The interactions of carotenoids (bixin, b-carotene and lycopene) with CCl3OO in aqueous and i-propylalcohol solution saturated with air have been studied by pulse radiolysis. For bixin and b-carotene reaction products from forming process, absorbing in the region of 650 nm, is observed with concomitant carotenoid bleaching (bixin at 500 nm, b-carotene at 450 nm). Their rate constants from forming process are 1.78×108 and 7.8×107 mol-1·L·s-1 respectively. How-ever, in the case of lycopene, no such a forming process of reaction as bixin and b-carotene can be observed although there is the bleaching reaction (rate constant 4×107 mol-1·L·s-1). The results suggest that the carotenoid radical cation and an additional radical are produced in the case of bixin and b-carotene, whereas lycopene undergoes electron transfer with CCl3OO·, form-ing cation radical. The interactions of carotenoids (bixin, b-carotene and lycopene) with CCl3OO in aqueous and i-propylalcohol solution saturated with air have been studied by pulse radiolysis. For bixin and b-carotene reaction products from forming process, nm, was observed with concomitant carotenoid bleaching (bixin at 500 nm, b-carotene at 450 nm). Their rate constants from forming processes were 1.78 × 108 and 7.8 × 107 mol-1 · L · s-1 respectively. How-ever , in the case of lycopene, no such a forming process of reaction as bixin and b-carotene can be viewed that there is the bleaching reaction rate (4 × 107 mol-1 · L · s-1). The results suggest that the carotenoid radical cation and an additional radical are produced in the case of bixin and b-carotene, lycopene undergoes electron transfer with CCl3OO ·, form-ing cation radical.