Abstract
β-Carotene absorbed 2 equimolar amounts of NO 2 accompanying the complete destruction of β-carotene. Electron spin resonance study using 2-phenyl-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl revealed that no significant amounts of NO were released by the interaction. Nitrogen atoms derived from NO 2 were tightly bound to the β-carotene molecules. Destruction of β-carotene was inhibited little by α-tocopherol and polyunsaturated fatty esters, and slightly by ascorbyl palmitate, indicating that β-carotene was a more effective scavenger of NO 2. ONOOH/ONOO − and 3-morpholinosydononimine similarly destroyed β-carotene. The results suggest that β-carotene contributes to the prevention of cytotoxicity and genotoxicity of NO 2 and ONOOH/ONOO − derived from NO. © 1997 Federation of European Biochemical Societies.
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