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The occurrence and content of some polyphenols and theantioxidant activity of compounds present in grape berries,stems and leaves of Vitis vinifera L. were evaluated. Threewhite and three blue varieties of grapevine were investigated.The contents were determined of trans-resveratrol,trans-piceid, caftaric acid, tryptophan, catechin, epicatechin,total polyphenols, and flavanols, both in healthy material andin the samples of the plant material infested withmicroorganisms (Botryotinia fuckeliana Whetzel anamorphBotrytis cinerea Pers.; Uncinula necator (Schw.) Burr;Plasmopara viticola (Berk. & M.A. Curtis) Berl & De Toni). Theantioxidant activity of the extracts obtained was determined bydifferent methods: FRAP (Ferric Reducing Antioxidant Power),DPPH (2,2-diphenyl-1-picrylhydrazyl radical) and TAC-PCL (TotalAntioxidant Capacity of Photochemiluminescence). The content oftrans-resveratrol varied between 0.3-2.3 mg/kg and 0.7-12.1mg/kg in non-infested and infested grape berries, respectively.The content of trans-piceid between 0.6-2.9 mg/kg and 1.5-6.3mg/kg in non-infested and infested grape berries, respectively.The content of trans-resveratrol varied between 2.5-10.3 mg/kgand 3.7-20.9 mg/kg in healthy and in infected leaves,respectively. The content trans-piceid varied between 11.3-58.4mg/kg and 18.5-60.9 mg/kg in the healthy and in the infectedleaves, respectively. The highest content of trans-resveratrolwas found in stems (16.3-276.3 mg/kg). In young lateral shoots,the highest levels of trans-piceid (12.6-99.7 mg/kg) andcaftaric acid (474-2257 mg/kg) were determined. The infestedgrape berries showed a higher antioxidant activity, which wasmost closely correlated with the content of total polyphenols(correlation coefficient = 0.8336-0.9952).

Relations between polyphenols content and antioxidant activity in vine grapes and leaves