THE VITIS LABRUSCA (FOX GRAPE) FAMILY’S REDGRAPE SEED EXTRACTS AND LIQUID CONCENTRATES
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Abstract
The skin and seeds of red grapes varieties of the Vitis labrusca (Fox Grape) family are environmentally friendly raw materials for the production of strong antioxidant, polyphenolic concentrates, because no pesticides and various chemical agents are used in their cultivation.
The aim and objectives of our scientific studies were to determine the uvological characteristics of red grapes raw materials of the Vitis labrusca (Fox Grape) family’s vine varieties "Zeibel 5455", "Ojaleshi" and "Jvarisula" growing in the viticulture-winemaking zone of Imereti (Georgia) and study of phenolic compounds, flavonoids, catechins, leucoanthocyanins, cations of mineral substances and antioxidant activity of liquid hydrophilic concentrates containing 65–67% dry matter.
We used modern methods of gravimetric, extraction, spectral and chromatographic research.
Scientific studies have shown that all three grape-seed concentrates contain large amounts of phenolic compounds, potassium, calcium and magnesium cations, and are characterized by high antioxidant activity (49.8% – Zeibel 5455 seed concentrate; 51.5% – Ojaleshi seed concentrate; and 50.2% – Jvarisula seed concentrate).
The research is of practical importance, because the developed strong antioxidant, polyphenolic grape seed concentrates are the best raw materials for the production of functional food supplements.
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