Abstract
Sixteen Alibernet wine samples, originated from three most important Slovak vineyard regions, were evaluated spectrophotometrically for the content of total polyphenols, content of total anthocyanins, antioxidant activity and wine colour density. The determined total polyphenol contents in observed wines ranged from 2141 to 4274 mg gallic acid per liter (average content was 3057 mg gallic acid/L) and total anthocyanin contents ranged from 73.4 to 791.2 mg/L (average content was 403.4 mg/L). Determined values of antioxidant activity were within the interval 54.8 – 86.8% (average value was 74.5%) and the values of wine colour density varied between 0.944 and 4.592 (average value was 2.317). The statistical evaluation of the obtained results confirmed only weak linear correlation between total polyphenol content and total anthocyanin content, however strong linear correlations between total anthocyanin content and antioxidant activity, resp. wine colour density were observed. Our results also confirmed very highly significant linear relationship between wine colour density and total polyphenol content, resp. antioxidant activity and between antioxidant activity and total phenolic content.
Highlights
In recent years healthy effects of moderate consumption of wine have been discussed by scientific as well as laic community
The average content of total polyphenols in wines – Alibernet is much higher than we found out in the other three major Slovak varietal red wines Blaufränkisch - 2003 mg gallic acid equivalent (GAE)/L, Saint Laurent - 2297 mg GAE/L and Cabernet Sauvignon - 2407 mg GAE/L (Bajčan et al, 2012a,b)
Our results are slightly lower than results reported by Slezák (2007) and Čižmárová (2009), who found out the content of Total polyphenol (TP) in slovak wines - Alibernet in range from 2865 to 5340 mg GAE/L
Summary
In recent years healthy effects of moderate consumption of wine have been discussed by scientific as well as laic community. Polyphenolic compounds are very monitored and discussed group of antioxidants in wine that exert bio-protective effects and have strongly positive effect on human health. Their importance is in reducing of cardiovascular and carcinogenic diseases incidence (Slezák, 2007). Plant polyphenols are amorphous substances occurring almost in all plants, especially in leaves, flowers, seeds, fruits, in pathologic formations, as well as in products of plant origin, honey, propolis and wine They are present mainly in form of conjugates of saccharides molecules in plants, with one or more phenolic molecules or they occur in form of functional derivatives, such as esters or metylesters (Balasundram et al, 2006; Vollmanová et al 2009; Timoracká, 2010).
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