Total polyphenols content in fruits of selected cultivars of strawberries in relation to concentrations of cadmium and lead in soil

Pavol Trebichalský,Daniel Bajčan,Janette Musilová,Ľuboš Harangozo,Juliana Molnárová,Mária Timoracká

doi:10.5219/507

Pavol Trebichalský, Daniel Bajčan + Show 4 more

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https://doi.org/10.5219/507

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Abstract

The key aim of our study was to define the correlation of total polyphenols contents in seven cultivars of strawberries (Clery, Sonata, Alba, Korona, Ázia juh, Anthea, Joly) grown in the parcels with exceeded levels of pseudo-total Cd and mobile Pb in soil. Strawberries were grown in rows long 200 m, the distance of the plants was 0.35 m and inter-row distance was 1 m. Following fertilizing was applied - at the beginning of vegetation period the doses of elements (in kg.ha-1) were: N48.2 +P78.3 +K66.3 +Mg7.2, afterwards 23 days of elements were applied in liquid irrigation in amount: N46.5 +P34.8 +K118.7. Heavy metals in contamination soil were analysed by the method of atomic absorption spectroscopy and total contents of polyphenols spectrophotometrically. The highest content of all monitored parameters (pseudo-total and mobile Cd and Pb, as well as the amount of total polyphenols) was found in Ázia juh cultivar. There was statistically significant positive relation of total polyphenols contents in Anthea cultivar to levels of all monitored forms of metals in soil and contrary, in Clery cultivar there was found non-correlation of total polyphenols contents on levels of monitored heavy metals in soil (mainly of mobile contents of Cd and Pb contents). Contents of mobile forms of individual heavy metals positively correlated with total polyphenols (except of Clery and Ázia juh cultivars). Varietal relation on levels of total polyphenols was confirmed in experiment prior to relation of these organic compounds to the presence of monitored heavy metals in soil.

Highlights

IntroductionSeveral epidemiological studies verify that the consumption of fresh fruits, vegetables and beverages of plant origin (such as herbal teas) can play a preventive role in free radical mediated disorders (e.g. cancer, heart disease, stroke), which is due to a variety of constituents, including vitamins, minerals, fiber and numerous phytochemicals, including polyphenols (Eastwood, 1999; Hertog et al 1995; Bončíková et al et., 2012, Hegedűsova et al 2015, Kvalcová, et al 2015, Timoracká, et al 2010).The health effects of polyphenols depend on the amount that is consumed and on their bioavailability (Manach et al, 2004)
Several epidemiological studies verify that the consumption of fresh fruits, vegetables and beverages of plant origin can play a preventive role in free radical mediated disorders, which is due to a variety of constituents, including vitamins, minerals, fiber and numerous phytochemicals, including polyphenols (Eastwood, 1999; Hertog et al 1995; Bončíková et al et., 2012, Hegedűsova et al 2015, Kvalcová, et al 2015, Timoracká, et al 2010)
Results were evaluated by statistical program Statgraphics 4.0 (Statpoint Technologies, Inc., Czech republic), the data were analyzed by means of one-way analysis of variance (ANOVA) and mutually by regression and correlation analysis

Summary

Introduction

Several epidemiological studies verify that the consumption of fresh fruits, vegetables and beverages of plant origin (such as herbal teas) can play a preventive role in free radical mediated disorders (e.g. cancer, heart disease, stroke), which is due to a variety of constituents, including vitamins, minerals, fiber and numerous phytochemicals, including polyphenols (Eastwood, 1999; Hertog et al 1995; Bončíková et al et., 2012, Hegedűsova et al 2015, Kvalcová, et al 2015, Timoracká, et al 2010).The health effects of polyphenols depend on the amount that is consumed and on their bioavailability (Manach et al, 2004). The strawberry is a relevant source of bioactive compounds because of its high levels of vitamin C, folate, and phenolic constituents (Proteggente et al, 2002), most of which express relevant antioxidant capacities in vitro and in vivo (Scalzo et al, 2005a; Scalzo et al, 2005b; Tulipani et al, 2009; Wang et al, 2000) These properties are mainly attributed to high fruit polyphenolic content, especially anthocyanins – the type of polyphenols quantitatively most important in strawberry fruits – as well as flavonoids, phenolic acids and vitamin C (Roussos et al 2009; Meyers et al, 2003; Olsson et al, 2004; Cordenunsi et al, 2005)

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