Direct evidence of both electron ionization- and chemical ionization-like fragmentation in fast-atom bombardment mass spectra of prenylated flavonoids confirmed by tandem mass spectrometry

1989 ◽  
Vol 3 (1) ◽  
pp. 4-6 ◽  
Author(s):  
Mitsuo Takayama ◽  
Toshio Fukai ◽  
Taro Nomura ◽  
Kazutetsu Nojima
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Fast Atom Bombardment ◽  
Direct Evidence ◽  
Electron Ionization ◽  
Tandem Mass ◽  
Prenylated Flavonoids

scholarly journals Fast atom bombardment mass spectra of the .BETA.-blocker nipradilol with nitrate ester group-tandem mass spectrometry (MS/MS) and B/E constant linked scanning.

1990 ◽  
Vol 38 (12) ◽  
pp. 3389-3394 ◽  
Author(s):  
Michiaki YONEDA ◽  
Kazuo TSUJIMOTO ◽  
Mamoru OHASHI ◽  
Masami SHIRATSUCHI ◽  
Yasushi OHKAWA ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Beta Blocker ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Ester Group ◽  
Tandem Mass ◽  
Nitrate Ester

Analysis of Testosterone Esters by Tandem Mass Spectrometry

1993 ◽  
Vol 76 (2) ◽  
pp. 306-312 ◽  
Author(s):  
Thomas Cairns ◽  
Emil G Siegmund ◽  
Bobby Rader
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Relative Abundance ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Generic Product ◽  
Tandem Mass ◽  
Fragment Ions ◽  
Product Ions ◽  
The Individual

Abstract The electron ionization (El) and chemical ionization (CI) mass spectra of 12 representative testosterone esters were examined to explore the various analytical options available for identification and confirmation of the esters. Using El, a number of fragment ions indicated the identification of the testosterone moiety, but structural confirmation of the individual esters often required the observance of the molecular ion at very low relative abundance ratios. The acceptable analytical method involved CI/tandem mass spectrometry based on the production of the 2 generic product ions derived from the protonated molecule ion.

scholarly journals Analysis of Additives in Polyethylene with Desorption Chemical Ionization/Tandem Mass Spectrometry

1993 ◽  
Vol 47 (6) ◽  
pp. 844-851 ◽  
Author(s):  
S. W. Chen ◽  
G. R. Her
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Collision Induced Dissociation ◽  
Low Molecular Weight ◽  
Tandem Mass ◽  
Desorption Chemical Ionization ◽  
Great Confidence ◽  
Ionization Tandem Mass Spectrometry

Desorption chemical ionization with ammonia as the reagent gas in combination with tandem mass spectrometry is described for the analysis of additives in polyethylene. The additives were extracted with toluene and then analyzed directly by desorption chemical ionization and tandem mass spectrometry. With ammonia as the reagent gas, mass spectra of additives were found to contain intense pseudomolecular ions with very little fragmentation. In addition, low-molecular-weight polyethylene molecules extracted with the additives were barely detectable, and thus there was less likelihood of interference. Collision-induced dissociation of the pseudomolecular ions provided great confidence in the assignment of additives.

Unrestrictive protein modification localization and quality control for open search of mass spectra

2018 ◽  
Author(s):  
Zhiwu An ◽  
Fuzhou Gong ◽  
Yan Fu
Keyword(s):  
Mass Spectrometry ◽  
Quality Control ◽  
Tandem Mass Spectrometry ◽  
Mass Spectra ◽  
Protein Modification ◽  
Software Tool ◽  
Tandem Mass ◽  
Simulation Data ◽  
Post Translational Modifications

We have developed PTMiner, a first software tool for automated, confident filtering, localization and annotation of protein post-translational modifications identified by open (mass-tolerant) search of large tandem mass spectrometry datasets. The performance of the software was validated on carefully designed simulation data. <br>

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