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  • 1970-1974  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Optische Messungen an Amylose-Farbstoff-Komplexen (1970)
    Springer
    Colloid & polymer science 239 (1970), S. 578-580 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary Upon addition of Congo red, neutral aqueous solutions of amylose show several induced Cotton-effects in the regio of the dye absorption bands. It is assumed that Congo red forms sterically ordered adducts with helical amylose segments. With several other azo dyes (methyl orange, α-naphthol orange, chrysophenin G), no induced Cotton-effects were observed.
    Notes: Zusammenfassung In neutralen wäßrigen Lösungen, die Amylose und Kongorot enthalten, treten im Bereich der Absorptionsmaxima Abweichungen von der normalen optischen Rotationsdispersion und mehrere induzierte Cotton-Effekte auf. Hieraus wird auf eine geordnete Assoziation der Farbstoffmoleküle an helicale Segmente der Amylose geschlossen. Bei Methylorange, β-Naphtholorange und Chrysophenin G sind keine induzierten Cotton-Effekte zu beobachten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02133312
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Conformation of amylose in aqueous solution: Optical rotatory dispersion and circular dichroism of amylose-iodine complexes and dependence on chain length of retrogradation of amylose (1971)
    New York : Wiley-Blackwell
    Biopolymers 10 (1971), S. 243-261 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dependence on chain length of two characteristic properties of amylose, i.e., retrogradation and complex formation with iodine, have been studied by using enzymatically synthesized, homodisperse amyloses. The association rates of amyloses in water containing 5% dimethyl sulfoxide have a sharp maximum at a degree of polymerization P̄n of 80; shorter and longer molecules are much more soluble. The iodine complexes of amylose exhibit a strong Cotton effect in the range of the long-wave absorption maximum (position depending on chain length) and two weaker Cotton effects at 480 and 350 nm. The long-wave Cotton effect is most intense at about P̄n 50 and decreases rapidly for shorter and longer chains. This behavior is unexpected and is not in accordance with the further increase of λmax and λmax. The experiments can best be interpreted by assuming well ordered, stiff chains in the low molecular weight range (P̄n 50-80). For longer chains, the findings are discussed in the light of current concepts of amylose conformation in aqueous solution, namely the model of the broken helical chain (alternating stiff helical segments and unordered regions) and the model of a flexible coil without a significant helical content. However, according to the results given in this paper, a wormlike helical chain seems to be the most adequate model for amylose conformation in neutral solution.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360100203
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    1 3C-NMR-Spektroskopie an Polyäthern (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 86 (1974), S. 450-450 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19740861216
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    Paper (German National Licenses)
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