Abstract
In the NO2-exposure of tyrosine in 70% dioxane/phosphate buffer (pH 7.4), β-carotene enhanced the degradation of tyrosine and/or 3-nitrotyrosine produced, whereas α-tocopherol and ascorbyl palmitate inhibited the transformation of tyrosine into 3-nitrotyrosine. Generation of certain active species in the interaction of β-carotene with NO2 was suggested. Ascorbyl palmitate effectively and α-tocopherol slightly inhibited the transformation of tyrosine in the NO2-exposure in the presence of β-carotene. In the reaction of tyrosine with ONOO-ON OOH, β-carotene enhanced the degradation of 3-nitrotyrosine produced suggesting generation of certain active species, whereas α-tocopherol and ascorbyl palmitate completely suppressed the transformation of tyrosine into 3-nitrotyrosine.
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