Evaluation of the foaming properties of cottonseed protein isolates
2002
Tsaliki, E. | Kechagia, U. | Doxastakis, G.
Cotton is cultivated mainly for fiber production, but it also produces seed which is an important source of proteins for human and animal consumption. In the present work cottonseed protein isolates (CPI) produced either by isoelectric precipitation or dialysis with membranes, where evaluated for their foaming properties. The respective foam ability and stability of the foams produced at pH 6.0 and 7.0, as well as the effect of polysaccharides (xanthan and pollulan) and different concentrations of NaCl, on these properties, were measured. Foam ability was greater at pH 7.0 than at pH 6.0. The addition of xanthan gum 0.1% had a positive effect on foam properties while pollulan had a negative effect. Addition of NaCl increased foam ability and stability at pH 6.0 until the concentration of 0.5 M by increasing the solubility of proteins, while both properties declined at higher concentrations. Surface tension and viscoelastic parameters of absorbed films greatly effected by the CPI production, pHs and concentrations. A close parallelism was observed between foaming properties and the rheological characteristics of the absorbed films.
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