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  • 1
    Electronic Resource
    Electronic Resource
    Electrospray vs. matrix-assisted laser desorption/ionization. 1. Some examples in the protein field (1994)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 29 (1994), S. 526-532 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several proteins in the relative molecular mass (RMM) range 1150-29000 are examined by means of both positive electrospray and matrix-assisted laser desorption/ionization mass spectrometry. Accuracy of the measured RMMs, resolution and overall sensitivity are discussed. The presence of more than one component in a number of the investigated compounds permitted the assessment of both desorption methods for the analysis of mixtures. Solvent-induced conformational changes are linked to charge-state distribution shifts observed in some positive electrospray mass spectra.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210291003
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  • 2
    Electronic Resource
    Electronic Resource
    Letter to the Editor (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 287-288 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290080312
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of crudes of synthesis of [Leu31, Pro34]-neuropeptide Y by capillary zone electrophoresis/mass spectrometry (1995)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 1386-1390 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: [Leu31, Pro34]-Neuropeptide Y is a thirty-six amino-acid peptide which has a measured relative molecular mass of 4222. Solid-phase synthesis of this peptide resulted in complex crudes of synthesis which were examined by capillary zone electrophoresis (CZE)/electrospray ionization mass spectrometry (ES-MS). The separation efficiency of CZE combined with the mass specificity of mass spectrometry yielded rapid and reliable information on the target peptide and a number of associated side products, which were mainly acetylated peptide sequences having relative molecular masses in the range 2240-4101. Such incomplete or, as they are commonly called, difficult sequences are provoked by problems of swelling and aggregation of the growing peptide chains in the course of synthesis. The use of mass spectrometry is indispensable for obtaining reliable information on the inevitable side products. Initial tuning of the ion source and optimization of the coupling between the CZE system and the mass spectrometer were achieved by performing a number of measurements pertaining to artificially made mixtures of commercial neuropeptides.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290091412
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  • 4
    Electronic Resource
    Electronic Resource
    Capillary zone electrophoresis/electrospray ionization mass spectrométry for the characterization of drugs of forensic interest (1995)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 1487-1491 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Solutions containing between six and thirteen drug substances of forensic interest have been examined by capillary zone electrophoresis/electrospray mass spectrometry (CZE/ES-MS). The effects of citrate buffer concentration and its content of organic modifiers on the migration time, resolution and migration order of the various components were assessed. Performing CZE/ES-MS in full-scan mode at elevated cone (skimmer) voltage allowed differentiation between nalorphine and thebaine which have isomeric structures.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290091505
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  • 5
    Electronic Resource
    Electronic Resource
    Capillary zone electrophoresis/mass spectrometry: Analytical need or an option? (1995)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 1325-1327 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290091320
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  • 6
    Electronic Resource
    Electronic Resource
    Investigation of ruthenium (II) and iron (II) tris-bipyridyl complexes by means of 10-30 keV Cs+ ion bombardment and collision-induced dissociation (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 706-710 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: [Ru(bpy)3(X)2] and [Fe(bpy)3(X)2] complex salts (bpy=2,2′bipyridine; X = ClO4-, PF6-, Cl-) were investigated by means of Cs+ fast-ion bombardment and mass-selected collision-induced dissociation (CID). A number of dissociation channels which can be attributed to the loss of intact counterions, bpy neutral ligands and to the insertion of formal O2-, fluoride or chloride from the counterions ClO4-, PF6-, Cl- are evident in both the fast-ion bombardment and CID spectra. Formation of doubly charged intact cations is also observed for all the compounds investigated. The relative intensities of the major desorbed ions are monitored as a function of the Cs+ kinetic energy in the range 10-30 keV.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290080909
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  • 7
    Electronic Resource
    Electronic Resource
    Collision-induced dissociation of some protonated peptides with and without mass selection (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 274-279 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Collision-induced dissociation (CID) of several protonated peptides formed by positive-ion electrospray (ES+) and by Cs+ fast-ion bombardment are reported. The CID spectra of ions formed by the first ionization method were effected at elevated extraction cone voltages within the ion source of a single quadrupole instrument, while linked-fields-scan measurements at constant B/E of ions formed by the latter technique were performed within the collision cell of a trisector instrument. For molecular masses below 1000 Da, the two sets of spectra yielded identical sequencing information; however, for higher molecular masses the similarity was less evident. This divergence between the two sets of measurements is partially attributed to dominant doubly charged ions and less efficient dissociation of sodium adduct ions at elevated cone voltages.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290080310
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  • 8
    Electronic Resource
    Electronic Resource
    Investigation of complexes between some glycopeptide antibiotics and bacterial cell-wall analogues by electrospray- and capillary zone electrophoresis/electrospray-mass spectrometry (1995)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 883-887 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Complexation in aqueous solutions between vancomycin, ristocetin A, teicoplanin and two bacterial cell-wall analogues, Ac2-L-Lys-D-Ala-D-Ala (tripeptide) and Ac-D-Ala-D-Ala (dipeptide) has been examined by positiveion electrospray mass spectrometry (ES-MS) and capillary zone electrophoresis (CZE)/ES-MS. The ES-MS data demonstrate that as well as complexes between monomeric antibiotics and either peptide, the investigated solutions contained complexes ranging from the simple homodimer of the antibiotic to a more complex association giving ions of the type [2(antibiotic)+3(tripeptide)+3H]3+. The same data also demonstrate that the homodimers of the investigated antibiotics are significantly suppressed in the presence of the tripeptide. The use of CZE/ES-MS made it evident that the complexes between the antibiotic and the tripeptide were present in the solution prior to their introduction into the ion source. The two sets of data are compared with existing UV difference spectroscopy and nuclear magnetic resonance data on complexation and dimerization.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290091004
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of target identity and collision energy on the fragmentation of some mass-selected protonated neuropeptides (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 989-993 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A number of protonated neuropetides formed by 10 keV Cs+ ion bombardment are mass selected and their collision-induced dissociations (CID) with helium, argon, xenon and isobutane are monitored using a collision energy of 200 eV. Data obtained by fixing the collision gas and using translational energies in the range 50-250 eV are also presented. The present data imply that optimzation of the CID spectra presented can be achieved through a judicious choice of both the target gas and the translational energy of the mass-selected ion. The combined effect of the two experimental parameters on the relative abundances of the major sequence ions and on the loss of side-chain moieties is discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290071105
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  • 10
    Electronic Resource
    Electronic Resource
    Positive-ion mass spectra and collision-induced dissociation of some 2,3-didehydro amino acids (1990)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 25 (1990), S. 540-549 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The positive-ion mass spectra of a number of didehydro amino acids, ionized by electron impact and/or thermospray, and collision-induced dissociation spectra taken at collision energies of a few electron volts and keV have been performed on multiple quadrupole and reversed geometry sector instruments. Observed differences in the mass spectra and in the fragmentation patterns are explained in terms of different isomeric structures, different internal excitation energies and different ion transit times between the ion source and the collision cell. Molecular ions of unhydrated amino acids are efficiently formed both by electron impact and thermospray, whilst molecular ions of the hydrated compounds are formed more efficiently by the latter technique. The present investigation demonstrates that the use of different ionization techniques combined with mass spectrometry/mass spectrometry measurements at different collision energies yields a wealth of information relevant to structural characterization of this important class of molecules.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210251010
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