The Effect of Light Exposures on the Content of Harmful Substances in Edible Potato Tuber

Katarzyna Rymuza, Marek Gugała, Krystyna Zarzecka, Anna Sikorska, Pavol Findura, Urszula Malaga-Toboła, Krzysztof Kapela and Elżbieta Radzka
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Katarzyna Rymuza: Faculty of Agrobioengineering and Animal Husbandry, University of Natural Sciences and Humanities in Siedlce, ul. Prusa 14, 08-110 Siedlce, Poland
Marek Gugała: Faculty of Agrobioengineering and Animal Husbandry, University of Natural Sciences and Humanities in Siedlce, ul. Prusa 14, 08-110 Siedlce, Poland
Krystyna Zarzecka: Faculty of Agrobioengineering and Animal Husbandry, University of Natural Sciences and Humanities in Siedlce, ul. Prusa 14, 08-110 Siedlce, Poland
Anna Sikorska: Department of Agriculture, Vocational State School of Ignacy Mościcki in Ciechanów, ul. Narutowicza 9, 06-400 Ciechanów, Poland
Pavol Findura: Department of Biosystems Engineering; Slovak University of Agriculture Nitra, Tr. A. Hlinku 2, 949-76 Nitra, Slovak Republic
Urszula Malaga-Toboła: Faculty of Production and Power Engineering; University of Agriculture in Krakow, ul. Balicka 116B; 30-149 Krakow, Poland
Krzysztof Kapela: Faculty of Agrobioengineering and Animal Husbandry, University of Natural Sciences and Humanities in Siedlce, ul. Prusa 14, 08-110 Siedlce, Poland
Elżbieta Radzka: Faculty of Agrobioengineering and Animal Husbandry, University of Natural Sciences and Humanities in Siedlce, ul. Prusa 14, 08-110 Siedlce, Poland

Agriculture, 2020, vol. 10, issue 5, 1-11

Abstract: Background: The impact of light on the content of undesirable substances is particularly important in the case of potatoes available in store where the tubers are exposed to continuous light access. Both washed and unwashed potatoes are available, hence the hypothesis that the amount of harmful substances stored in tubers depends not only on the time of their exposure to light, but also on whether they were washed or not. Methods: In order to verify the hypothesis, laboratory tests were carried out on the tubers of five potato varieties originating from a univariate field experiment. The aim of the study was to analyse the change in the content of total glycoalkaloids (TGA) and nitrates (V) in tubers of five potato varieties depending on the time of light exposition (0, 7, 14 days) and pretreatment of tubers. Results: It has been demonstrated that the content of glycoalkaloids and nitrates in potato tubers depended significantly on the variety, time of exposure to light and pretreatment. Most glycoalkaloids were accumulated in the tubers of the Lord (89.67 mg·kg −1 ) and Irga (89.05 mg·kg −1 ) varieties. The time of light exposure significantly influenced the increase in glycoalkaloids and nitrates in the studied potato tubers. The increase in TGA after 14 days ranged from 20.67 mg∙kg −1 for variety Vinieta to 54.67 mg∙kg −1 for variety Irga. The increase in nitrates ranged from 11.67 mg∙kg −1 for variety Bellarosa to 27.50 mg∙kg −1 for variety Irga. Exposure time affected the content of glycoalkaloids in a parabolic manner and the content of nitrates in a linear manner.

Keywords: glycoalkaloids; nitrates (V); Solanum tuberosum L.; variety; unwashed and washed tubers (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2020
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