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  • 1
    Electronic Resource
    Electronic Resource
    Liquid membrane transport of supramolecular complexes of some amines and amino acids with macrocyclic ligands (1995)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 23 (1995), S. 167-174 
    Details
    ISSN: 1573-1111
    Keywords: Amines ; amino acids ; liquid membrane ; macrocyclic ligands ; active transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The transport of some amines in protonated form was studied (viz. methylamine, dimethylamine, diethylamine andn-propylamine) and α-amino acids (l-leucine,l-methionine,l-isoleucine,l-phenylalanine,l-valine,l-α-alanine andl-cysteine). The following macrocyclic ligands were used as carriers throughout the experiments: 15-crown-5 (15C5), 18-crown-6 (18C6), benzo-18-crown-6 (B18C6), dibenzo-18-crown-6 (DB18C6), diazacrown ether [2.2] (1,7,10,16-tetraoxa-4,13-diazacyclooctadecane) and cryptand [2.2.2] (4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo [8.8.8] hexacosane). The active transport, assisted by pH gradient, of amino acids and amines in protonated form as ion pairs in the presence of picrate anion was performed. The experiments suggested the influence of the ligand size, the donor atom type, and the substituents on the transport phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00709574
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Complexation of Amino Acids by Crown Ethers and Cryptands in Methanol (1998)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 30 (1998), S. 21-28 
    Details
    ISSN: 1573-1111
    Keywords: Amino acids ; crown ethers ; cryptands ; complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Complex formation between several crown ethers and the cryptand (222) and α-amino acids in methanol was studied by calorimetric titration. The ligand structure and the donor atoms of the ligands play an important role in determining the measured values of the reaction enthalpies and entropies. However, with the exception of the diaza crown ether (22) all stability constants are of the same order of magnitude. The enthalpic and entropic contributions to the stabilities of the complexes formed compensate each other. In methanolic solution the amino acids exist in their zwitterionic form. This equilibrium can be influenced. Under acidic, neutral or basic conditions different values of the reaction enthalpies are measured for the complexation of some amino acids with 18-crown-6. These results demonstrate that the concentration of the zwitterionic form of the α-amino acids can be influenced. Thus the reaction between macrocyclic and macrobicyclic ligands and amino acids should be described by at least two different reaction schemes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007941023186
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The transport of amino acids by 18-crown-6 through liquid membranes (1994)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 17 (1994), S. 45-51 
    Details
    ISSN: 1573-1111
    Keywords: Amino acid ; liquid membrane ; 18-crown-6 ; active transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The possibility of separating in cationic form some α-amino acids (L-Methionine, L-Leucine, L-Isoleucine, L-Valine, L-Phenylalanine, L-α-Alanine and L-Cysteine) from mixtures in the presence of picrate anion has been investigated by means of active transport assisted by a pH gradient through liquid membranes. 18-Crown-6 in 1,2-dichloroethane has been used as a selective carrier. The effect of stirring rates at different volumes of the membrane, suggests a diffusional rate-limiting process of the amino acid transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00707999
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    Paper (German National Licenses)
    Fulltext
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