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  • Analytical Chemistry and Spectroscopy  (6)
  • Relative growth rate  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Differences in relative growth rate in 11 grasses correlate with differences in chemical composition as determined by pyrolysis mass spectrometry (1992)
    Springer
    Oecologia 89 (1992), S. 567-573 
    Details
    ISSN: 1432-1939
    Keywords: Cell components ; Grasses ; Interspecific variation ; Pyrolysis mass spectrometry ; Relative growth rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Eleven grass species varying in potential relative growth rate (RGR) were investigated for differences in chemical composition by pyrolysis mass spectrometry. The spectral data revealed correlations between RGR and the relative composition of several biopolymers. Species with a low potential RGR contained relatively more cell wall material such as lignin, hemicellulose, cellulose, polysaccharide-bound ferulic acid and hydroxyproline-rich protein, whereas species with a high potential RGR showed relatively more cytoplasmic elements such as protein (other than those incorporated in cell walls) and sterols.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317165
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  • 2
    Electronic Resource
    Electronic Resource
    Fast atom bombardment (tandem) mass spectrometric analysis of intact polar ether lipids extractable from the extremely halophilic archaebacterium Halobacterium cutirubrum (1989)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 18 (1989), S. 96-105 
    Details
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fast atom bombardment (FAB) mass spectrometric analyses of the three major polar ether lipids extracted from Halobacterium cutirubrum produced simple positive and negative ion mass spectra which contained ions with masses which corresponded to cationized or deprotonated lipid molecules. Structural information was obtained on individual components of polar lipid mixtures by discrete selection of ion masses when the instrument was operated in the tandem mass spectrometric mode. Tandem mass spectra contained abundant ions at masses which indicated collision-induced cleavage of phosphate (di)ester, sulphate ester or glycosidic linkages. This study showed that FAB (tandem) mass spectrometry can be used to analyse intact polar ether lipids present at microgram concentrations in crude lipid mixtures and these analyses can indicate the presence of structural features (i.e. O-methylation and the presence of cyclic isoprenoidyl chains) which are difficult to determine with other analytical methods.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200180203
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  • 3
    Electronic Resource
    Electronic Resource
    A simple approach to the dynamic headspace analysis of volatile flavours using a gas chromatograph/photoionization mass spectrometer (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 16 (1988), S. 373-375 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dynamic headspace analysis was performed on several samples of foodstuffs in a special gas chromatographic injection system which is normally used for Curie-point pyrolysis analysis. Photoionization was used in the gas chromatographic/mass spectrometric instrument as a reproducible low-energy ionization method. Mass spectral accumulation of the data yields fingerprints of the samples which are amenable to computer-assisted statistical data analysis.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200160173
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  • 4
    Electronic Resource
    Electronic Resource
    Endgroup analysis of polyethylene glycol polymers by matrix-assisted laser desorption/ionization Fourier-transform ion cyclotron resonance mass spectrometryPresented at the 13th Informal Meeting on Mass Spectrometry, Budapest, 8-10 May 1995. (1995)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 957-962 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Fourier-transform ion cyclotron resonance mass spectrometry (FTICR-MS) by external injection of matrix-assisted laser desorbed and ionized (MALDI) polymers offers good possibilities for characterization of low molecular weight homopolymers (MW range up to 10 kDa). The molecular masses of the molecular weight distribution (MWD) components of underivatized and derivatized (dimethyl, dipropyl, dibutyl and diacetyl) polyethylene giycol (PEG) 1000 and 4000 were measured by MALDI-FTICR-MS. These measurements have been performed using a commercial FTICR spectrometer with a home-built external ion source. MALDI of the samples with a 2,5-dihydroxybenzoic acid matrix in a 1000: 1 matrix-to-analyte molar ratio produces sodiated molecules in a sufficient yield to trap the ions in the ICR cell. The masses of the molecular weight distribution of PEG components were measured in broad-band mode with a mass accuracy of 〈 5 ppm in the mass range around 1000 u and within 40 ppm accuracy around 4000 u. From these measurements, the endgroup mass of the polymer was determined by correlation of the measured component mass with the degree of polymerization. The masses of the PEG endgroups have been determined within a deviation of 3-10 millimass units for the PEG1000 derivatives and 10-100 millimass units for the PEG4000 derivatives, thus confirming the identity of the distal parts of the model compounds.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290091018
