PHENOLIC CONTENT AND ANTIOXIDANT ACTIVITY OF SLOVAK VARIETAL WINES OF MUSCAT TYPE

Abstract

Grapes and wine are important sources of antioxidants in human diet. Phenolic substances contained in grapevine berries belong to an important group of natural substances that get into wine in the process of wine making. Polyphenols and flavonoids are primarily accountable for the colour and taste of the wine, they affect the perception of bitterness and acerbity. They also have antioxidant properties, thus have a positive effect on human health. Health benefits of polyphenolic substances from wine may be associated with a wide range of biological processes. Thanks to the development of modern analytical methods, wine is constantly being researched in terms of the content of antioxidants, and its importance to human health. Sixteen Slovak white wines of Muscat type produced in different geographical regions were analysed in this study. The object of this work was to determine total polyphenol content and total flavonoid content, and to evaluate antioxidant effects of quality wines of Muscat varieties produced in Slovakia. Antioxidant activity, total polyphenol content, and total flavonoid content of particular wines is described in the study. Studied characteristics were analysed by UV-VIS spectrometry method. Muscat wines showed weak to high antioxidant activity, ranging from 25.2% inhibition of DPPH to 67.7% inhibition of DPPH. Average antioxidant activity was 38.7% inhibition of DPPH. Total polyphenol content in the Muscat type varietal wines varied from 262.1 GAE.L-1 to 568.3 GAE.L-1. Average total polyphenol content was 382.13 GAE.L-1. The content of total flavonoids in Muscat type varietal wines ranged from 24.8 mg CE.L-1 to 169.1 mg CE.L-1. Average total flavonoid content was 100.5 mg CE.L-1.