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Type: Artigo de periódico
Title: Steady and dynamic shear rheological properties of acai pulp (Euterpe oleraceae Mart.)
Author: Tonon, RV
Alexandre, D
Hubinger, MD
Cunha, RL
Abstract: The aim of this work was to study the theological behavior of acai Pulp at different temperatures (10, 25, 40, 55 and 70 degrees C) under steady and dynamic shear conditions. The measurements were carried out using a stress-controlled rheometer with stainless steel plate-plate geometry and smooth or grooved surfaces. In the tests performed with smooth surface geometry, the slip effect was shown at low shear rates under steady and dynamic shear conditions, while the use of grooved surface geometry minimized this effect. At any given temperature, the acai pulp showed shear thinning behavior with yield stress in the steady shear Measurements. However, an increase in temperature led to an increase in thixotropy and a decrease in yield stress. In addition, the acai Pull) Viscosity at 100 S (1) showed Arrhenius type temperature dependence, with activation energies of 4.18 and 6.21 kJ/mol for smooth and grooved Surfaces, respectively, With respect to the dynamic shear measurements, the acai pull) showed weak gel-like behavior, and the storage and loss moduli decreased with increasing temperatures. (c) 2009 Elsevier Ltd. All rights reserved.
Subject: Thixotropy
Slip effect
Yield stress
Activation energy
Particulate system
Country: Inglaterra
Editor: Elsevier Sci Ltd
Citation: Journal Of Food Engineering. Elsevier Sci Ltd, v. 92, n. 4, n. 425, n. 431, 2009.
Rights: fechado
Identifier DOI: 10.1016/j.jfoodeng.2008.12.014
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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