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  • 1
    Electronic Resource
    Electronic Resource
    Glass capillary gas chromatography of amino acid enantiomers (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 411-415 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Enantiomer amino acids separated on chirally functionalized polysiloxane phase ; McReynolds constants of chiral phase given ; HCl gas pretreatment, colloidal silicic acid deposition best wall preparation ; Racemisation tested ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Glass capillaries coated with Chirasil-Val, a chirally functionalised polysiloxane, are capable in principle of resolving all protein amino-acid enantiomers in a single run and within a short analysis time, thus allowing for example the quantitative amino acid determination by enantiomer labelling. The elution characteristics of the individual amino acids however are also dependent upon the chemical nature of the capillary wall surface, and a surface pretreatment is found to be necessary if all protein amino acids are to be analysed. Of the various methods of pretreatment tested, etching of borosilicate glass with gaseous HCl followed by deposition of colloidal silicic acid is considered to be the most suitable.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020708
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chirale Polysiloxane zur Trennung von optischen AntipodenDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft unterstützt. (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 90 (1978), S. 396-398 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19780900525
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Racemisierungsstudien an cysteinhaltigen Peptiden (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 3711-3718 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies upon the Racemisation of Cysteine-containing PeptidesThe thiosulfate derivatives of natural bovine insulin-A- and insulin-B chains and of several S-tritylcysteine peptides were hydrolysed and the degree of racemisation of the resulting amino acids was investigated by means of gas chromatography. It was found that those amino acids which are N-terminally linked to cysteine undergo racemisation to a high degree. GC-MS and UV spectroscopic investigations indicate that the racemisation occurs during hydrolysis and that it proceeds via a thiazoline derivative c. The method developed is generally applicable to the differentiation between D-enantiomers originally present in the sample and that formed by racemisation during hydrolysis.
    Notes: Die Thiosulfat-Derivate natürlicher Rinderinsulin-A- und Rinderinsulin-B-Ketten sowie einige S-Trityl-Cystein-Peptide wurden hydrolysiert und die Aminosäuren gaschromatographisch auf Racemisierung untersucht. Dabei zeigte sich, daß die jeweils an Cystein N-ständig gebundenen Aminosäuren ungewöhnlich hohe D-Anteile aufweisen. GC/MS-Experimente und UV-spektroskopische Untersuchungen weisen darauf hin, daß die Racemisierung unter den Hydrolysebedingungen erfolgt und über ein Thiazolin-Derivat c verläuft. Damit wurde eine Methode zur Unterscheidung der bei der Hydrolyse auftretenden D-Anteile von ursprünglich vorhandenen D-Enantiomeren-Anteilen erarbeitet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781111115
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  • 4
    Electronic Resource
    Electronic Resource
    Chiral Polysiloxanes for Resolution of Optical AntipodesThis work was supported by the Deutsche Forschungsgemeinschaft. (1978)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 17 (1978), S. 363-365 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197803631
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    Paper (German National Licenses)
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