Author(s): 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.

Summary: 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.

Publication year: 2013

Types of publication: Journal article

Unit: Embrapa Semi-arid Region

Keywords: Antocianina, Análise química, Atividade antioxidante, Composto Fenólico, Grape, Isabel, Nutrição, Suco, Uva, Viticultura, Vitis Vinifera