Characterization of isomeric dimethylfuranocoumarins by electron impact ionization and surface and gaseous collision activation mass spectrometry

1989 ◽  
Vol 18 (10) ◽  
pp. 927-934 ◽  
Author(s):  
S. R. Horning ◽  
M. E. Bier ◽  
R. G. Cooks ◽  
G. Brusini ◽  
P. Traldi ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Collision Activation

Characterization of ice-nucleating bacteria using on-line electron impact ionization aerosol mass spectrometry

2015 ◽  
Vol 50 (4) ◽  
pp. 662-671 ◽  
Author(s):  
R. Wolf ◽  
J. G. Slowik ◽  
C. Schaupp ◽  
P. Amato ◽  
H. Saathoff ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Aerosol Mass ◽  
Aerosol Mass Spectrometry ◽  
On Line

Gas-Liquid Chromatographic/Mass Spectrometric Screening Method for T-2 Toxin in Milk

1979 ◽  
Vol 62 (6) ◽  
pp. 1274-1280
Author(s):  
George J Collins ◽  
Joseph D Rosen
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Chemical Ionization ◽  
Impact Ionization ◽  
Trimethylsilyl Ether ◽  
Screening Method ◽  
Internal Standard ◽  
Electron Impact Ionization ◽  
Gas Liquid Chromatography ◽  
Ionization Mass

Abstract A method for the analysis of T-2 toxin in milk is presented. Ethyl acetate extracts of milk samples which had been spiked with T-2 toxin were purified by thin layer chromatography and derivatized with N,O-bis(trimethylsilyl)acetamide to produce the T-2 toxin trimethylsilyl ether (T-2 toxin-TMS). N,O-bis(trimethylsilyl-d9)acetamide was used to make T-2 toxin d9-trimethylsilyl ether (T-2 toxin-d9TMS) which was added to the derivatized milk extract as an internal standard. Samples were analyzed by combined gas-liquid chromatography/mass spectrometry using either electron impact ionization or chemical ionization mass spectrometry. In electron impact ionization analyses, simultaneous monitoring of the T-2 toxin-TMS fragment ion at m/z 436 and the T-2 toxin-d9TMS fragment ion at m/z 445 gave a T-2 toxin-TMS detectability estimated at 6 μg/kg. In chemical ionization analyses, the T-2 toxin-TMS fragment ion at m/z 377 and the T-2 toxin-d9TMS fragment ion at m/z 386 were simultaneously monitored to give a T-2 toxin-TMS detectability estimated at 3 μg/kg. Average recovery was 85% at 200 μg/kg and 65% at 20 μg/kg.

Detection by mass spectrometry of hydrocarbon biradicals, pyridine and aniline in a flame ionization detector

1982 ◽  
Vol 35 (8) ◽  
pp. 1743 ◽  
Author(s):  
M Head ◽  
T McAllister
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Aromatic Compounds ◽  
Mass Spectra ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Flame Ionization Detector ◽  
Ionization Detector ◽  
Flame Ionization ◽  
Reaction Zones

The mass spectra of ions of > 75 in an f.i.d.-type flame with benzene additive have shown that hitherto undetected species of formulas CllH9+ and CI3H9+ are present, which may be attributed to protonation of the biradicals C11H8 and C13H8 by H3O+. The remainder of the hydrocarbon ions present are attributable to protonation of aromatic compounds (e.g. naphthalene and indene) which have been detected previously in premixed benzeneloxygen flames by electron impact ionization. Addition of NH3 to the benzene sample suppresses all the hydrocarbon peaks of m/z > 100 but generates new peaks of m/z 80 and 94, attributable to the protonation of pyridine and aniline. Aniline may be generated by addition of NH2 radicals to benzene in the pyrolysis and reaction zones of the flame.

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