ALTERNATIVES FOR PRESERVATION OF BIOACTIVE COMPOUNDS IN BLUEBERRY PULP: HEAT TREATMENT ASSOCIATED WITH THE ADDITION OF XANTHAN PRUNI

ABSTRACT In this study, to increase the preservation of phenolic bioactive compounds and antioxidant activity in blueberry pulp, heat treatment associated with addition of xanthan gum was used. A commercial mixture of blueberries (Powerblue, Climax and Bluegen cultivars) was added with 0.08% (w/w) c...

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Published in:Revista Brasileira de Fruticultura Vol. 39; no. 3
Main Authors: FIORAVANTE, JÚLIA BORIN, SOUZA, VANESSA RODRIGUES DUARTE DE, RODRIGUES, ROSANE DA SILVA, DIAZ, PATRÍCIA DE OLIVEIRA, MOREIRA, ANGELITA DA SILVEIRA
Format: Journal Article
Language:English
Published: Sociedade Brasileira de Fruticultura 07-08-2017
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Summary:ABSTRACT In this study, to increase the preservation of phenolic bioactive compounds and antioxidant activity in blueberry pulp, heat treatment associated with addition of xanthan gum was used. A commercial mixture of blueberries (Powerblue, Climax and Bluegen cultivars) was added with 0.08% (w/w) citric acid and subjected to heat treatment by direct heating until 90 °C in conventional open pan (OP) and by direct application of steam (AS); both with and without the addition of xanthan pruni (OPX and ASX), followed by pulping. Samples of only frozed fruits were considered as control. The five treatments remained under freezing and were evaluated until 90 days of storage for antioxidant activity, phenols, flavonoids and total monomeric anthocyanins. The results show that, with the exception of phenolics, heat treatment with direct steam application and xanthan addition favored bioactive compounds preservation during storage. These factors influenced positively on the anthocyanins stability during frozen storage for 90 days. The xanthan addition favored antioxidant activity preservation; preservation for antioxidant activity by ABTS and DPPH, in all heat treatments, was observed. RESUMO Neste estudo, objetivou-se aumentar a preservação de compostos bioativos fenólicos e atividade antioxidante em polpas de mirtilo, foi utilizado o tratamento térmico associado à adição de xantana pruni. Uma mistura comercial de mirtilos (cultivares Powerblue, Climax e Bluegen) foi adicionada com 0,08% (m/m) e ácido cítrico e foi submetida a tratamento térmico por aquecimento direto até 90 ° C em tacho aberto convencional (OP) e por aplicação direta de vapor (ASX); com e sem a adição de xantana pruni (OPX e ASX). Amostras de frutas congeladas foram consideradas como controle. Os cinco tratamentos permaneceram sob congelamento e foram avaliados até 90 dias de armazenamento para atividade antioxidante, fenóis, flavonóides e antocianinas monoméricas totais. Os resultados mostram que, com exceção de fenólicos, o tratamento térmico com aplicação de vapor direto e adição de xantana pruni favoreceu a preservação dos compostos bioativos durante o armazenamento. Esses fatores influenciaram positivamente a estabilidade das antocianinas durante o armazenamento congelado por 90 dias. A adição de xantana nos tratamentos térmicos favoreceu a preservação da atividade antioxidante para os dois métodos (ABTS e DPPH).
ISSN:0100-2945
1806-9967
0100-2945
DOI:10.1590/0100-29452017541