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. Author manuscript; available in PMC: 2014 Feb 1.
Published in final edited form as: Chem Phys Lipids. 2013 Jan 23;0:21–32. doi: 10.1016/j.chemphyslip.2013.01.002

Figure 6. Identification of a δ-ketol.

Figure 6

(A) Total ion current chromatogram of the methyl ester, methoxime, TMS ether derivative of the -ketol formed during acid hydrolysis of 9S,10S-trans-epoxy,13S-hydroxy-octadec-11E-enoic acid showing the closely eluting syn and anti isomers at ~9.8 min. (B) EI mass spectrum of the first-eluting isomer with diagnostic ions at m/z 168 and 285. (C) Total ion current chromatogram of the methyl ester, TMS ether derivative. (D) The mass spectrum of the main peak has diagnostic ions at m/z 99 and 241 (Gardner and Kleiman 1979).