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  • 5
    Electronic Resource
    Electronic Resource
    Loss of oligomer information in pyrolysis-desorption/chemical-ionization mass spectrometry of amylose, due to the influence of potassium hydroxide (1989)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 3 (1989), S. 238-240 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Pyrolysis-desorption/chemical-ionisation mass spectrometry (PyD/CIMS), using ammonia as ionization gas, was employed to investigate the influence of potassium hydroxide on the pyrolytic behaviour of glucans. The mass spectrum of native amylose, a 1 → 4 linked α-D-glucan, revealed an ion series pointing to desorption of intact 1,6-anhydro-oligosaccharides. Ions indicating oligomers up to the nonamer were observed. Addition of trace amounts of potassium hydroxide to amylose resulted in reduction in the size of the 1,6-anhydro-oligosaccharide ions and a simultaneous increase of ions resulting from ring rearrangements. Larger amounts of potassium hydroxide led to a complete loss of mass spectral information at the oligomer level.Similar mass spectrometric distributions in the PyD/CIMS data of a potassium hydroxide extracted tobacco fraction clearly reveal that alkali remnants must be present in this sample, which severly reduce the mass spectrometric information from polysaccharide oligomers. It is important to evaluate the role of inorganics on the thermal activation and subsequent fragmentation of biopolymers in PyD/CIMS experiments.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290030709
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  • 6
    Electronic Resource
    Electronic Resource
    Ammonia chemical ionization mass spectrometry of substituted phenylpropanoids and phenylalkyl phenyl ethers (1995)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 541-548 
    Details
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The ammonia chemical ionization (NH3/CI) spectra of phenylpropanoids and substituted phenylalkyl phenyl ethers containing α-hydroxy or α-carbonyl functional groups are discussed. Fragmentation reactions which occur in the temperature range 180-450°C are examined to model pyrolysis mass spectrometric experiments of lignin. Hydroxycinnamyl alcohols and α-hydroxy phenylalkyl phenyl ethers show abundant [M + H - H2O]+ elimination ions and to a lesser extent [M + NH4 - H2O]+ substitution ions while hydroxycinnamic acids and α-carbonyl phenylalkyl phenyl ethers show predominantly [M + H]+ and [M + NH4]+ ions. The interpretation of functional group information is facilitated by using trideuterioammonia (ND3) and [15N] ammonia (15NH3) as reagent gases. Labile hydrogens undergo essentially complete exchange upon ND3/CI and the number of hydroxyl functional groups is readily determined by comparison of the [M + NH4]+ and [M - nH + nD + ND4]+ adduct ions. Incomplete H—D exchange is observed for enolizable and aromatic protons.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jms.1190300404
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  • 7
    Electronic Resource
    Electronic Resource
    The analytical pyrolysis of carbohydrates. 2 - differentiation of homopolyhexoses according to their linkage type, by pyrolysis-mass spectrometry and pyrolysis-gas chromatography/mass spectrometry (1984)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1984), S. 486-492 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Curiepoint pyrolysis (Py)-mass spectrometry (14 eV electron impact) in various modes of operation and Curiepoint pyrolysis-gas chromatograpy/mass spectrometry (Py-GC/MS) afforded discrimination between homopolyhexoses of different glycosidic linkage type and configuration: (1 → 2)-β-, (1 → 3)-β-, (1 → 4)-α-, (1 → 4)-β-, (1 → 6)-α, (1 → 6)-β-glucan and (1 → 2)-α-mannan. Pyrolysis-mass spectrometry in multichannel averaging mode, combined with discriminant analysis data processing, revealed significant discrimination between all polyhexoses, except for the (1→6) linked polymers. By using preheated telescopic glass tube sample holders, additional specificity of the pyrolysis-mass spectral fingerprint for the (1 → 3) linked carbohydrate was obtained. Pyrolysis-mass spectrometry in time-resolved mode yielded ion profiles, especially characteristic for the (1 → 3)-β-glucan. Py-GC/MS was an additional discriminating dimension (retention time), providing structural information about the pyrolysate constituents, in particular concerning the anhydrohexoses.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200110910
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