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Food Lipids: Chemistry, Nutrition, and Biotechnology

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Figure 9 Reactions of singlet oxygen with olefins, sulfides, <strong>and</strong> phenols [36].<br />

in Table 2. Hydroperoxides formed by singlet oxygen oxidation are at positions that<br />

formerly contained double bonds. Singlet oxygen produced conjugated <strong>and</strong> nonconjugated<br />

hydroperoxides from linoleic <strong>and</strong> linolenic acids, but the triplet oxygen produced<br />

only conjugated hydroperoxides from linoleic <strong>and</strong> linolenic acids. The relative<br />

reaction rates of triplet oxygen <strong>and</strong> singlet oxygen with oleic, linoleic, <strong>and</strong> linolenic<br />

Figure 10 Energy required for hydrogen removal from linoleic acid.<br />

Copyright 2002 by Marcel Dekker, Inc. All Rights Reserved.

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