scholarly journals Identification of some Neutral Lipids of Thiobacillus Thioparus Using Gas Chromatography-Chemical Ionization Mass Spectrometry

1980 ◽  
Vol 33 (6) ◽  
pp. 737 ◽  
Author(s):  
RK Christopher ◽  
AM Duffield ◽  
BJ Ralph
Keyword(s):  
Mass Spectrometry ◽  
Chemical Ionization ◽  
Neutral Lipids ◽  
Lipid Fraction ◽  
Ethyl Esters ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Thiobacillus Thioparus ◽  
Long Chain

The neutral lipid fraction of two strains of T. thioparus was examined using gas chromatographychemical ionization mass spectrometry. Both strains were found to produce fatty acid ethyl esters, long-chain alcohols and. wax esters. In addition, one strain produced substantial quantities of squalene, although no sterols or triterpenoids could be detected. However, in the second strain, although squalene was present at greatly reduced levels, cholesterol, lanosteryl acetate and 24,25-dihydrolanosteryl acetate were identified.

Chemical Ionization Mass Spectrometry: A Useful Stereochemistry Probe

1977 ◽  
Vol 32 (5) ◽  
pp. 573-580 ◽  
Author(s):  
C. C. Van de Sande ◽  
F. Van Gaever ◽  
P. Sandra ◽  
J. Monstrey
Keyword(s):  
Mass Spectrometry ◽  
Charge Exchange ◽  
Chemical Ionization ◽  
Ethyl Esters ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Cyclohexanecarboxylic Acid

The helium charge exchange and the isobutane chemical ionization spectra of 4-methoxy cyclohexanecarboxylic acid ethyl esters (1c and 1t), 2,6-dimethyl-4-hydroxytetrahydropyranes (2c and 2t), 2,4,6-trimethyl-4-hydroxytetrahydropyranes (8c and 3t), and 2,7-dimethoxy-cis-decalins (4c and 4t) have been screened for correlations with the stereochemistry of these molecules. From these data it appears that chemical ionization is especially suited for configurational assignments in epimeric molecules.

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