Grape juices produced from new hybrid varieties grown on Brazilian rootstocks - Bioactive compounds, organic acids and antioxidant capacity.
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The objective of this study was to assess the content of bioactive compounds, organic acids and antioxidantcapacity of grape juices from Isabel Precoce, BRS Carmem, BRS Cora and IAC 138-22 Máximo varieties grown onthe 'IAC 766?and 'IAC 572?rootstocks under tropical conditions in Brazil. In general, the color attributes of the'Isabel Precoce' juice were inferior to those of the other juices due to their low anthocyanin content. In contrast,'IAC 138-22 Máximo' juices showed the highest content of most individual anthocyanins,flavonols,trans-re-sveratrol and total phenolic compounds, and thus, higher antioxidant capacity. Except for 'BRS Carmem', all thejuices presented higher sugar accumulation when 'IAC 766?was used. This rootstock also contributed to theaccumulation oft-resveratrol and most of individual anthocyanins in the 'IAC 138-22 Máximo' juices. However,the monomeric anthocyanin content was higher in 'BRS Carmem' juices when 'IAC 572?rootstock was used.
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Vitis labruscaL, Hybrid grapes, Scion-rootstock combination, Color measurements, Phenolic compounds, Resveratrol