Antioxidant Activity of Condensed Tannins of Beach Pea, Canola Hulls, Evening Primrose, and Faba Bean

Condensed tannins were extracted from beach pea, Cyclone canola hulls, evening primrose and faba bean using 70% aqueous acetone. The dried crude tannin extracts were purified on a Sephadex LH‐20 column using first 95% ethanol as a mobile phase for elution of nontannin phenolics and then 50% aqueous acetone to elute tannins. The total content of polyphenolics in tannin extracts ranged between 10 and 405 mg catechin equivalents per 1 g extract. All tannins extracts displayed a marked antioxidant activity in a β‐carotene‐linoleate model system. Evening primrose and faba bean tannin extracts exhibited the best