruppen in den Tyrosin- und Azotyrosin-Grundbausteinen erklärt.
    Notes: Some copolymers of L-glutamic acid and L-tyrosine are treated with p-carboxybenzenediazonium chloride. Monoazotyrosine chromophores can be obtained along the polypeptide chains in the presence of a stoichiometric quantity of the reagent, whereas an excess of the reagent gives rise to the formation of a mixture of mono- and bis-azoderivatives. In all the cases only a part of the total number of the tyrosine residues can be modified. The results are discussed on the basis of the pKa values for the ionization of tyrosine and azo-tyrosine OH-groups.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acetyl-(dehydro-Phe) and acetyl-bis(dehydro-Phe) groups have been attached to the ε-amino group of the lysine residues of the copolymer poly(Glu92Lys8) by reacting this last with acetyl-(dehydro-Phe)-azlactone and acetyl-bis(dehydro-Phe)-azlactone, respectively.In the latter case induced CD is observed between 250 and 330 nm, due to the relative dissymmetric disposition of the two dehydro-Phe groups under the chiral field of the polypeptide chain.pH dependence of the induced CD, observed for the copolymer and lacking in the lowmolecular-weight structural model, is related to the α-helical and random coiled conformation of the polypeptide chain.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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