空气/水界面上大豆11S球蛋白吸附膜的膨胀特性

Dilatational Properties of Soy 11S Globulin Adsorption Films on Air-Water Interface

采用轴对称滴形分析法检测了不同体相蛋白含量和pH值条件下,空气/水界面上大豆11S球蛋白吸附膜的表面膨胀特征参数随吸附时间的变化.结果表明:随着吸附时间的延长,吸附膜的表面膨胀模量增大,相角减小;膨胀弹性明显高于膨胀粘性,因此,从流变学的角度分析,空气/水界面上大豆11S球蛋白吸附膜的粘弹性实际上是弹性的;表面膨胀模量随体相蛋白浓度的增加而增大,受pH值的影响更为明显.

The variation of surface dilatational characteristic parameters with adsorption time for soy 11 S globulin adsorption films on air-water interface was measured by the axisymmetric drop-shape analysis, as a function of protein concentration and pH value in the bulk phase. The results indicate that, with the increase of adsorption time, the surface dilatational modulus increases, while the phase angle decreases. Moreover, the dilatational elasticity of the soy 11 S globulin films adsorbed on air-water interface is greater than the dilatational viscosity. Thus, in view of rheology, the viscoelastic adsorption films are practically elastic. In addition, the surface dilatational modulus increases with the bulk protein concentration, especially depends on the pH value.