Abstract
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, ?-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 ?-carotene is low. On the other hand, the high content of phenolic components causes favourable antioxidant properties found in all varieties of examined lettuce.
Highlights
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 results have shown that ethanolic extracts of the examined lettuce varieties possess an antioxidant activity with total antioxidant capacity ranging from 70.98±0.35 μg Ascorbic acid (AA)/g in the lettuce Vera cultivated in the glasshouse to 68.99±0.67 μg AA/g in the lettuce Emerald from the glasshouse (Table 1)
The presented research of the content of the antioxidant components and the antioxidant activity of the three lettuce varieties confirmed the values of lettuce in everyday nutrition
Summary
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 aim of this paper has been to determine the content of antioxidant components (total phenols, flavonoids, L-ascorbic acid, β-carotene and lycopene) and antioxidant activity of three lettuce varieties.
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