There are two main categories of antioxidants: Primary antioxidants interrupt the oxidative free radical chain reaction by contributing an electron or hydrogen from the phenolic hydroxyl groups and therefore stabilize free radicals, which do not further initiate or propagate further oxidation of lipids. Secondary antioxidants deactivate singlet oxygen, chelate metals and regenerate primary antioxidants.
For better efficiency, primary antioxidants are often used in combination with secondary antioxidants.
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