Bibliothek

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
  • 1
    Digitale Medien
    Digitale Medien
    Sequence-ion studies in peptides: The generation of C″ ions - part 2Dedicated to Professor J. L. Holmes to mark 15 successful years as an Editor of Organic Mass Spectrometry.For Part 1, see Ref. 5. (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 28 (1993), S. 1059-1063 
    Details
    ISSN: 0030-493X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The mechanism for the formation of Cx″-type ions in which x ≤ n - 2, from protonated peptides containing n amino acids, produced under conditions of fast atom bombardment and collisional activation, was investigated. Comparison of the tandem mass spectra of the [M + H]+ ions of two model peptides (VGSE and AAA) with those of their corresponding [Md + D]+ ions, in which all exchangeable hydrogens are replaced with deuterium, revealed that in the case of VGSE the hydrogen atom from the hydroxyl group in the serine residue and/or from the amide group of the adjacent amino acid must be involved in the migration process which leads to the formation of C2″-type ions. The second peptide (AAA) shows the exclusive transfer of the amide hydrogen atom in the formation of the C1″ ion. The mechanism differs from an earlier reported reaction channel which appeared to be applicable to the formation of Cn -1″-type ions. The most plausible neutral species which is eliminated in the formation process of the Cx″ ion from [M + H]+ is proposed on the basis of relative stability calculations.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/oms.1210281014
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Fast atom bombardment/collisional activation mass spectrometry of β-D-mannosyl-(1→4)-β-D-N-acetylglucosaminyl (1→N) urea and related compounds (1988)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 2 (1988), S. 95-97 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: A new compound, obtained during the isolation of oligosaccharides from the urine of two brothers affected with inherited β-mannosidase deficiency, has been investigated using fast atom bombardment ionization and MS/MS techniques. The compound could be characterized as an N-acetylglucosamine molecule linked to a hexose and a urea molecule.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290020508
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Letter to the editors (1991)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 20 (1991), S. 650-655 
    Details
    ISSN: 1052-9306
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200201011
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Rapid identification of specific mutations in the sequence of an enzyme variant produced by protein engineering using high-performance liquid chromatographic/fast atom bombardment mass spectrometric techniques (1994)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 23 (1994), S. 675-681 
    Details
    ISSN: 1052-9306
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Unknown, specific mutations in the sequence of an enzyme variant (a Bacillus subtilisin protease) produced by protein engineering were identified using High-performance Liquid Chromatographic/Fast Atom Bombardment Mass Spectrometric (HPLC/FAB MS) techniques. The variant and the highly homologous wild-type enzyme were treated with CNBr followed by tryptic digestion. The resulting peptides were analysed using HPLC/frit FAB MS. The peptides with molecular masses beyond the range of the HPLC/MS system under the chosen scanning conditions were collected using HPLC and subsequently analysed ‘off-line’ using static FAB MS. This procedure allowed the complete amino acid sequence determination of the variant protease using the known amino acid sequence of the wild-type enzyme as reference.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200231105
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    High-performance thin-layer chromatography/fast atom bombardment (tandem) mass spectrometry of Pseudomonas rhamnolipids (1994)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 23 (1994), S. 179-185 
    Details
    ISSN: 1052-9306
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Several rhamnolipid preparations from Pseudomonas strains were studied by thin-layer chromatography/fast atom bombardment (TLC/FAB) mass spectrometry and TLC/FAB tandem mass spectrometry (MS/MS). The preparations were separated with normal-phase (Silica 60) and reversed-phase (RP-8) chromatography. Silica 60 plates appeared to be very useful in the separation of rhamnolipids according to the number of monosaccharide residues present. Spectra which show characteristic fragment ions could be obtained from components of mixtures with a total sample size of less than 200 ng. Chromatography on RP-8 plates gave a good separation of the rhamnolipids based on the length of the fatty acid alkyl chain. MS/MS of the sodium cationized molecules gave information about the sequence of the building blocks. Particularly, heterogeneity in β-hydroxy fatty acid composition was determined for the principal as well as minor components present in natural rhamnolipid mixtures.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200230402
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    Fast atom bombardment mass spectrometry of sucrose monocaprate and sucrose monolaurate (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1993), S. 277-284 
    Details
    ISSN: 1052-9306
