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  • 1
    Electronic Resource
    Electronic Resource
    The low- temperature mechanical relaxation of elastin. II. The solvated protein (1978)
    New York : Wiley-Blackwell
    Biopolymers 17 (1978), S. 213-223 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The low-temperature dynamic mechanical relaxation of ox Ligamentum nuchae elastin, swollen with water and ethylene glycol at various swelling ratios, has been investigated by means of the Rheovibron DDV II viscoelastometer, at frequencies from 3.5 to 110 Hz. The peak location on the temperature scale, its intensity and activation energy have been studied as a function of solvent content and it has been found that the two solvents influence the dynamic mechanical behavior in a quite different way. A similar interaction of the solvent molecules with the backbone peptide groups is assumed for both solvents, and the differences in the mechanical spectra, which are more marked the higher the solvation degree, are explained in terms of the different size of the protein-solvent relaxing units.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1978.360170117
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  • 2
    Electronic Resource
    Electronic Resource
    Mass spectrometric approaches in structural characterization of cephalosporins (1989)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 18 (1989), S. 851-854 
    Details
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectrometric behaviour of five structurally different cephalosporins has been studied in detail by means of different ionization/desorption methods (electron impact, fast atom bombardment, desorption chemical ionization, laser-induced vaporization) and metastable ion studies (linked scans and mass-analysed ion kinetic energy spectrometry). The best results were obtained by fast atom bombardment mass spectrometry, leading to both molecular ions and fragment ions diagnostic for structural identification.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200181002
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of lacidipine, a new 1,4-dihydropyridine antihypertensive agent and three chemically related compounds by means of chemical ionization, mass spectrometry and collision-induced dissociation (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 27 (1992), S. 240-250 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chemical ionization of two 1,4-dihydropyridines, lacidipine and its Z-isomer, and their corresponding pyridines in three different reagent gases and the collision-induced dissociation (CID) of their respective mass-selected protonated molecular ions in the collision energy range 10-200 eV were performed on a multiple quadrupole instrument. The weakness of the Breasted acid NH4+ as a protonating agent is clearly manifested in one of the ammonia positive-ion chemical ionization (CI+) mass spectra which displays the addition ion, [M + NH4]+, as the favoured reaction channel. The stereochemistry of the precursor molecules, the exothermicity of the protonation process and the threshold of certain dissociation channels as a function of the collision energy are among the arguments invoked to explain some of the observed differences between the CI+ mass spectra and the CID data of the different isomers investigated. In an attempt to present a more comprehensive study, some high-performance liquid chromatographic retention times and resolutions are also given.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210270315
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  • 4
    Electronic Resource
    Electronic Resource
    The low-temperature mechanical relaxation of elastin. I. The dry protein (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 283-292 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The low-temperature relaxation of native ox Ligamentum nuchae elastin and of two purified elastin samples has been investigated in the dry state by means of the Rheovibron DDV II viscoelastometer, at the fixed frequencies of 3.5, 11, 35, and 110 Hz. Besides the glass transition at about 200°C, a relatively strong secondary loss-tangent peak, whose activation energy is about 13 kcal/mol, is found for all samples below room temperature. The peak maximum is at -71°C for the 3.5-Hz frequency. On the basis of its location, intensity, and width, it is attributed to a main-chain relaxation of the pure protein. When suitable reduced variables are used, the loss-tangent-temperature curves obtained at different frequencies can be satisfactorily superimposed to give a master curve. Comparison of the data with the prediction of a semiempirical viscoelastic model can also be considered satisfactory.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360150206
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  • 5
    Electronic Resource
    Electronic Resource
    Suitability of fast-ion bombardment mass spectrometry for the investigation of 1,4-dihydropyridine derivatives (1991)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 5 (1991), S. 493-498 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Positive/negative fast-ion bombardment (FIB+/FIB-, negative-ion chemical ionization (CI-) and positive-ion electron ionization (EI+)mass spectrometry are used to investigate a number of 1,4-dihydropyridine derivatives. The FIB+ mass spectra presented, acquired at fixed Cs+ ion-gun voltage as well as at different voltages ranging from 1-16 kV, display a close resemblance to their EI+ mass spectral counterparts. Comparison of the FIB- data with data acquired in ammonia CI- demonstrates that for the type of compound investigated in this work, the latter ionization technique yields a superior molecular anion signal and negligible fragmentation. Some of the FIB+ mass spectra presented display a number of unmistakeable qualitative differences which are tentatively attributed to the isomeric stereo-chemistry of the compounds investigated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290051102
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  • 6
    Electronic Resource
    Electronic Resource
    Investigation of some pentasubstituted 1,4-dihydropyridines by means of fast ion bombardment, chemical ionization and electron impact mass spectrometry (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 27 (1992), S. 724-729 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Positive fast ion bombardment, positive chemical ionization (CI+) and positive electron impact (EI) ionization mass spectrometry were used to investigate a number of relatively large and structurally related organic molecules. Some of the major dissociation pathways observed in the CH4-CI+ mass spectra are not present under NH3-CI+ conditions, but are obtained in the collision-induced dissociation (CID) spectrum of the 50 eV MH+ molecular ion, formed in the latter reaction. The resemblance between the EI mass spectra and their fast ion bombardment counterparts, the effect of changing the energy of the bombarding Cs+ ion beam over the range 2-16 keV and the different degrees of internal excitation of ions formed in different CI reagent gases are discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210270614
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  • 7
    Electronic Resource
    Electronic Resource
    Ether and ester glucuronic acid conjugates of lacidipine metabolites: Mass spectrometric differentiation using thermospray and particle beam techniques (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 27 (1992), S. 1261-1265 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Glucuronic acid conjugates of Lacidipine metabolites were analysed by high-performance liquid chromatog-raphy/mass spectrometry with different ionization techniques, viz. thermospray and chemical ionization with a particle beam interface. Analyses were performed on bile samples collected from dogs after oral administration of 14C-labelled Lacidipine. Phase II metabolites, originating from the conjugation with glucuronic acid of phase I metabolites containing free hydroxy or carboxylic functions, were isolated. Two types of glucuronides, with an ether or an ester bond, were characterized. They showed different mass Spectrometric behaviour owing to a specific interaction with the acetate in the mobile phase.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210271118
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