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Analysis of isotopic label migration in (10E,12Z)-CLA. A, mass spectrum of (10E,12Z)-CLA derived from nonlabeled LA. Peaks corresponding to fragments C-9-C12 are marked, and the fragmentation pattern of 4,4-dimethyloxazoline-(10E,12Z)-CLA is shown (inset). B, mass spectrum of (10E,12Z)-CLA derived from (11S)-deuterio-LA. Inset, 11-proS-hydrogen is not abstracted by PAI. C, same as B, but 11-dideuterio-LA was used as the substrate. Inset, scheme of deuterium transfer by PAI.
