Abstract
The aim of this study was to determine the total phenolic (TP) content and antioxidant activity (AA) in yellow (cvs. Impala, Karin, Dita, Saturna) and purple-fleshed (cvs. Valfi, Violette) potatoes grown in the Czech Republic in 2004 in four locations in precise field trials. TP content was determined by Folin-Ciocalteau assay and AA by DPPH assay both in freeze-dried tuber matter. Results showed a statistical significant difference in TP content and AA between yellow and purple-fleshed potatoes. Purple-fleshed cultivars showed higher TP content (by 60%) than yellow-fleshed cultivars; AA in purple-fleshed cultivars was twice as high as in yellow-fleshed potatoes. A medium linear correlation between TP and AA was found ( <I>r</I><sup>2</sup> = 0.747). Average TP content in yellow-fleshed cultivars was 2.96 GAE (g of gallic acid per kg dm); in purple-fleshed cultivars it was 4.68 GAE. Average AA in yellow-fleshed cultivars was 11.26 EAA (mg of ascorbic acid per 100 g dm) and in purple-fleshed cv. 24.79 EAA. Purple-fleshed potatoes showed a lower variation among localities (only 6%). Hence, regarding a relatively high potato intake by Czechs (72 kg per capita a year), contribution of potatoes, especially purple-fleshed, to total antioxidants intake should be considered.
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