Effect of microwave thawing on microstructure and physicochemical stability of low fat white sauces made with soy protein

Luis M. GuardeÑO, Amparo Quiles, Empar Llorca, José Pertusa and Isabel Hernando
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Luis M. GuardeÑO: Research Group of Food Microstructure and Chemistry, Department of Food Technology, Polytechnic University of Valencia, Valencia, Spain
Amparo Quiles: Research Group of Food Microstructure and Chemistry, Department of Food Technology, Polytechnic University of Valencia, Valencia, Spain
Empar Llorca: Research Group of Food Microstructure and Chemistry, Department of Food Technology, Polytechnic University of Valencia, Valencia, Spain
José Pertusa: Department of Functional Biology and Physical Anthropology, Faculty of Biological Sciences, University of Valencia, Valencia, Spain
Isabel Hernando: Research Group of Food Microstructure and Chemistry, Department of Food Technology, Polytechnic University of Valencia, Valencia, Spain

Czech Journal of Food Sciences, 2013, vol. 31, issue 6, 568-574

Abstract: The microstructural and physicochemical stability of white sauces made with soy protein and modified waxy maize starch was evaluated after subjecting them to a freezing-thawing process in a conventional or microwave oven. The microstructure of sauces revealed a structured matrix of soy protein and starch polymers where fat globules and swollen starch granules remain dispersed. Both thawing methods affected the fat globule size and morphology but they did not affect the starch granules. The SDS-PAGE analysis did not show any apparent changes between sauces thawed by both methods. Moreover, a similar pattern was found in the soy protein isolate used as a raw material indicating that this type of protein was also stable to the cooking process. There were no significant differences (P > 0.05) in the reducing power of the sauces regardless of the thawing method used. However, the acidity index and the k232 parameter were significantly higher (P < 0.05) in conventionally thawed sauces. Finally, syneresis was negligible and no significant differences (P > 0.05) were found among different frozen storage periods. In conclusion, the formulation of the sauce is appropriate to develop low fat, vegetarian meals which can be subjected to frozen storage and microwave reheating.

Keywords: Confocal laser scanning microscopy (CLSM); microwave heating; SDS-PAGE; soy protein isolate; starch (search for similar items in EconPapers)
Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjf:v:31:y:2013:i:6:id:469-2012-cjfs

DOI: 10.17221/469/2012-CJFS

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