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The changes of the polyphenol content and antioxidant activity in potato tubers (Solanum tuberosum L.) due to nitrogen fertilization

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Author(s): Janette Musilová | Jaromír Lachman | Judita Bystrická | Zuzana Poláková | Peter Kováčik | Diana Hrabovská

Journal: Potravinarstvo : Scientific Journal for Food Industry
ISSN 1338-0230

Volume: 7;
Issue: 1;
Start page: 164;
Date: 2013;
Original page

Keywords: potato | polyphenol | antioxidant activity | nitrogen fertilization

ABSTRACT
Cultivar is one of the most important internal factors affecting polyphenol concentration in the plants. However, influence of the grown locality, climate conditions and way of cultivation belong to important external factors. In our experiment the influence of different nitrogen doses (0 - 40 - 80 - 120 - 160 - 240 kg N.ha-1) applied in the form of Vermikompost on the total polyphenol content and derived total antioxidant activity in cv. Sorento were investigated. While in the 1st - 5th variants the determined polyphenol content in dry mater of potato tubers decreased from 399.2 to 70.40 mg.kg-1, in the 6th variant that was twice higher in comparison to the 5th variants (135.6 mg.kg-1). The statistically significant differences in values of total polyphenol content between variants (polynomial function of 2nd degree) were confirmed. The study also confirmed a strong statistical correlation between the content of polyphenols and the content of antioxidant activity has been confirmed (sign. F: 3.24E-10). The highest value of antioxidant activity was observed in the first variant. From the first to the fifth variant (7.62 - 4.84%), the value of antioxidant activity was decreasing and in the sixth variant this value increased to 6.31%.
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