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

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.

Bibliographic Details

Main Authors:	CAZARIN, C. B. B., 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.
Other Authors:	LUIZ CLAUDIO CORREA, CPATSA; ALINE TELLES BIASOTO MARQUES, CPATSA; GIULIANO ELIAS PEREIRA, CNPUV / CPATSA; ANA CECILIA POLONI RYBKA, CPATSA.
Format:	Separatas biblioteca
Language:	English eng
Published:	2013-05-06
Subjects:	Atividade antioxidante, Isabel, Grape., Análise química, Nutrição, Suco, Uva, Viticultura, Antocianina, Composto Fenólico, Vitis Vinifera.,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/957191
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