摘要
采用轴对称滴形分析法研究了大豆球蛋白吸附在空气-水界面上的界面流变特性,主要检测了在有代表性的浓度和pH值条件下其表面张力和表面膨胀特征参数随吸附时间的变化。试验表明,随着吸附时间的延长,大豆球蛋白吸附在空气-水界面上的表面张力降低,膨胀模量增大而相角减小,这主要与蛋白质在界面上的吸附、展开和(或)蛋白质间的相互作用有关。大豆球蛋白在空气-水界面上的吸附随着初始体相蛋白浓度的增加而加快,受体相pH值的影响很大。从流变学的角度分析,大豆球蛋白吸附到空气-水界面上所形成的粘弹性的吸附膜实际上是弹性的。
Interfacial rheological properties of soy glycinin adsorbed at the air-water interface were studied by axisymmetric drop shape analysis. Changes of surface tension and surface dilatational characteristic parameters with adsorption time were determined at the representative concentration and pH value. The results showed that the surface tension and phase angle decreased, and surface dilatational modulus increased with adsorption time, which was related to protein adsorption, unfolding and/or protein-protein interactions at the interface. Adsorption of soy glycinin at the air-water interface increased with the increasing protein concentration in the initial bulk phase, and depended especially on the pH value. Soy glycinin adsorbed at the air-water interface formed viscoelastic adsorbed films, from the view of rheological point, which were actually elastic.
出处
《陕西科技大学学报（自然科学版）》
2006年第3期22-27,共6页
Journal of Shaanxi University of Science & Technology
基金
广东省"十五"攻关农产品加工重大专项(A20301)
关键词
大豆球蛋白
空气-水界面
表面张力
表面膨胀模量
soy glycininl air-water interface
surface tension
surface dilatational modulus
