The acids from autoxidation of methyl linoleate have been analyzed as their methyl esters by combined capillary gas chromatography-mass spectrometry (GC-MS). The principal components were hexanoic, trans-2-octenoic, suberic and azelaic acid. Minor components included formic, pentanoic, heptanoic, trans-2-heptenoic, octanoic and nonanoic acid. In addition, trans-2,3-epoxy-octanoic acid was isolated as its methyl ester by preparative GLC and was identified by means of NMR, high resolution MS, IR and by conversion to a known derivative. © 1969 AOCS Press.