Distribution of major polyphenolic compounds in vine grapes of different cultivars growing in South Moravian vineyards
Mikes, O.,Mendelova Zemedelska a Lesnicka Univ., Lednice (Czech Republic). Ustav Vinohradnictvi a Vinarstvi | Vrchotova, N.,Akademie Ved, Ceske Budejovice (Czech Republic). Ustav Systemove Biologie Ekologie | Triska, J.,Akademie Ved, Ceske Budejovice (Czech Republic). Ustav Systemove Biologie Ekologie | Kyselakova, M.,Mendelova Zemedelska a Lesnicka Univ., Lednice (Czech Republic). Ustav Vinohradnictvi a Vinarstvi | Smidrkal, J.,Vysoka Skola Chemicko-technologicka, Prague (Czech Republic). Ustav Technologie Mleka a Tuku
The main chemoprotective polyphenolic compounds in the Vitis vinifera berries, rachis, and pedicels of 10 cultivars classified for the production of wine and growing in Southern Moravian vineyards, Czech Republic, were studied. The following compounds were determined in the frozen fresh berries: gallic acid (1.8-13.3 mg/kg), catechin (70.3-659.1 mg/kg), epicatechin (67.1-237.2 mg/kg), trans-resveratrol (0.1-1.5 mg/kg), and pterostilbene (in traces); in the freeze-dried rachis and pedicels: rutin (10.5-68.6 mg/kg), isoquercitrine (29.8-218.3 mg/kg), catechin (283.7-2,227 mg/kg), epicatechin (47.2-215.2 mg/kg), trans-resveratrol (2.6-37.1 mg/kg), and pterostilbene (0.01-0.13 mg/kg), respectively. The concentrations of polyphenolic compounds were different in various cultivars. The highest levels of catechin and epicatechin were found in the grapes of cv. Blauer Burgunder (3,195 mg/kg), in which the second highest content of trans-resveratrol (33.2 mg/kg) was also found.
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