TOTAL POLYPHENOL CONTENT AND ANTIOXIDANT ACTIVITY OF RUTABAGA (BRASSICA NAPUS L. VAR. NAPOBRASSICA) ROOTS

Abstract

This study aims to determine the total content of polyphenols and the antioxidant activity by DPPH spectrophotometrically in rutabaga (Brassica napus L. var. napobrassica) samples, cultivated in the Trenčín region, in the Púchov district, at the border of the White Carpathian and Javorníky mountains, Slovakia. For analysis were used three types of rutabaga, named after the collection sites (Mestečko, Lúky 1, Lúky 2). The total polyphenol content in rutabaga was ranging from 2.41 (Mestečko) to 2.82 mg GAE.g^-1 dry weight (Lúky 2). It was established that that the studied rutabaga samples do not show a significant difference in the total content of polyphenols between the collection locations. In the antioxidant activity of rutabaga, differences were confirmed in AAs. A statistical difference was established between locations Lúky 2 and Mestečko. DPPH radical scavenging activity values were from 5,19 (Mestečko) to 7,49 µmol TE.g-1 DW (Lúky 2). Spearman's test showed a positive relationship between both methods used. These results confirm the promising potential of rutabaga use in functional food preparation.