ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (2,281)
  • Articles: DFG German National Licenses  (2,281)
  • Analytical Chemistry and Spectroscopy  (2,281)
  • 1990-1994  (2,281)
  • Physics  (2,281)
Collection
  • Articles  (2,281)
Source
  • Articles: DFG German National Licenses  (2,281)
Keywords
Publisher
Years
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Collision-activated dissociation studies of alkylamines formed from copper-induced dealkylation of N-alkylporphyrins (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 406-409 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A low-energy (5-450 eV) collision-activated dissociation (CAD) study of a series of aliphatic amines revealed that at collision energies above 200 eV, charge-site-initiated fragmentation occurs. The resulting fragment ions can be utilized in the characterization of alkyl substituents of di- and trisubstituted aliphatic amines. In the presence of Cu2+ and a suitable nucleophile, such as n-dodecylamine, N-alkyl protoporphyrins dealkylate to afford copper protoporphyrin and an alkyl-dodecylamine adduct. A CAD study of a number of alkyl-dodecylamine adducts derived from the copper-induced dealkylation of synthetic N-alkyl protoporphyrins, using charge-site-initiated fragment ions, showed that the alkyl group was trapped by the nucleophilic amine present. Subsequently this method was used to identify the alkyl group of a biologically derived N-alkyl protoporphyrin.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290041013
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The analysis of smokestack samples for dioxins by gas chromatography/mass spectrometry and gas chromatography/tandem mass spectrometry (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 418-420 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A CONCEPT 1 SQ hybrid mass spectrometer has been used to show the potential of high resolution mass spectrometry and hybrid tandem mass spectrometry (MS/MS) for dioxin analysis. The usual method chosen for gas chromatography/mass spectrometry (GC/MS) determination of polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) is selected-ion monitoring (SIM) at high resolution, the high resolution imparting a degree of specificity to the analysis. An alternative technique is to use low resolution (1000) gas chromatography/tandem mass spectrometry on a hybrid mass spectrometer, where the specificity of MS/MS is utilized. Data are presented illustrating the potential of both techniques from a single instrument, the CONCEPT 1 SQ.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290041016
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Reproducing daughter-ion spectra using the transmission oscillation properties of quadrupole collision cells (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 421-425 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The transmission oscillation properties of parent ions through an RF-only quadrupole are investigated as a function of collision energy, radicfrequency of the quadrupole, and type and pressure of target gas. It is shown that small variations of collision energy can result in substantial differences in daughter-ion spectra obtained from the same parent ion. Since absolute values of collision energy are difficult to determine, reproducible daughter-ion spectra are problematical to acquire.In this work we show that reproduction of daughter-ion spectra, using the transmission properties of the collision cell, is possible. The characteristics of an RF-only quadrupole (Q*) are such that the parent ion intensity at the second detector varies as a function of collision energy and displays sinusoidal properties. By using the nodes and anti-nodes of the parent-ion transmission it is possible to achieve reproducible daughter-ion spectra of a wide range of biopolymers. The tuning of Q* is mass-dependent and not compound-dependent. Hence it is possible to optimize and tune Q* using an isobaric (or almost) standard such as one of the ions of perfluorotri-n-butylamine (electron ionization) or a glycerol cluster ion (fast-atom bombardment mass spectrometry) before subjecting valuable sample to tandem mass spectrometry.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290041017
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Fast-atom bombardment mass spectrometry and fast-atom bombardment tandem mass spectrometry of some monosaccharide oximes (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 432-435 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The oximes of monosaccharides have not been well characterized by mass spectrometry. Conventional electron ionization (EI) experiments have supported the structures of these compounds but the data produced are usually equivocal (Finch and Merchant, JCS Perkin 1, 1682 (1975)). The application of fast-atom bombardment mass spectrometry to monosaccharide oximes gives molecular weight information. However, little fragmentation is observed and it is not possible to distinguish between stereoisomers. Using fast-atom bombardment tandem mass spectrometry experiments, we have produced daughter-ion spectra which are sufficiently different to enable us to distinguish between the stereoisomers of the oximes of monosaccharides.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290041019
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    A fast-atom bombardment tandem mass spectrometry screening procedure for the presence of involatile sulphonated dyestuff intermediates (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 436-439 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The introduction of more rigorous regulations aimed at controlling the use of sulphonated dyestuffs and dyestuff intermediates has pointed to the need for screening methods for the presence of these involatile compounds. Although much work has been caried out recently on the mass spectrometric behaviour of these compounds, it has been concerned principally with the production of molecular weight information using novel ionization methods rather than with any attempt to obtain structurally diagnostic fragment ions. In this mass spectrometric investigation of a range of naphthalene sulphonic acid salts, positive-ion and negative-ion fast-atom bombardment (FAB) mass spectra have been obtained and FAB-tandem mass spectrometry (MS/MS) has been used to acquire spectra (daugher-ion, parent-ion and neutral-loss) in an attempt to develop a useful screening method. On known compounds, best results were found when using a negative-ion neutral-loss scan to detect the loss of 64 mass units (corresponding to loss of SO2). This was confirmed by successful use of this scan to screen a sample of sulphonate residues.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290041020
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Calendar of events (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. i 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290041028
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Fragmentation of the metastable dieckmann ester molecular ion: Loss of carbon monoxide (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 488-490 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The structure of the ionized enol of methyl 4-buteneoate ([10]+·) is proposed for the [M-CO]+· ions from the metastable Dieckmaann ester 2-oxocyclopentanecarboxylate molecular ion. This proposal is based on a comparison of the metastable-ion mass spectra and the kinetic energy releases of these ions with the same data of an authentic ion [10]+·.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290041108
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Masthead (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990) 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290041201
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Analysis of arachidonic-acid-containing molecular species in glycerophospholipid classes from rat kidney by fast-atom bombardment mass spectrometry (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 495-497 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The qualitative analysis of the molecular species of phosphatidylinositol, phosphatidylethanolamine, phosphatidylcholine and phosphatidylserine from a rat kidney, by fast-atom bombardment mass spectrometry after separation and purification by liquid chromatography is described. The present results indicate that a high content of arachidonic-acid-containing molecular species within major glycerophospholipid classes is present in this biological sample.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290041203
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Electron-ionization-Induced fragmentation of N-monosubstituted 2-phenylacetamides (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 498-499 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Electron-ionization-induced mass spectra of N-monosubstituted 2-phenylacetamides were recorded and their fragmentation patterns were studied by metastable-ion analyses. Representative deuterated analogues of these compounds have also been synthesized and their mass spectra compared with those of the unlabelled parent compounds. The most typical fragmentation for N-alkyl-, N-isoalkyl- and N-cycloalkyl-2-phenylacetamides is cleavage of the bond β to the carbonyl function, resulting in an ion fragment of m/z 92, following the transfer of hydrogen and elimination of a corresponding ketene. The primary fragmentation process for N-aryl substituted 2-phenylacetamides is the loss of an aromatic hydrogen atom from the molecular ion. The other principal fragmentation processes observed with these compounds are discussed.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290041204
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...