Antioxidant properties, total phenolic and total flavonoid content of the Slovak white wines - welschriesling and chardonnay

Abstract

The biologically active compounds in wines, especially phenolics, are responsible for reduced risk of developing chronic diseses (cardiovascular diseases, cancer, diabetes, Alzheimer disease, etc.), due to their antioxidant activities. Twenty six Slovak white wines, produced from different geographical origins, were examined in this study. The antioxidant activity, total phenolic and flavonoid contents of two types monovarietal wines -Welschriesling and Chardonnay were evaluated. All three mentioned parameters were determined by UV-VIS absorption spectrometry. The results showed that both types of Slovak white wines were high in polyphenols (average content was 303.2 mg GAE.L -1 in Welschriesling, resp. 355.6 mg GAE.L -1 in Chardonnay) and flavonoids (average content was 51.9 mg CE.L -1 in Welschriesling, resp. 60.1 mg CE.L -1 in Chardonnay), as well as a high antioxidant activity (average value was 35.0% inhibition of DPPH in Welschriesling, resp. 43.3% inhibition of DPPH in Chardonnay), comparable to the wines produced in other regions in the world. Among the white wines, Chardonnay had higher content of total polyphenols, as well as flavonoids and higher values of antioxidant activity. Our results confirmed very strong linear correlations between all three analysed parameters (TPC, TFC and AA): TPC and TFC (r = 0.818), AA and TPC (r = 0.699), resp. TFC and AA (r = 0.693).

Chemical Composition of White Wines Produced from Different Grape Varieties and Wine Regions in Slovakia

“…In comparison with the chardonnay wines from Montenegro (TPC 226 mg GAE L −1 ) [47], the content in Slovak chardonnay wines was higher in more than 100 mg GAE L −1 . Our results are also in agreement with experiments by Bajčan et al [30] and Čéryová et al [31], who examined the antioxidant activity, total phenolic and flavonoid contents in monovarietal wines of Welschriesling, chardonnay. According to their results, Slovak white wines were high in polyphenols (average content was 303.2 mg GAE.L−1 in Welschriesling, resp.…”

“…In our study, all wines presented relatively high values for the antioxidant activity, ranged between 51.06 and 72.53% of inhibition of DPPH (average: 63.30% for chardonnay, 58.62% for pinot blanc and 64.45 for pinot gris wines). Our results for antioxidant activity were correlated with previously published data for white wines [30,31,48]. According to several studies, polyphenolic compounds have shown a different behaviour towards DPPH free radical, both in terms of capacity and rate of scavenging [49,50].…”

“…During the last decade many studies have been performed in the analysis of phenolic compounds in wines, as well as organic acids and sugars. With regard to Slovak white wines, limited data on the total phenolics and antioxidant properties are available [30][31][32]. By current knowledge, there is no similar survey of white wines in Slovakia that reports such a comparison of white wine varieties according to potential chemical descriptors in relation to geographic origin.…”

Phenolic Compounds and Antiradical Activity in Tokaj Wines

“…Many of these compounds have been reported to have multiple biological activities, including cardioprotective, anti-carcinogenic, antiviral, antidegenerative and antibacterial properties (Bystrická et al, 2014;King et al, 2006;Santos-Buelga and Scalbert, 2000). In previous studies, we described some antioxidant properties, such as total polyphenol content, total flavonoid content, total anthocyanin content and antioxidant activity of the Slovak monovarietal red (Bajčan et al, 2012a,b; and white (Bajčan et al, 2017) wines originating in different vineyard areas, excluding Tokaj wine region. Tokaj wine region lies in the Lower Zemplín in the south-eastern corner of Slovakia.…”