En todo el mundo se observa un aumento destacado en el consumo de frutos tropicales. El cultivo de la fruticultura ocupa en Brazil un área de dos millones de hectáreas y genera un PIB de 1,5 billones de dólares. Existen más de 30 puntos de producción, distribuidos en la geografía de norte a sur. La balanza comercial de frutas frescas en Brazil, cerró el año 2003 con un superávit de 267 millones de dólares, un 39% superior al del año anterior. En el
a b s t r a c tThe phenolic compounds content and antioxidant activity of pomace from the vinification of grape varieties widely produced in Brazil (Cabernet Sauvignon, Merlot, Bordeaux and Isabel) were investigated with a view to their exploitation as a potential source of natural antioxidants. Cabernet Sauvignon grape pomace was found to have the highest content of total phenolic compounds (74.75 mg gallic acid equivalent (GAE)/g), the highest antioxidant activity (determined using the 2,2 0 -azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging methods; 485.42 and 505.52 lMol Trolox equivalent antioxidant capacity (TEAC)/g, respectively), and the highest reducing power (determined using the FRAP method; 249.46 lMol TEAC/g). The Bordeaux variety showed the highest oxidation inhibition power (41.13%), determined using the b-carotene/linoleic acid method and the highest content of total anthocyanins (HPLC; 29.17 mg/g). Catechin was the most abundant nonanthocyanic compound identified in the grape pomace (150.16 mg/100 g) for all varieties. In this study, pomaces of the red wine vinification of Cabernet Sauvignon and Bordeaux varieties showed the highest potential as a source of antioxidant compounds and natural colourants, respectively.
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