Results 261 to 270 of about 423,639 (301)
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Electrospray tandem mass spectrometry of aminochromes
Rapid Communications in Mass Spectrometry, 2001Abstract The catecholamines adrenaline, noradrenaline, dopamine, dopa and isoprenaline were oxidized into their respective aminochromes: adrenochrome, noradrenochrome, dopaminochrome, dopachrome and isoprenochrome.
F, Lemos-Amado +7 more
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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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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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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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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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Tandem Time‐of‐Flight Mass Spectrometry
2005A new tandem time-of-flight (TOF-TOF) instrument has been developed by modifying a standard matrix-assisted laser desorption ionization (MALDI)-TOF instrument to make high-performance, high-energy collision-induced dissociation (CID) MALDI tandem mass spectrometry (MS) a practical reality.
Marvin L, Vestal, Jennifer M, Campbell
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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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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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Tandem Mass Spectrometry for Sequencing Proanthocyanidins
Analytical Chemistry, 2007Proanthocyanidins (PAs) are a group of bioflavonoids consisting of oligomers based on catechin monomeric units. These polyphenolic compounds are widely distributed in higher plants and are an integral part of the human diet. A sensitive LC-tandem mass spectrometric (LC/ESI-MS(n)) method in the positive ion mode for sequencing these ubiquitous and ...
Hui-Jing, Li, Max L, Deinzer
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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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