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  • Chemistry  (14)
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  • 1
    Electronic Resource
    Electronic Resource
    A bibliography of combined liquid chromatography mass spectrometry (1983)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 10 (1983), S. 237-252 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A compilation of reference to the development and application of the dynamic combination of liquid chromatography and mass spectrometry is presented. Additionally, author and subject indices have been complied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200100402
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  • 2
    Electronic Resource
    Electronic Resource
    The negative ion mass spectra of selected nucleosides (1983)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 10 (1983), S. 269-275 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Negative ion mass spectra of several free nucleosides as well as their trifluoroacetyl, trimethylsilyl, and 2′-o-nitrobenzyl derivatives are reported. A low ion source pressure is used so that the processes of collisional stabilization and ion/molecule reactions often associated with negative ion chemical ionization do not occur. The utility of such spectra for identification of these and similar nucleosides which may be present as unknowns is discussed. Details of modifications for acquiring negative ion mass spectra using an LKB-9000S mass spectrometer are given.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200100407
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  • 3
    Electronic Resource
    Electronic Resource
    Mass sectrometric study of methylene cross-linked derivatives of adenine and adenosine (1983)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 10 (1983), S. 665-670 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass spectra of model methylene cross-linked bases and nucleosides have been studied to provide a more complete understanding of their electron ionization mass spectra for characterization of chemically modified products isolated from RNA or DNA. Four adenine and four adenosine derivatives were prepared having (CH2)n cross links between N6 groups where n = 1-4. Principal fragmentation processes are associated with homolytic cleavage of the methylene chain, often with olefin ion formation by a process associated with the presence of both bases. The fragment ions formed provide a clear means of differentiating base-base linkages from base-sugar or sugar-sugar linkages.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200101209
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  • 4
    Electronic Resource
    Electronic Resource
    Origin of nitrogen in the biosynthesis of carbamoylpolyoxamic acid (1978)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1978), S. 89-90 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The biosynthetic origin of the carbamoylpolyoxamic sidechain of the polyoxin nucleoside peptide antibiotics was studied using 15N labeled α-amino-S-hydroxyvaleric acid as precursor. Gas chromatography mass spectrometry of polyoxamic acid isolated from culture filtrates of Streptomyces cacaoi var. asoensis showed incorporation of the nitrogen atom of α-amino-S-hydroxyvaleric acid into carbamoylpolyoxamic acid with an isotopic dilution factor of 23, thus establishing the intermediacy of α-amino-S-hydroxyvaleric acid and determination of the full biosynthetic pathway.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200050118
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  • 5
    Electronic Resource
    Electronic Resource
    Electron impact-induced rearrangement of trimethylsilyl groups in long chain compoundsPresented at the 16th Annual Conference on Mass Spectrometry and Allied Topics, ASTM Committee E-14, pittsburgh, Pennsylvania, May, 1968. (1968)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 669-685 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass spectra of trimethylsilyl (TMS) derivatives of long chain dicarboxylic acids, hydroxy acids, cyano acids, and terminal diols, dithiols and diamines have been examined. A number of fragmentation pathways involving rearrangement of partial or intact TMS groups between the termini or remote points in the chain have been determined, using deuterium and carbon-13 labeling, and high resolution mass spectrometry. Knowledge of the occurrence of functional group migrations of this type is essential to the correct interpretation of mass spectra of TMS derivatives, which are now in wide use in mass spectrometry and gas chromatography. These data in addition provide further evidence for the general ability of remote functional groups to interact, by winding or coiling of long chains. A number of interesting doubly-charged ions are reported, in which the charges are reported, in which the charges are located at opposite ends of long chains, and for which no singly-charged counterparts are observed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210010508
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  • 6
    Electronic Resource
    Electronic Resource
    Chemical ionization mass spectrometry using ammonia reagent gas. Selective protonation of conjugated ketones (1972)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 6 (1972), S. 939-940 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies using ammonia as a selective reagent gas in chemical ionization mass spectrometry were extended to conjugated ketones. Their proton affinities were in the range of most nitrogen-containing compounds (〉 207 ± 3 kcal/mole), thereby permitting proton transfer from [NH4]+-, leading to well stabilized protonated molecular ions as the most abundant ion products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210060815
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  • 7
    Electronic Resource
    Electronic Resource
    Skeletal rearrangement of allyl acetates after protonation by chemical ionizationPresented in part at the American Society for Mass Spectrometry, 21st Annual Conference on Mass Spectrometry and Allied Topics, San Francisco, California, May 1973. (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 9 (1974), S. 491-497 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the methane chemical ionization mass spectra of allyl phenylacetate and allyl phenoxyacetate the major reaction paths (〉40%σ) involve skeletal rearrangements, which have no analogy in the corresponding, simpler electron-impact spectra. Substituent and deuterium labeling studies suggest a mechanism involving intramolecular substitution of the phenyl ring by the allyl group. Abstraction of hydrogen from the ortho position of the phenyl ring or from the rearranged allyl group is followed by expulsion of water and carbon monoxide.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210090506
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  • 8
    Electronic Resource
    Electronic Resource
    Interpretation of mass spectra. Fred W. McLafferty. W. A. Benjamin Inc., New York, 1967. 229 pp. + xvii $9.00, paperback $4.95 (1969)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 2 (1969), S. 335-335 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210020313
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  • 9
    Electronic Resource
    Electronic Resource
    Fragmentations de Molecules Aliphatiques Bifonctionnelles: Methoxyesters (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 399-401 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Some of the observed fragmentation reactions of long-chain aliphatic methoxyesters necessitate the interaction of both functional groups, even when these are located far apart: both alcohol eliminations from the ion formed by α-cleavage to the ether function which contains the ester group are highly specific: they involve a hydrogen atom in the position adjacent to the methoxyl-bearing carbon.
    Notes: Certaines des fragmentations des méthoxyesters aliphatiques à longue chaíne nécessitent l'interation des deux fonctions: les deux éliminations d'alcool que subit l'ion par rupture en α de la fanction éther et comprenant le groupe ester, sont trés spécifiques: elles mettent en cause un atome d'hydrogéne en position adjacente au carbone qui porte le groupe méthoxyle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030315
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  • 10
    Electronic Resource
    Electronic Resource
    Fractional mass values of large molecules (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1987), S. 251-253 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From the standpoint of relative molecular mass (RMM) determination by mass spectrometry, the average relative molecular masses of organic molecules in the range over 2000 daltons are significantly influenced both by the fractional masses of the constituent elements and by natural variations in isotopic abundance. Differences between monoisotopic RMM and relative atomic mass (RAM) based RMM tend characteristically to differ between major classes of biomolecules primarily because of molar carbon content, the difference between polypeptides and nucleic acids being about 4 daltons at Mr = 25 000. Considering terrestrial sources alone, variations in the isotopic abundance of carbon lead to differences of about 10-25 ppm in average molecular mass, which is significant with respect to present mass measurement capability in the region up to several thousand daltons. Comments are made concerning the calculation of average RMM values horn isotopic probability profiles versus those from RAMs.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210220505
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