Estabilidad de espumas formuladas con proteínas de soja tratadas a pH ácido

Authors

  • Cecilia Abirached Departamento de Ciencia y Tecnología de los Alimentos, Facultad de Química, Universidad de la República, Uruguay
  • Claudia Alejandra Medrano Departamento de Ciencia y Tecnología de los Alimentos, Facultad de Química, Universidad de la República, Uruguay
  • Luis Alberto Panizzolo Departamento de Ciencia y Tecnología de los Alimentos, Facultad de Quimica, Universidad de la República, Uruguay
  • Patrick Moyna Departamento de Ciencia y Tecnología de los Alimentos, Facultad de Química, Universidad de la República, Uruguay
  • María Cristina Añón Centro de Investigación y Desarrollo en Criotecnología de Alimentos, Universidad Nacional de La Plata, Argentina

DOI:

https://doi.org/10.26461/05.10

Abstract

In this work the influence of the acid pH treatment of soy protein isolate on the foaming properties by analysis of the kinetic constants of disproportion and drainage and their relation with the interfacial rheology parameters was studied. Soy protein isolates were obtained from defatted flour. A portion was brought to pH 8.0, another portion was treated at pH 2.0. From the portion treated at pH 2.0 a portion was left at this pH and another was neutralized to pH 8.0. All portions were lyophilized. For the identification and structural characterization of the samples were performed denaturing electrophoresis analysis, differential scanning calorimetry, solubility and surface hydrophobicity. Foams were obtained by the method of gas bubbling. The initial rate of passage of liquid to foam and the maximum volume of fluid incorporated to the foam were determined. The process of destabilization of foams formed was analyzed by fitting the data to a biphasic second-order kinetics. Studies were performed with an interfacial rheology drop tensiometer. Acid pH treatment improved both the foam and foam stability. The proportion of liquid drained by gravity was significantly higher than the drained volume because of the disproportion. Treatment at pH 2.0 reduced the Ostwald disproportion destabilization, suggesting the formation at the interface of a more cohesive film, which is confirmed by the interfacial rheology parameters.

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How to Cite

Estabilidad de espumas formuladas con proteínas de soja tratadas a pH ácido. (2011). INNOTEC, 5 ene-dic, 58-62. https://doi.org/10.26461/05.10

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