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Effects of high pressure on functional properties of soy protein

Torrezan, R., Tham, W.P., Bell, A., Frazier, R. ORCID: https://orcid.org/0000-0003-4313-0019 and Cristianini, M. (2007) Effects of high pressure on functional properties of soy protein. Food Chemistry, 104 (1). pp. 140-147. ISSN 0308-8146

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To link to this item DOI: 10.1016/j.foodchem.2006.11.013

Abstract/Summary

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.

Item Type:Article
Refereed:Yes
Divisions:Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences > Food Research Group
Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences
ID Code:12949
Uncontrolled Keywords:soy protein isolate (SPI), high pressure, functional properties, pH, loss modulus, EMULSIFYING PROPERTIES, FOOD PROTEINS, GELS
Publisher:Elsevier

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