COMPARING METHYLENE BLUE-PHOTOSENSITIZED OXIDATION OF METHYL-CONJUGATED LINOLEATE AND METHYL LINOLEATE

The photooxidations of methyl-conjugated linoleate (MCL) and methyl li noleate (ML) were compared using methylene blue as a sensitizer in eth anol solutions. MCL was lost to a lower extent and yielded less hydrop eroxide but bleached methylene blue at a higher rate than ML. The diff erent isomers of MCL were not equally lost, and the photooxidation of MCL was accompanied by interisomerization. The results suggested that different mechanisms were involved in the photooxidations of MCL and M L.