Dependence among total polyphenols content, total antioxidant capacity and heavy metals content in potatoes

Janette Musilová,Judita Bystrická,Pavol Lednický,Beáta Volnová

doi:10.5219/532

Janette Musilová, Judita Bystrická + Show 2 more

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https://doi.org/10.5219/532

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Abstract

Polyphenols belong to the most significant compounds with antioxidant effects in potatoes. Their content depends on several factors. The most important factor is the variety of potatoes and the conditions of their growing such as temperature, rainfall, altitude, agronomic and chemical characteristics of the soil. We have compared two potato cultivars in the study which have been grown in the Slovak localities Dolné Obdokovce and Vrbová nad Váhom (cv. Agria) and Nitra, Radošina and Vrbová nad Váhom (cv. Impala). In lyophilized samples of potatoes total polyphenols content in ethanolic extracts using Folin-Ciocalteu agens and in methanolic extracts total antioxidant capacity using DPPH were spectrophotometrically determined. The average total polyphenols content in the potato variety Impala was 604.26 ±120.70 mg.kg-1 dry matter (DM) and 529.37 ±59.35 mg.kg-1 DM in the variety Agria. The average value of total antioxidant capacity, expressed in % inhibition, was 8.44 ±1.68% in the potato variety Impala and 8.09 ±1.14% in Agria. The results obtained were evaluated by One-way analysis of variance ANOVA (LSD-test), using Statistical Analysis Software Statgraphics. Mutual correlations among the total polyphenols content, total antioxidant capacity and heavy metals concent (Pb, Ni, Cd - determined using atomic absorption spectrometry (AAS) method: Cd, Pb: GF-AAS and Ni F-AAS) were evaluated using the correlation and regression analysis (Microsoft Excel). Statistically significant interdependence (p <0.05) was only confirmed between the Cd content and total antioxidant capacity in both cultivars, or between the Ni content and total antioxidant capacity in the variety Impala.

Highlights

Potato (Solanum tuberosum L.) is one of the world’s most important crops, ranking fifth in terms of human consumption and sixth in worldwide production with 324 million tonne production
The total polyphenols content (TPC) in potatoes of the variety Impala was on average 14% higher than in Agria, and we found statistically significant differences between the TPC values within one variety grown in different locations
The influence of the variety on the Cd, Pb and Ni accumulation ratio, polyphenols content and antioxidant capacity were confirmed in the potato cultivars Agria and Impala grown in the localities Dolné Obdokovce, Nitra, Radošina and Vrbová nad Váhom

Summary

Introduction

Potato (Solanum tuberosum L.) is one of the world’s most important crops, ranking fifth in terms of human consumption and sixth in worldwide production with 324 million tonne production. Potatoes are promoted as healthy food items due to the presence of essential amino acids, vitamins, minerals and antioxidants. They contain important amounts of polyphenols, a class of secondary plant metabolites (Deußer et al, 2012). All these bioactive chemicals have disease-fighting properties. Consumption of foods rich in antioxidant polyphenols is significantly associated with reduced risk of various non-communicable human diseases, including diabetes (Talukdar, 2013). Consumption of foods rich in antioxidant polyphenols is significantly associated with reduced risk of various non-communicable human diseases, including diabetes (Talukdar, 2013). Brat et al (2006) classified potatoes as the important sources of polyphenols for their relatively high consumption (compared to 24 fruits, only the contribution of apples was higher than that of potatoes)

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