Results 261 to 270 of about 417,804 (305)
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Analytical Biochemistry, 2001
Tetrodotoxin (TTX), a powerful sodium channel blocker, usually exists as a mixture of its analogs (TTXs) in natural sources. Due to the structural variation, some analogs are difficult to detect using the postcolumn liquid chromatography-fluorescent detection (LC-FLD) system.
Y, Shoji +3 more
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Tetrodotoxin (TTX), a powerful sodium channel blocker, usually exists as a mixture of its analogs (TTXs) in natural sources. Due to the structural variation, some analogs are difficult to detect using the postcolumn liquid chromatography-fluorescent detection (LC-FLD) system.
Y, Shoji +3 more
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Electrospray tandem mass spectrometry of epipolythiodioxopiperazines
Journal of Mass Spectrometry, 2007AbstractLow‐energy collision‐induced electrospray ionization tandem mass spectrometry ESI‐CID‐MS/MS (in the positive ion mode) was used for the structural characterization of a series of five representative epioplythiodioxopipreazines: dethiotetra(methylthio)chemotin, chaetocochins A, B and C, and chemotin isolated from the fungus Chaetomium cochliodes.
Zhi-Jun, Wu +5 more
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Tandem Ionization Mass Spectrometry of Biomolecules
European Journal of Mass Spectrometry, 2000The novel mass spectrometric technique tandem ionization mass spectrometry (TIMS) employs irradiation of gas-phase even-electron molecular ions of both polarities with >10 eV electrons. This leads to the production of radical molecular cations and anions of large biomolecules.
Zubarev, R.A. +2 more
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2010
Electron ionization mass spectra show a wealth of fragment ion peaks allowing to retrieve structural information, often though at the expense of abundance of the molecular ion. For decades, EI has served as the one and only ionization method of organic mass spectrometry.
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Electron ionization mass spectra show a wealth of fragment ion peaks allowing to retrieve structural information, often though at the expense of abundance of the molecular ion. For decades, EI has served as the one and only ionization method of organic mass spectrometry.
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Phospholipid profiling by tandem mass spectrometry
Journal of Chromatography B, 2009This review discusses how to analyze glycerophospholipids from simple lipid extracts without preliminary chromatographic separation. The analytical method emphasized in the review is electrospray ionization with tandem mass spectrometry.
Zheng, Cui, Michael J, Thomas
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Hybrid Tandem Mass Spectrometry
1992The development of hybrid sector/quadrupole instruments for tandem mass spectrometry is described. The operational modes of these instruments are illustrated by MS/MS and MS/MS/MS analyses of peptides, xenobiotic metabolites and other compounds of biological importance.The versatility of operation (with respect to scan modes and the conditions utilized
Simon J. Gaskell, Kevin D. Ballard
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Electrospray tandem mass spectrometry of lexitropsins
Rapid Communications in Mass Spectrometry, 2001Abstract Several compounds, representative of the class of lexitropsins, were analyzed by electrospray tandem mass spectrometry. The study of the fragmentations of the protonated molecular species ([M + H] + ) and of selected fragment ions allowed proposals for the main ...
M R, Domingues +4 more
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Focused lipidomics by tandem mass spectrometry
Journal of Chromatography B, 2005In this paper we performed focused analyses of phospholipids by using the data of precursor ion scanning and neutral loss scanning of their polar head groups and fatty acyl moieties for the specific search of categorical phospholipids. By using precursor ion scanning or neutral loss scanning of polar head groups in the positive ion mode, more sensitive
Ryo, Taguchi +6 more
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Acylcarnitine Analysis by Tandem Mass Spectrometry
Current Protocols in Human Genetics, 2010AbstractCarnitine plays an essential role in fatty acid metabolism, as well as modulation of intracellular concentrations of free coenzyme A by esterification of acyl residues. Acylcarnitine analysis of various biological fluids is a sensitive method to detect >20 inborn errors of metabolism that result in abnormal accumulation of acylcarnitine ...
Emily H, Smith, Dietrich, Matern
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Electrospray Tandem Mass Spectrometry of Nucleotides
Rapid Communications in Mass Spectrometry, 1996The tandem mass spectra (MS/MS) following electrospray ionization of nucleotides (from 2- to 6-mers) have been examined under a range of collision and ionization conditions. In general, abundant peaks due to the free bases and phosphate groups are observed, along with a limited number of sequence ions.
J, Boschenok, M M, Sheil
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