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  • 1975-1979  (3)
  • 1965-1969  (2)
  • 1890-1899
  • 1810-1819
  • 1975  (3)
  • 1966  (2)
  • 1890
  • Analytical methods
  • 1
    Electronic Resource
    Electronic Resource
    Detection of Fragment Genesis in the Mass Spectrometer: DADI Mass Spectrometry as an Aid in the Structure Analysis of Organic Compounds (1975)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 14 (1975), S. 679-688 
    Details
    ISSN: 0570-0833
    Keywords: Fragment genesis ; Mass spectrometry ; Analytical methods ; Mass spectrometry ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: “Direct Analysis of Daughter Ions” (DADI) can be carried out with commercial mass spectrometers embodying the Nier-Johnson inverse geometry. DADI measurements permit experimental detection of the consecutive formation of molecule fragments (fragment genesis). Knowledge of fragment genesis enables the chemist to clarify the fragmentation processes of molecule-ions and provides information on the structure of fragments formed in the mass spectrometer. In combination with classical mass spectrometry such information makes it easier to determine the structure of compounds, to analyze mixtures, to determine the sequence in periodically constructed molecules, for example oligopeptides, and to study rearrangement reactions occurring in the mass spectrometer.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197506791
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Field Desorption Mass Spectrometry (1975)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 14 (1975), S. 403-415 
    Details
    ISSN: 0570-0833
    Keywords: Mass spectrometry ; Analytical methods ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Field desorption (FD) enables mass-spectrometric investigation of large organic molecules without their vaporization. The present state of our theoretical understanding of the ionization of these molecules in the adsorbed state on organic emitters is described. The special problems of the technique and prospective developments in the apparatus for future analytical problems are outlined. The present progress report concentrates on analytical studies of biochemical model compounds and degradation products from environmental chemicals and drugs. The method is particularly suitable for the detection and identification of submicrogram quantities of underivatized polar substances present in complex mixtures or pre-purified extracts from biological materials.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197504031
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Organic Compounds in Nature: Limits of Our KnowledgeWoods Hole Oceanographic Institution Contribution Number 3443. (1975)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 14 (1975), S. 507-514 
    Details
    ISSN: 0570-0833
    Keywords: Natural products ; Sediments ; Analytical methods ; Geochemistry ; Soils ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Current geochemical and environmental research reveals the presence in soils and sediments of extremely complex assemblages of organic compounds. Their recognition has long been delayed by both conceptual and analytical limitations. Even today the best techniques cannot fully resolve these mixtures into their individual components. Yet, the knowledge of their structures and abundances is needed in geochemistry, and especially for the assessment of their potential biological effect and ecological impact. The classical “natural products approach” is unlikely to provide this information; therefore, I foresee the need for a more realistic assessment of nature, that acknowledges the limitations of our present analytical powers and of our knowledge.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197505071
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    An Apparatus for Titrations in Liquid AmmoniaTo Prof. Dr. F. Patat on the occasion of his 60th birthday (1966)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 5 (1966), S. 554-557 
    Details
    ISSN: 0570-0833
    Keywords: Titration ; Liquid ammonia ; Analytical methods ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An apparatus for titrations in liquid ammonia is described. The titrations can be carried out in the absence of air, and the utility of the apparatus is demonstrated for a number of conductometric and potentiometric titrations.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196605541
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Electron Pyrolysis, a New Method of Organic Microanalysis (1966)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 5 (1966), S. 751-759 
    Details
    ISSN: 0570-0833
    Keywords: Pyrolysis ; Analytical methods ; Electron pyrolysis ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organic compounds incubated with tritiated water of specific activity 5 Ci/ml are specifically fragmented. The β-active fragments can be detected in very small quantities by chromatographic separation. Chemical identification of these fragments provides information about the original compounds, as has been shown by experiments with amino acids, esters, lactones, amides, quinones, terpenes, nitrogen-sulfur heterocycles, and natural products.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196607511
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    Paper (German National Licenses)
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