Distribution of major polyphenolic compounds in vine grapes of different cultivars growing in South Moravian vineyards.

摘要

The main chemoprotective polyphenolic compounds in berries, rachis and pedicels of 10 winemaking grape cultivars grown 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); and in the freeze-dried rachis and pedicels, rutin (10.5-68.6 mg/kg), isoquercitrine (29.8-218.3 mg/kg), catechin (283.7-2227 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). Contents of polyphenols were different in various cultivars. Highest levels of catechin and epicatechin were found in the grapes of cv. Blauer Burgunder (3195 mg/kg), in which the second highest content of trans-resveratrol (33.2 mg/kg) was also found. Contents of pterostilbene in whole berries or stems was estimated for the first time. The rachis and pedicels could serve as a prospective source of polyphenolic compounds.