BETA-CAROTENE COOXIDATION BY SOYBEAN LIPOXYGENASE TYPE-1 IN NONCONVENTIONAL MEDIA

Carotene cooxidation and linoleic acid peroxidation reactions catalyse d by soybean lipoxygenase type 1 are competitive. In the presence of w ater activity depressors (mannitol, maltose, sucrose, sorbitol), both the cooxidation reaction (rate of carotene bleaching) and the peroxida tion reaction (depletion of the available oxygen, conjugated diene for mation) were modulated. In all the tested media, the carbonyl producti on was limited by carotene. In conclusion, an explanation for the acti on of these water activity depressors is proposed.