“…(b) methyl 9-cis,12-cis linoleate in a 1:1 mixture of methyl 9-cis,12-cis linoleate and 9-cis,11-trans (L in LCL1); methyl 9-cis,11-trans linoleate in a 1:1 mixture of methyl 9-cis,12-cis linoleate and 9-cis,11-trans (CL1 in LCL1); methyl 9-cis,12-cis linoleate in a 1:1 mixture of methyl 9-cis,12-cis linoleate and 10-trans,12-cis (L in LCL2) and methyl 10-trans,12-cis linoleate in a 1:1 mixture of methyl 9-cis,12-cis linoleate and 10-trans,12-cis (CL2 in LCL2) oxidation compounds could be followed from the beginning and along the oxidation period. The method offers the advantage that differences in molecular weight between unoxidized and oxidized monomeric molecules of monoacid methyl esters are sufficient as to be eluted at distinct retention times [19,20]. However, when analyzing triacylglycerols, fats or oils, a preliminary step to separate the non-oxidized fraction is essential, as described previously [21].…”