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- Fast Atom Bombardment (FAB) Matrices
Posted by : kaushik zala
Tuesday, December 9, 2014
glycerol
. C3H8O3, m/z 92.0473
. first and most widely-used FAB matrix.
. best choice for polar compounds
1-thioglycerol
. C3H8O2S, m/z 108.0245
. similar uses to glycerol, but may enhance M+1 abundance
. more volatile than glycerol, evaporates quickly
3-nitrobenzyl alcohol (NBA)
. C7H7NO3, m/z 153.0416
. best choice for less polar compounds ( e.g. chlorophyll) and many organometallics
2-nitrophenyl octyl ether (NPOE)
. C14H21NO3, m/z 251.1521
. only FAB matrix with no reactive hydrogen
. good choice for reactive compounds such as organometallics
Note: this example contains trace PEG 600 contamination
triethanolamine
. C6H15NO3, m/z 149.1052
. good matrix for negative-ion FAB
. enhances [M-H]- formation."magic bullet"
. 5:1 mixture of dithiothreitol and dithioerythritol (DL-threo- and erythro-1,4-
dimercapto-2,3-butanediol)
. C4H10S2O2, m/z 154.0122
dioctyl phthalate (DOP)
. bis(2-ethylhexyl) phthalate
. C24H38O4, m/z 390.54
. Similar in use to NPOE
. Widespread contaminant in solvents, gives characteristic 149 peak in EI mass spectra
. Use care to avoid contaminating the mass spectrometer
sulfuric acid
. H2SO4, m/z 97.967384
. good for some inorganics and organometallics (e.g. copper phthalocyanine)
. corrosive, use care required
Yours Chromatographically,
Kaushik Zala
. C3H8O3, m/z 92.0473
. first and most widely-used FAB matrix.
. best choice for polar compounds
1-thioglycerol
. C3H8O2S, m/z 108.0245
. similar uses to glycerol, but may enhance M+1 abundance
. more volatile than glycerol, evaporates quickly
3-nitrobenzyl alcohol (NBA)
. C7H7NO3, m/z 153.0416
. best choice for less polar compounds ( e.g. chlorophyll) and many organometallics
2-nitrophenyl octyl ether (NPOE)
. C14H21NO3, m/z 251.1521
. only FAB matrix with no reactive hydrogen
. good choice for reactive compounds such as organometallics
Note: this example contains trace PEG 600 contamination
triethanolamine
. C6H15NO3, m/z 149.1052
. good matrix for negative-ion FAB
. enhances [M-H]- formation."magic bullet"
. 5:1 mixture of dithiothreitol and dithioerythritol (DL-threo- and erythro-1,4-
dimercapto-2,3-butanediol)
. C4H10S2O2, m/z 154.0122
dioctyl phthalate (DOP)
. bis(2-ethylhexyl) phthalate
. C24H38O4, m/z 390.54
. Similar in use to NPOE
. Widespread contaminant in solvents, gives characteristic 149 peak in EI mass spectra
. Use care to avoid contaminating the mass spectrometer
sulfuric acid
. H2SO4, m/z 97.967384
. good for some inorganics and organometallics (e.g. copper phthalocyanine)
. corrosive, use care required
Yours Chromatographically,
Kaushik Zala