Conclusions Soybean lecithin added to canola oil emulsions significantly re- duced and decelerated iron-catalyzed oil oxidation by lowering headspace oxygen consumption and hydroperoxide production However, soybean lecithin had no significant antioxidant effect on chlorophyll-photosensitized oxidation of the emulsions. Dur ing iron-catalyzed and chlorophyll-photosensitized oxidation, PLS derived from soybean lecithin which was added to the emulsion were degraded, with little change in the PL composition. Among PLs, PE and PI were degraded the fastest in the iron-catalyzed au toxidation and the chlorophyll-photosensitized oxidation, respectively, which was possibly due to radical scavenging and chemical quenching of singlet oxygen, respectively, as a main action mechanism as antioxidants in oil oxidation of the canola oil emulsions.