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Type: Artigo de periódico
Title: Rheological behavior of blueberry
Author: Antonio, GC
Faria, FR
Takeiti, CY
Park, KJ
Abstract: The physical and physicochemical characteristics of blueberry (Vaccinium myrtillus) fruits produced in Brazil were analyzed. Rheological properties were measured at 5, 25, 45 and 65 degrees C, on a stress controlled rheometer equipped with grooved a stainless-steel parallel-plate in a shear rate range of 0-300 s(-1), with the objective of determining the influence of temperature on the rheological properties. The pseudoplastic behavior with yield stress was well described by the Ostwald-de-Waele (Power Law), Herschel-Bulkley (HB) and Mizhari Berk models. The yield stress and behavior index decreased with the increase in the temperatures for 5, 25, and 45 degrees C whereas for the temperature of 65 degrees C the effects were the opposite exhibiting elevated values. The viscosity decreased with an increase in temperature, and the Arrhenius equation described adequately the effect of temperature on the apparent viscosity of the puree, in which the activation energy (Ea) determined at a shear rate of 100 s(-1) was 9.36 kJ.mol(-1).
Subject: fruit
rheological equation
activation energy
Country: Brasil
Editor: Soc Brasileira Ciencia Tecnologia Alimentos
Citation: Ciencia E Tecnologia De Alimentos. Soc Brasileira Ciencia Tecnologia Alimentos, v. 29, n. 4, n. 732, n. 737, 2009.
Rights: aberto
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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