Published in Scientific Papers. Series B, Horticulture, Vol. LXVI, Issue 1
Written by Ramona CĂPRUCIU, Daniela Doloris CICHI, Liviu Cristian MĂRĂCINEANU, Dorin Constantin COSTEA
The resveratrol (3,5,4'-trihydroxystilbene) is a phytoalexin belonging to the class of polyphenolic compounds called stilbene, produced in response to stress factors by a wide variety of plants, including Vitis vinifera. This study presents the high performance liquid chromatography (HPLC) system detection of the forms of resveratrol (cis- and trans-) isomers in the skin of the Cabernet Sauvignon and Merlot black grapes from the Șimnicu de Sus wine grape-growing area during the 2019 and 2020 period. The resveratrol isomers were determined throughout the period of maturation of the studied varieties (15 July to 5 September) of the grape berries skin samples. The resveratrol content of grapes skin decreased constantly from the green phase until the full maturity for both varieties, reaching zero for cis-resveratrol (0.043mg/L for Cabernet Sauvignon variety in 2020) in the matured fruits.
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