A Kinetic Description for the Destabilization Process of Protein Foams

Abstract

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Amaranth proteins foaming properties: Film rheology and foam stability – Part 2

“…Adjustment of the obtained experimental data to a biphasic exponential model of first order facilitated the interpretation of the foam destabilization process, separating it into two simultaneous processes: the gravitational drainage and the inter-bubble gas diffusion which lead to disproportionation and collapse of them. This simplification has also been assumed by other authors [15,16], considering these two mechanisms as the main responsible ones for foam destabilization [29]. The model has allowed adjusting the parameter of the drained liquid volume in each process and the speed at which it occurs.…”

“…The foam destabilization phenomenon was interpreted, as other authors have done [15][16][17], as two simultaneous processes. On the one hand, the gravitational drainage of the liquid and on the other hand, the diffusion and collapse drainage.…”

“…The adjustment of the experimental data making use of a biphasic exponential model of first order [15] allowed to determine that less stable foams, obtained as was previously explained at pH 8, had a greater tendency to lose liquid through gravitational drainage, displaying much shorter relaxation times than those corresponding to disproportionation and collapse processes.…”

Effect of Acid Treatment on Interfacial and Foam Properties of Soy Proteins

“…The destabilization kinetics were studied using the k g , k d , V d and V g parameters, which arise from the kinetic model developed by Panizzolo et al [18]:…”

Foaming Properties of Soy Protein Isolate Hydrolysates

“…The maximum value of liquid volume in the foam (V max ) was also determined. The destabilization kinetics was analysed based on the parameters k g , V g , k d and V d resulting from application of the kinetic model developed by [17], where k g , V g , k d and V d are the rate constants and the maximum liquid volumes in the foam associated with gravitational drainage and gas diffusion or disproportionation processes, respectively, the latter also known as Ostwald's ripening. Determinations were based on triplicate measurements of duplicate replicates.…”