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Categories of antioxidants.
| (1) Endogenous antioxidants | (a) Enzymatic |
| (b) Nonenzymatic | |
|
| |
| (2) Exogenous antioxidants | (a) From natural sources (i.e., secondary products of plants which are functioning as antioxidants): |
| (i) Chlorophyll derivatives | |
| (ii) Essential oils | |
| (iii) Carotenoids | |
| (iv) Alkaloids | |
| (v) Phytosterols | |
| (vi) Phenols: coumarins, flavonoids | |
| (vii) Polyphenols: tannins, proanthocyanidins | |
| (viii) Nitrogen-containing compounds: alkaloids, indoles | |
| (b) Dietary antioxidants | |
