Tropical Isabella grape juices: bioactive compounds and antioxidant power depends on harvest season.

• Autor(a) principal: CAZARIN, C. B. B.
• Data de Publicação: 2013
• Outros Autores: CORREA, L. C., SILVA, J. K. da, BATISTA, A. G., FURLAN, C. P. B., BIASOTO, A. C. T., PEREIRA, G. E., RYBKA, A. C. P., MARÓSTICA JUNIOR, M. R.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
• Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/956317
• topic: Atividade antioxidante; Isabel; Viticultura; Uva; Suco; Nutrição; Análise química; Antocianina; Composto Fenólico

Grapes are important sources of antioxidants compounds and one of the most used varieties to elaborate juices is 'Isabel', or 'Isabella', as it is called in North-America. This study aimed to evaluate the antioxidant activity of Isabella grape juices from the tropical semi-arid climate produced in Brazil on March and September, 2010. Total phenolics and anthocyanins were determined, as well as the antioxidant capacity by DPPH, FRAP and hydrophilic ORAC methods. Test T was used to compare statistical difference at 5% of significance level. As expected, the results showed that the season can play a significant role on phenolics content and antioxidant power. Polyphenols content in juices varied from 82.9 ± 0.92 to 102.2 ± 1.59 mg GAE 100 mL-1 and anthocyanins content ranged from 44.3 ± 2.01 to 129.5 ± 2.82 mg cyanidin-3-glucoside 100 mL-1. Regression analyses showed a high correlation of antioxidant capacity and anthocyanins content. Grapes from Sao Francisco River Valley demonstrated to be a good source of antioxidant for human diet.