Lipid deterioration: β‐Carotene destruction and oxygen evolution in a system containing lactoperoxidase, hydrogen peroxide and halides

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Abstract
A model system containing lactoperoxidase/H2O2/halide decomposed β-carotene in a reaction greatly affected by the concentration of H2O2. The optimal concentrations of H2O2 for activation of iodide and bromide were 2 mM and 10 μM, respectively. The oxidation of chloride by a lactoperoxidase, using β-carotene destruction as a sensitive method to determine the activity of the enzyme, is reported herein. In the presence of optimal amounts of H2O2, the rate of β-carotene destruction increases slowly until a critical concentration of the halides, followed by a rapid increase in the rate when halide concentrations were furthere increased. A lactoperoxidase/H2O2/iodide and/or bromide system generates oxygen in the presence of high H2O2 and halide concentrations. β-Carotene inhibited the evolution of oxygen. A possible mechanism of β-carotene destruction and triplet unexcited oxygen evolution by a lactoperoxidase/H2O2/halide system are proposed.

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