Abstract
Chlorophyll was rapidly destroyed in the presence of bisulfite and linoleic acid hydroperoxide. Both bisulfite and linoleic acid hydroperoxide were required for chlorophyll destruction and both were consumed in the reaction; however, there was no oxygen requirement. Chlorophyll destruction occurred most readily in the slightly acidic pH region with little destruction occurring above pH 8. The free radical scavengers, hydroquinone and α-tocopherol, were very effective at inhibiting chlorophyll destruction, but the singlet oxygen quenchers, β-carotene, 2,5-dimethylfuran and 1,3-diphenylisobenzofuran, were only slightly effective. The addition of metal chelators indicated that metals were not participating in the reaction. The evidence indicates that chlorophyll was destroyed by a free radical mechanism. Based on the present results and that of others, it is suggested that chlorophyll was destroyed via oxidation by the alkoxy radical which was produced during the decomposition of linoleic acid hydroperoxide by bisulfite.
Published Version
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