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  • 11
    Electronic Resource
    Electronic Resource
    Volume and compressibility changes on mixing aqueous solutions of the amino acid and poly(ethylene glycol) (1994)
    Springer
    Colloid & polymer science 272 (1994), S. 385-392 
    Details
    ISSN: 1435-1536
    Keywords: PEG ; amino acid ; excess volume ; excess compressibility ; hydrophobic interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The volume and compressibility changes on mixing aqueous solutions of the amino acid and poly(ethylene glycol) were measured with a vibration densimeter and a sing-around velocimeter at 298.15 K. For the system of alanine-PEG-H2O, the additivity rule for the mean apparent molal volume and compressibility at infinite dilution held, and the excess volume and compressibility changes on mixing were obtained. For the system of glycine-PEG-H2O, the additivity rule for the mean apparent molal compressibility at infinite dilution did not hold. While the mean apparent molal volume and compressibility changes were negative and positive for the systems of another amino acid-PEG-H2O, respectively, where amino acids were valine, isoleucine, leucine, phenylalanine, and tryptophan. These results suggest that glycine and alanine are excluded from the hydration layer around PEG chain and the amino acids with a larger side chain than alanine are bound to the PEG chain due to the hydrophobic interaction. The hydration number per monomer around PEG chain was estimated to be 3.9.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659449
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  • 12
    Electronic Resource
    Electronic Resource
    Solubility of amino acids in aqueous poly (ethylene glycol) solutions (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 1035-1041 
    Details
    ISSN: 1435-1536
    Keywords: PEG ; amino acid ; solubility ; hydrophobic interaction ; dynamic hydration number
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The solubilities of amino acids have been measured in water and aqueous poly(ethylene glycol) (PEG) solutions as a function of temperature and PEG concentration. The free energies of transfer from water to aqueous PEG solutions forl-alanine,l-valine,l-isoleucine andl-leucine were positive, while those forl-phenylalanine andl-tryptophan were negative. The corresponding enthalpies of transfer were almost zero for all amino acids. The equilibrium constants of the binding of amino acids to PEG chain were estimated from the solubility data. Amino acids with larger hydrophobicity are bound more strongly to the PEG chain due to the hydrophobic interaction between the methylene groups of PEG and the side chain of amino acid. The equilibrium constants showed a correlation with the dynamic hydration number (n DHN) which expresses the hydration properties of amino acids in aqueous solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659292
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    Paper (German National Licenses)
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  • 13
    Electronic Resource
    Electronic Resource
    Interaction of dye and synthetic sucrose polymer Ficoll (1970)
    Springer
    Colloid & polymer science 238 (1970), S. 423-425 
    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: Zusammenfassung Die Wechselwirkung zwischen Ficoll und Benzopurpurin 4B wurde mit den Methoden der Spektroskopie und der Viskositätsmessung untersucht. Aus den Bindungsdaten wurde die molare Änderung von Entropie und Enthalpie und die Zahl der Brückenstellen des Polymeren berechnet. ΔH 0 und ΔS 0 sind beide positiv. Dern-Wert nimmt mit der Temperatur zu. Dies ist durch die Änderung der Konfiguration der Polymerketten zu erklären. Die Viskositätsabnahme mit Zusatz von Farbstoff ist auf die Bildung von Farbstoffbrücken zurückzuführen.
    Notes: Summary The interaction of Ficoll and Benzopurpurine 4B was studied by spectral method and viscosity measurement. From the binding data the molar changes in entropy and enthalpy, and the number of binding sites on polymer were calculated. Both values of ΔH 0 and ΔS 0 were positive. The valuen increases with increasing temperature. These results may be explained by the change of the configuration of polymer chain. The intrinsic viscosity reduction in the presence of the dye is due to the formation of dye bridges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02085565
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  • 14
    Electronic Resource
    Electronic Resource
    Effect of the degree of polymerization and etherification on the binding of acridine orange by sodium carboxymethyl cellulose (1971)
    Springer
    Colloid & polymer science 243 (1971), S. 97-100 
    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: Zusammenfassung Die Wechselwirkung zwischen Natriumcarboxymethylcellulose und Acridinorange wurde mit den spektroskopischen Methoden untersucht. Der Effekt des Polymerisationsgrades und des Verätherungsgrades bei der Verbindung mit Acridinorange wurde diskutiert. Die Bindungszahl nimmt mit dem Polymerisationsgrad zu. Die Zahl von den Adsorptionsstellen der Glukoseeinheit wird größer mit der Verätherung. Deshalb ist offensichtlich die elektrostatische Wechselwirkung kein vorherrschender Faktor.
    Notes: Summary The interaction between sodium carboxymethyl cellulose and acridine orange was studied by spectral method. The effect of the degree of polymerization and etherification on the binding of the dye was discussed. The binding value increases with an increase in the degree of the polymerization. The number of binding sites per unit glucose was larger than the degree of etherification. Therefore, the electrostatic interaction was probably not the predominant factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01521130
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  • 15
    Electronic Resource
    Electronic Resource
    Interaction of dye and polysaccharides (1969)
    Springer
    Colloid & polymer science 233 (1969), S. 896-898 
    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: Zusammenfassung Die Wechselwirkung zwischen Amylose, Amylodextrin und Benzopurpurin 4 B wurde mit den Methoden der Spektroskopie und der Gleichgewichtsdialyse untersucht. Die molare Änderung von Entropie und Enthalpie wurde aus der Bindungskonstante berechnet. ΔH° und ΔS° sind beide positiv. Sie sind damit zu erklären, daß die Kettenbeweglichkeit der Polymeren mit der Temperatur zunimmt.
    Notes: Summary The interactions between amylose, amylodextrine and Benzopurpurine 4 B were studied by spectral and equilibrium dialyses methods. From the binding constant of amylose and amylodextrine, the molar changes in entropy and enthalpy for binding of the dye were calculated. BothΔH° andΔS° were positive. The positive value ofΔS° may be explained by the increase of flexibility of the polymer chain with increasing temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01508011
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    Paper (German National Licenses)
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