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Type: Artigo de periódico
Title: Effects of high pressure on functional properties of soy protein
Author: Torrezan, R
Tham, WP
Bell, AE
Frazier, RA
Cristianini, M
Abstract: Simultaneous measurement of the effects of low soy protein concentration, pH and high pressure treatment at room temperature on solubility, emulsifying properties and rheological properties (loss modulus, G '') of soy protein isolate (SPI) were evaluated. Central composite rotatable designs (2(3)) were employed over two pH ranges (2.66-4.34 and 5.16-6.84) with SPI concentration (0.32-3.68%) and pressure (198-702 MPa) as the other independent variables. The surface responses were obtained for protein solubility, emulsifying activity index (EAI) and G ''. The samples with the highest effect on protein solubility, EAI and G '' values were evaluated, as well, by electrophoresis and free sulphydryl determination. The pH was the main factor that affected protein solubility, with solubility at a maximum at pH < 3 or pH > 6. Increasing SPI concentration and decreasing/increasing the pH away from the isoelectric point both caused a reduction in EAI. Loss modulus (G '') was found to increase with SPI concentration in both pH ranges. (c) 2006 Elsevier Ltd. All rights reserved.
Subject: soy protein isolate (SPI)
high pressure
functional properties
loss modulus
Country: Inglaterra
Editor: Elsevier Sci Ltd
Citation: Food Chemistry. Elsevier Sci Ltd, v. 104, n. 1, n. 140, n. 147, 2007.
Rights: fechado
Identifier DOI: 10.1016/j.foodchem.2006.11.013
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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