SUMMARYIn the last years, there has been an increase in consumption of wine vinegars in Portugal. Thus, the aim of this work was to evaluate the phenolic composition and total antioxidant capacity from several commercial red wine vinegars commercialized in Portuguese market. Several parameters were evaluated: general phenolic composition, chromatic characteristics, individual anthocyanins and phenolic acids by HPLC, and total antioxidant capacity by two methodologies (DPPH and ABTS). For the different parameters analyzed, the red wine vinegars samples studied differed significantly. Vinegars with higher phenolic content tend to have lower lightness, but higher values of the red component color. High diversity of anthocyanins was detected, with some of the vinegars being distinguished by having significantly higher values of anthocyanins compared to the others, as was detected for the generality of the other phenolic parameters. The total antioxidant capacity was positively correlated with the different phenolic parameters. Finally, higher total antioxidant capacity was detected for the phenolic fraction containing anthocyanins and polymeric proanthocyanidins. The results obtained confirm that red wine vinegars are good sources of phenolic compounds and antioxidants. However, there is a great diversity of values for the various red wine vinegars commercialized in the Portuguese market. RESUMONos últimos anos tem ocorrido um aumento do consumo de vinagres de vinho em Portugal. Assim, o objetivo deste trabalho foi avaliar a composição fenólica e a capacidade antioxidante total de diversos vinagres de vinho tinto comercializados no mercado português. Vários parâmetros foram avaliados: composição fenólica geral, características cromáticas, antocianinas individuais e ácidos fenólicos por HPLC, e a capacidade antioxidante total por duas metodologias (DPPH e ABTS). Para os diferentes parâmetros analisados, as amostras de vinagres de vinho tinto estudadas diferiram significativamente. Vinagres com elevado conteúdo fenólico tenderam a ter baixos valores de luminosidade, mas elevados valores da componente vermelha da cor. Elevada diversidade de antocianinas foi detetada, com alguns dos vinagres a poderem ser significativamente distinguidos por apresentarem valores elevados de antocianinas comparativamente com os restantes, tal como foi detetado para a generalidade dos outros parâmetros fenólicos. A capacidade antioxidante total foi correlacionada positivamente com os diferentes parâmetros fenólicos. Finalmente, elevada capacidade antioxidante total foi detetada para a fração fenólica contendo antocianinas e proantocianidinas poliméricas. Os resultados obtidos confirmam que os vinagres de vinho tinto são boas fontes de compostos fenólicos e de antioxidantes. No entanto, existe uma grande diversidade de valores para os vários vinagres de vinho tinto comercializados no mercado português.
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