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Antioxidant activity of calendula [Calendula officinalis L.] flowers as a result of form and dose nitrogen

100%

Biesiada A., Sokol-Letowska A., Kucharska A.

Herba Polonica

2007

tom 53

nr 3

In the field experiment conducted in 2004—2005 the effect of form and rate of nitrogen on chemical composition and antioxidant activity of calendula flowers was estimated. Plants fertilized with urea had the highest level of phenolic compounds in flowers. The highest level of total carotenoids was noticed in flowers from plots fertilized with nitrate form of nitrogen and the lowest when the source of nitrogen was ammonium sulphate. In treatments fertilized with nitrate N form the level of chlorophyll was the highest and in another treatments lower and rather similar. Among the tested forms of nitrogen a higher antioxidant activity assured urea and ammonium sulphate in both FRAP and ABTS method. The antioxidant activity was highest in treatment fertilized with nitrogen in dose of 100 kg N-ha1.

Ograniczanie wyników

1 Herba Polonica

1 Biesiada A.

1 Kucharska A.

1 Sokol-Letowska A.

1 2007

Wyniki wyszukiwania

Antioxidant activity of calendula [Calendula officinalis L.] flowers as a result of form and dose nitrogen