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  • 1
    Electronic Resource
    Electronic Resource
    Physical properties of matrices used for fast atom bombardment (1989)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 18 (1989), S. 492-497 
    Details
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Physical and chemical properties of common matrices are tabulated, with aims of facilitating rational matrix selection and providing input for fundamental studies of matrix-assisted ionization. The rationale for selecting tabulated properties is discussed.
    Additional Material: 10 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200180708
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  • 2
    Electronic Resource
    Electronic Resource
    Supercritical fluid extraction / capillary supercritical fluid chromatography / Fourier transform infrared microspectrometry of polycyclic aromatic compounds in a coal tar pitch (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 766-775 
    Details
    ISSN: 0935-6304
    Keywords: Supercritical fluid extraction, SFE ; Supercritical fluid chromatography, SFC ; Fourier transform infrared microspectrometry, FTIR ; Narrow-bore capillary column ; Polycyclic aromatic compounds, PAC ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The combination of supercritical fluid extraction, high resolution capillary supercritical fluid chromatography, and Fourier transform infrared microspectrometry is described for the separation and identification of polycyclic aromatic hydrocarbons in a coal tar pitch. The variable solvating power of the supercritical fluid was utilized to selectively fractionate the sample. The fluid extract was decompressed through a frit restrictor into the sample cavity of a cooled microvalve injector, where the analytes were deposited and concentrated for subsequent chromatographic analysis. Several of the analytes separated in the chromatograph were collected on a potassium bromide disc at a solvent elimination inter-face for subsequent infrared analysis involving the use of an infra-red microscope accessory. The spectra obtained show the power of this detection technique for distinguishing between isomers.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240111105
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  • 3
    Electronic Resource
    Electronic Resource
    Use of xenon as a mobile phase for on-line capillary supercritical fluid chromatography-fourier transform infrared spectrometry (1989)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 12 (1989), S. 300-302 
    Details
    ISSN: 0935-6304
    Keywords: SFC-FTIR ; Flow cell ; Stop-flow ; Xenon ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Xenon is investigated as a mobile phase for on-line capillary supercritical fluid chromatography-Fourier transform infrared spectrometry (SFC-FTIR). Polycyclic aromatic hydrocarbons, aromatic isocyanates, and epoxy acrylate oligomers are analyzed as examples to show that xenon has similar selectivities and solvating powe to CO2. Its optical transparency makes it ideal for IR detection. A stop flow system is constructed to increase the sensitivity of spectra measured from compounds which are weak IR absorbers.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240120512
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  • 4
    Electronic Resource
    Electronic Resource
    Electrospray micro liquid chromatography - Fourier transform infrared micro spectrometry (1992)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 15 (1992), S. 361-366 
    Details
    ISSN: 0935-6304
    Keywords: Micro liquid chromatography ; Electrospray nebulization ; Fourier transform infrared (FTIR) ; Micro spectroscopy ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Microcolumn liquid chromatography has been interfaced with infrared microspectrometry by means of a novel technique involving electrospray nebulization. The eluent from the LC column is subjected to a high positive potential relative to the surroundings and the electric field generated charges the surface of the emerging liquid causing it to disintegrate into charged droplets which are attracted to an earthed, infrared-transparent, zinc selenide deposition plate. Nitrogen sheath gas is used to evaporate the solvent in the droplets, and the separated components are deposited on the zinc selenide plate for subsequent analysis by means of a Fourier transform infrared microscope and spectrometer. Provided low flow rates (∼4 μl/min) are used, total elimination of the solvent is achieved and easily identifiable infrared spectra can be measured from less than 500 pg of sample (caffeine).
