Investigation of lacidipine, a new 1,4-dihydropyridine antihypertensive agent and three chemically related compounds by means of chemical ionization, mass spectrometry and collision-induced dissociation

1992 ◽  
Vol 27 (3) ◽  
pp. 240-250 ◽  
Author(s):  
M. Harridan ◽  
M. Scandola ◽  
D. Franchi ◽  
G. Gaviraghi ◽  
G. Tarzia
Keyword(s):  
Mass Spectrometry ◽  
Antihypertensive Agent ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Collision Induced Dissociation ◽  
Ionization Mass ◽  
Related Compounds

Chemical ionization mass spectrometry of doxylamine and related compounds

1985 ◽  
Vol 20 (7) ◽  
pp. 435-439 ◽  
Author(s):  
Walter A. Korfmacher ◽  
Claude L. Holder ◽  
James P. Freeman ◽  
Ronald K. Mitchum ◽  
Aubrey B. Gosnell
Keyword(s):  
Mass Spectrometry ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Related Compounds

Chemical Ionization Mass Spectrometry of N-Methylcarbamate Insecticides, Some of Their Metabolites, and Related Compounds

1975 ◽  
Vol 58 (3) ◽  
pp. 541-547 ◽  
Author(s):  
Roy L Holmstead ◽  
John E Casida
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Related Compounds

Abstract The chemical ionization (CI) mass spectra with methane as the reagent gas are reported for 25 N-methylcarbamato insecticides or related compounds. The [M + 1]+ ions in the CI spectra are larger than the parent ions in the corresponding electron impact (EI) spectra of N-methyl- and N,N-dimethylcarbamates, but the contrary is true with N-hydroxymethylcarbamates. CI but not EI fragmentation of substituted- phenyl N-hydroxymethylcarbamates [ROC(0)NHCH2OH] appears to involve a 4-membered [ROC(0)NHCH2]+ intermediate which rearranges to give a [ROCH2]+ fragment. Other fragmentations unique to the CI spectra are also discussed.

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