Ovalbumin thermal gelation prediction by application of temperature-time history

A model for characterizing changes in viscosity of soy protein during extrusion was adapted to predict apparent viscosity ratio of gelling ovalbumin. For ovalbumin (87% purity) the temperature time histories of 3, 5, and 7% gel formation were determined at 85, 90 and 95 degrees C. A back-extrusion m...

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Veröffentlicht in:Journal of food science 1992-09, Vol.57 (5), p.1093-1098
Hauptverfasser: Harte, J.B. (Michigan State Univ., East Lansing, MI), Zabik, M.E, Ofoli, R.Y, Morgan, R.G
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Sprache:eng
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Zusammenfassung:A model for characterizing changes in viscosity of soy protein during extrusion was adapted to predict apparent viscosity ratio of gelling ovalbumin. For ovalbumin (87% purity) the temperature time histories of 3, 5, and 7% gel formation were determined at 85, 90 and 95 degrees C. A back-extrusion method was used to determine apparent viscosity ratios during gelation. Activation energy for denaturation/gelation was estimated at 159 kJ/mol. The model parameter a (degree of molecular entanglement) was 0.75, 0.75, and 1.0 for 3, 5, and 7% gels, respectively. Reaction rate constants were similar for samples with different protein concentrations. Maximum apparent viscosity ratio increased as protein concentrations increased. The mathematical model was verified by determining apparent viscosity ratios at 86 and 93 degrees C and water holding at 90 degrees C, resulting in R(2)-0.93. This model may be useful in predicting ovalbumin thermal gelation apparent viscosity ratios
ISSN:0022-1147
1750-3841
DOI:10.1111/j.1365-2621.1992.tb11271.x