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240150602
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  • 5
    Electronic Resource
    Electronic Resource
    Isotope label scrambling in alkyl cations. A mechanistic proposal (1989)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 3 (1989), S. 289-292 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The observation of sharp limits to the chain lengths of alkyl cations derived by low energy collision-induced dissociation of isotopically labelled trimethyltetradecylammonium cations, as well as the selectively limited scrambling of its isotope label, has prompted the proposal of a new mechanistic model for alkyl cation fragmentation. The model invokes protonated cyclopropane intermediates which may reopen to branched structures, or fragment (if suitably substituted) to form smaller alkyl cations and neutral olefins. The model accounts completely for the absence of daughter ions with fewer than three or more than six carbon atoms, while its semi-quantitative application provides a reasonable match to the observed isotope scrambling.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290030904
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  • 6
    Electronic Resource
    Electronic Resource
    Xenon as a mobile phase in supercritical fluid chromatography (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 3 (1991), S. 337-347 
    Details
    ISSN: 1040-7685
    Keywords: supercritical fluid chromatography ; mobile phases ; xenon ; SFC-FTIR ; polynuclear aromatic hydrocarbons ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Supercritical xenon and CO2 are compared as solvents by means of solubilities (calculated by means of the Peng-Robinson equation of state) and chromatographic behavior for some polynuclear aromatic hydrocarbons; reasons for the apparent superiority of xenon are discussed. The advantages of the use of xenon as a mobile phase in coupled supercritical fluid chromatography-Fourier transform infrared spectrometry are evaluated from analyses of monomer and oligomer mixtures.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220030408
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  • 7
    Electronic Resource
    Electronic Resource
    Microcolumn supercritical fluid chromatography with on-line Fourier transform infrared detection (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 1 (1989), S. 101-109 
    Details
    ISSN: 1040-7685
    Keywords: capillary supercritical fluid chromatography ; Fourier transform infrared spectrometry ; flow cell ; ultraviolet curing inks and coatings ; carbon dioxide ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The combination of capillary supercritical fluid chromatography (SFC) and Fourier transform infrared spectrometry (FTIR) is demonstrated using a low-volume (0.8 μL) flow cell capable of withstanding high pressures. The design of the interface is presented, and its effect on peak shape and detector sensitivity is discussed. In order to optimize the system for use with 50-μ i.d. capillary columns, makeup fluid is added to the column effluent before it passes through the flow cell to a flame ionization detector (FID). Loss in chromatographic resolution caused by the cell's dead volume is therefore minimized, which is clearly demonstrated by the analysis of two ultraviolet curing coatings using carbon dioxide as a mobile phase. This application highlights the analytical power of the system for separating and identifying reactive monomers, oligomers, and photoinitiators in low- to medium-molecular-weight polymer systems.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220010210
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  • 8
    Electronic Resource
    Electronic Resource
    Stopped-flow FTIR detection in capillary supercritical fluid chromatography (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 2 (1990), S. 300-303 
    Details
    ISSN: 1040-7685
    Keywords: capillary supercritical fluid Chromatography ; Fourier transform infrared spectrometry ; flow cell ; stopped flow ; polymer additives ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A stopped-flow procedure for capillary supercritical fluid Chromatography with Fourier transform infrared detection is described. The flow of mobile phase is stopped so that the analyte peak is held under liquid conditions in the flow cell while FTIR scans are recorded. An increase in the IR spectrum signal-to-noise ratio is demonstrated during the analysis of a polymer additive.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220020608
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  • 9
    Electronic Resource
    Electronic Resource
    A quantitative method of sample loading for field desorption mass spectrometry (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1974), S. 358-362 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A quantitative method for loading nanogram samples onto field desorption emitter wires is described. Sample consumption is reduced and problems with emitter wettability are overcome by freezing microliter droplets onto the emitters. Using this technique, good spectral data are obtained from 10 to 50 ng of material. Field desorption sensitivity measurements are reported for neomycin B, adenosine and cholesterol. Evaluation of the nonquantitative dipping technique previously employed reveals poor and nonreproducible sample loading efficiency.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200010513
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  • 10
    Electronic Resource
    Electronic Resource
    Field desorption mass spectrometry in structural studies of polyene macrolide antibiotics: Isolation and early identification of a pentaene macrolide antibioticSee Ref. 1.Abbreviation: IPA=2-propanol. (1980)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1980), S. 93-98 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Isolation of a pentaene macrolide antibiotic (NSC-277813) from Streptomyces griseus (FCRC-21) fermentation broth is described. Using field desorption mass spectrometry and high resolution field desorption mass spectrometry on the intact and derivatized antibiotic and degradation products, the antibiotic was identified as fungichromin. The application of field desorption mass spectrometry in the identification of polyene antibiotics is discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200070302
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