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Evaluation of Bioactive Phenols in Blueberries from Different Cultivars.

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Summary:Blueberries are widely valued for their high content in phenolic compounds with antioxidant activity, and hence beneficial for the human health. In this way, a study was done to determine the phenolic composition (total phenols, anthocyanins and tannins) and antioxidant activity of blueberries from three cultivars (Duke, Bluecrop, and Ozarkblue) grown in two different Portuguese farms. Initially two successive extractions were done with methanol followed by two extractions with aqueous acetone solutions. These extracts obtained were then used to evaluate the amount of phenolic compounds and the antioxidant activity. The total phenols were observed to vary from 4.9 to 8.2 mg GAE/g fresh weight, with anthocyanin’s contents in the range 1.5-2.8 mg EMv3G/g and tannins contents in the range 1.5- 3.8 mg/g. The results for antioxidant activity ranged from 9.3 to 23.2 molTE/g and from 24.7 to 53.4 molTE/g, when measured, respectively, by DPPH and ABTS methods. In conclusion it was observed that, in general, the cultivar had a visible effect on the phenols present, and furthermore, the geographical origin showed relevance either in the phenols contents or the antioxidant activity.
Main Authors:Gonçalves, Christophe
Other Authors:Guiné, Raquel; Teixeira, Daniela; Gonçalves, Fernando
Subject:antioxidant activity anthocyanins blueberry phenolic compounds
Year:2015
Country:Portugal
Document type:article
Access type:open access
Associated institution:Instituto Politécnico de Viseu
Language:English
Origin:Repositório Científico do Instituto Politécnico de Viseu

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