(1) antioxidants can be divided into synthetic antioxidants (such as BHA, BHT, PG, etc.) and natural antioxidants (such as tea polyphenols, phytic acid, etc.) .
(2) antioxidants can be divided into oil-soluble, water-soluble and compatibility according to their solubility. Oil-soluble antioxidants include BHA and BHT, water-soluble antioxidants include ascorbic acid and tea polyphenols, and compatible antioxidants include ascorbic palmitic acid. Antioxidants can be divided into free radical absorbers, metal ion chelators, oxygen scavengers, peroxide decomposers, enzyme antioxidants, UV absorbers or singlet oxygen quenchers. Common antioxidants include tea polyphenols (TP) , tocopherols, flavonoids, Butylated hydroxyanisole acid (BHA) , dibutylhydroxytoluene (BHT) and tert-butylhydroquinone (TBHQ) .
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