Study of the evolution of polyphenolic content and antioxidant activity of local grape varieties at different maturation periods
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2022-07-28 09:57
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[634.8+663.2]:577.11 (1)
Viticultură. Viță de vie. Vii (621)
Vin. Producerea vinului. Oenologie (442)
Bazele materiale ale vieții. Biochimie. Biologie moleculară. Biofizică (657)
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VICOL, Crina, MORARI, Boris, TARAN, Nicolae, DUKA, Gh.. Study of the evolution of polyphenolic content and antioxidant activity of local grape varieties at different maturation periods. In: Ecological and environmental chemistry : - 2022, Ed. 7, 3-4 martie 2022, Chișinău. Chisinau: Centrul Editorial-Poligrafic al USM, 2022, Ediția 7, Vol.1, p. 162. ISBN 978-9975-159-07-4.. 10.19261/eec.2022.v1
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Ecological and environmental chemistry
Ediția 7, Vol.1, 2022
Conferința "Ecological and environmental chemistry 2022"
7, Chișinău, Moldova, 3-4 martie 2022

Study of the evolution of polyphenolic content and antioxidant activity of local grape varieties at different maturation periods

CZU: [634.8+663.2]:577.11

Pag. 162-162

Vicol Crina1, Morari Boris2, Taran Nicolae2, Duka Gh.1
 
1 Institute of Chemistry,
2 Practical Scientific Institute of Horticulture and Food Technology
 
Proiecte:
 
Disponibil în IBN: 16 martie 2022


Rezumat

According to NBS [1], 462 thousand tons of grapes were cultivated in Republic of Moldova in 2020. Internal grape products are estimated annually at 450 - 500 million US dollars, which is an important contribution to the country‘s budget [2]. On the other hand, in 2019, in Republic of Moldova were produced 178 thousand tons of wine, this ranking the country the 10th in Europe for winemaking [3]. Almost 80% of wines were exported, this representing the highest percent registered in the region [3]. This is a good indicator that confirms the high quality of Moldovan grape production and the important development that was achieved in grape and winemaking industry. Grapes are excellent sources of various classes of polyphenols like phenolic acids, anthocianins, proanthocyanidins and stilbenes, each distributed differently within the grape tissues. At different maturation periods the content of different classes of compound varies significantly. For examples the anthocianins, which are the principal phenolic compounds responsible for the color in red grapes, accumulate in ripe berries. On the other hand, the proanthocyanidins accumulate in the pulp of unripe berries and then garner in the seeds during the veraison and ripening. The accumulation of these groups of compound in grapes is highly desirable due to their antioxidant activity [4] and to the beneficial effects of grapes on human health. The present research reports the observations related to the evolution of the phenolic content and of the antioxidant activity of four grape varieties: Riton and Viorica – white grapes, and Feteasca Neagră and Copceac – red grapes. These are local grape varieties of new selection, characteristic for Republic of Moldova, this fact implying a big scientific and industrial interest. In order to study the dynamics of particular groups of compounds the sampling and the analysis were performed in unripen grapes, at the veraison and in ripe grapes. Three suitable extraction technics were used in order to ensure the maximum extraction of a specific group of compounds. The total phenolic content, the proanthocyanidins content, the anthocyanins content and the antioxidant activity was determined, and the correlation between this data was defined.