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Fast Atom Bombardment (FAB) ionization of sucrose monocaprate and sucrose monolaurate in the presence of Na+ ions shows the formation of both [M + Na]+ and [M - H]- ions. The [M + Na]+ ions undergo chargeremote fragmentations when collisionally activated at high translational energy. These charge-remote fragmentations are useful for the structural determination of the acylic part of the glycolipid. In the negative ion mode both sucrose esters yield anions which can be attributed to the saccharide and lipid components of these glycolipids. Structural characterization of the fatty acid can be achieved as the released carboxylate anions undergo charge-remote fragmentations that are consistent with the ion chemistry of [M - H]- anions from FAB-ionized free fatty acids.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200220503
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    The diagnostic value of the m/z 102 peak in the positive-ion fast-atom bombardment mass spectra of peptides (1995)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 845-850 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The mass spectrometric characteristics of a number of different m/z 102 ions, which might occur in the fast-atom bombardment mass spectra of peptides, appeared to be sufficiently different for an unequivocal structural assignment and they have successfully been applied in the structural analysis of an unknown. Special attention has been paid to the structure of m/z 102 ions from threonine-containing compounds. Attempts to generate m/z 102 product ions from peptides containing threonine at the N-terminus were not successful. From experiments with 18O-labelled threonine it was concluded that the side-chain hydroxyl group is exclusively involved in the water loss from protonated threonine. Based on ab initio calculations of feasible m/z 102 production structures, N-protonated dehydroamino-2-butyric acid from protonated threonine and peptides containing threonine at the C-terminus seems to be the most likely product-ion structure. Although relative stability calculations revealed that the threonine B1-type ion has the lowest heat of formation, it could also be concluded that a B1-type ion from threonine should be considered as an electrostatically bound ion/molecule complex, which will immediately dissociate into a threonine immonium ion (A1) and a carbon monoxide molecule. The energy requirement for this fragmentation reaction (B1→A1 + CO) is less than 7 kJ/mol without an energy barrier, which makes B1-type ions of threonine unlikely to exist in the gas phase.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290090925
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 8
    Digitale Medien
    Digitale Medien
    Fast atom bombardment of flavonols (1985)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1985), S. 596-601 
    Details
    ISSN: 1052-9306
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The positive ion fast atom bombardment (FAB) mass spectra of flavonols show reasonably abundant [M + H]+ ions. The protonated aglycone is the base peak in the spectra of all compounds investigated. The various protonated aglycones show structure-specific fragmentation reactions, which are more distinct in their metastable ion and collisional activation spectra. Discrimination between isomeric aglycones is possible using these characteristics. The number and size of the monosaccharides in the glycosides can be established. Their positional identity, however, cannot be derived from FAB spectra.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200121006
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 9
    Digitale Medien
    Digitale Medien
    Deriving structural information on peracetylated monosaccharides by applying different ionization methods (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 21 (1992), S. 331-340 
    Details
    ISSN: 1052-9306
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Mass spectra of peracetylated monosaccharides can be obtained by various ionization methods, including electron ionization, chemical ionization and fast atom bombardment. The structural information in the spectra of two relatively simple model compounds (acetyl 3,4-di-O-acetyl-D-digitoxose and acetyl 2,3,4-tri-O-acetyl-D-xylose) was compared. Additional information was obtained from the perdeuteroacetylated analogues and from daughter and precursor ion scans of selected ions. The chemical ionization spectra and the fast atom bombardment spectra are simple and very similar. The electron ionization spectra show far more fragmentations and contain more structural information, but are more difficult to interpret unambiguously.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200210703
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 10
    Digitale Medien
    Digitale Medien
    Analysis of bovine β-casein tryptic digest by continuous-flow fast-atom bombardment mass spectrometry (1991)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 5 (1991), S. 192-195 
    Details
    ISSN: 0951-4198
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: Liquid chromatography/fast-atom bombardment mass spectrometry was used to partially confirm the amino-acid sequence of the protein, β-casein. The study demonstrates that the technique is capable of the rapid and accurate identification of peptide fragments from tryptic digests and that chromatograrphic integrity is maintained during the analysis. The power of the technique derives from the ability to determine both the retention time and the molecular weight of the eluting components. Each of the components yields a prominent pseudo-molecular ion (MH+), the majority exhibiting sufficient fragmentation to confirm their structure unambiguously.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/rcm.1290050410
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...