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  • 1
    Electronic Resource
    Electronic Resource
    Interactions between terminally substituted amino acids in an aqueous and a non-aqueous environment. Enthalpic interaction coefficients in water and in N,N-dimethylformamide at 25°C (1985)
    Springer
    Journal of solution chemistry 14 (1985), S. 101-115 
    Details
    ISSN: 1572-8927
    Keywords: Solute-solute interaction ; enthalpies of dilution ; substituted amino acids ; enthalpic virial (interaction) coefficients ; group additivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Enthalpies of dilution of the N-acetyl amides of glycine, L-alanine, L-valine, L-leucine, and L-phenylalanine, dissolved in N,N-dimethylformamide (DMF) as a solvent have been measured at 25°C. The results obtained have been analyzed to give the enthalpic interaction (or virial) coefficients of the solutes and these are compared with information previously obtained in aqueous systems. There are marked differences in the interaction properties in the two solvents and, while the additivity approach of Savage and Wood is applicable to the solutes in water it is not suitable for representing the interactions in DMF. A correlation is presented between the enthalpic second virial coefficients in DMF and the propensity of side-chains to be in proximity in globular proteins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00648899
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Conformational aspects of the solvation of polyhydroxy compounds in binary mixtures of N,N-dimethylformamide and water (1988)
    Springer
    Journal of solution chemistry 17 (1988), S. 139-152 
    Details
    ISSN: 1572-8927
    Keywords: α-D-glucose ; β-D-fructose ; sucrose ; enthalpies of solution ; mutarotation ; preferential solvation ; hydrophobic hydration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Enthalpies of solution of β-D-fructose and sucrose in binary solvent mixtures of water and N,N-dimethylformamide (DMF) at 25°C over the whole mole fraction region are reported and compared to those of α-D-glucose. Because in these solvent systems the mutarotation of β-D-fructose is fast and accompanied by large enthalpy changes, the measured enthalpies of solution of this compound had to be corrected for this effect. The dependences of the enthalpies of solution on the composition of the solvent mixtures are considered to result from preferential hydrogen-bonding of the hydroxyl groups and hydrophobic hydration of the apolar parts of the surface of the solute molecule. Distinctions between the enthalpy of transfer curves are discussed in terms of conformational differences and additivity aspects in the solvation behavior of the compounds. The predominance of furanose forms of fructose in DMF and that of pyranose forms of the same solute in water are related to differences in solvation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646433
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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