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The antioxidant activity of three lettuce varieties (Lactuca sativa L.)   Emerald, Vera and Neva, cultivated in two kinds of protected spaces, a   glasshouse and a plastic greenhouse, under controlled conditions, was   determined. The content of antioxidant compounds: total phenols, flavonoids,   L-ascorbic acid, ß-carotene and lycopene, were determined in ethanolic   extracts of the lettuce with spectrophotometric methods. The largest content   of total phenols (78.98 ± 0.67 mg GAE/g of dry extract) was found in   ethanolic extract of the lettuce variety Neva cultivated in a plastic   greenhouse, whereas the largest content of flavonoids (35.45 ± 0.95 mg RU/g   of dry extract) was displayed in the lettuce Emerald cultivated in a   glasshouse. It was observed that the lettuce cultivated in the glasshouse   contained a somewhat higher content of L-ascorbic acid than the lettuce same   variety from plastic greenhouse. The content of lycopene in the examined   lettuce is negligible, and the content of ß-carotene is low. On the other   hand, the high content of phenolic components causes favourable antioxidant   properties found in all varieties of examined lettuce. [Projekat Ministarstva   nauke Republike Srbije, br. TR 31059: A new concept in breeding vegetable   cultivars and hybrids designed for sustainable growing systems using   biotechnological methods

Antioxidant capacity and contents of phenols, ascorbic acid, β-carotene and lycopene in lettuce