Characterisation of (poly)phenolic constituents of two interspecific red hybrids of Rondo and Regent (Vitis vinifera) by LC-PDA-ESI-MS QTof.

The aim of this study was to identify and compare phenolic acids, flavan-3-ols, flavonols, and anthocyanins in two the most popular interspecific hybrids of red grapes, Rondo and Regent, nowadays very popular in red wine production in Poland. The phenolic profiles of these hybrids have not yet been reported. Thirty-three phenolic compounds, including 2 flavan-3-ols, 3 phenolic acids, 5 flavonols, and 23 anthocyanins, were determined in the examined samples using the ultra-performance liquid chromatography photodiode detector-quadrupole/time of flight-mass spectrometry (UPLC-PDA-Q/TOF-MS) method. Major differences were found in the phenolic profiles of investigated cultivars. The Regent hybrid exhibited the highest total phenolics content (27029.75mg/kg dry matter) but Rondo was characterized by the highest concentration of anthocyanins (19342.36mg/kgdm). The dominant fraction was anthocyanin compounds, especially acetylated>diglucosylated forms than glucosylated ones. This data represents valuable information that may be useful for oenological practices and to valorise these varieties as sources of bioactive compounds.