Milyaeva Olga Yu, Akentiev Alexander V, Bykov Alexey G, Loglio Giuseppe, Miller Reinhard, Portnaya Irina, Rafikova Anastasiya R, Noskov Boris A
Department of Colloid Chemistry, St. Petersburg State University, Universitetsky pr. 26, 198504 St. Petersburg, Russia.
Institute of Condensed Matter Chemistry and Energy Technology, 16149 Genova, Italy.
Langmuir. 2023 Oct 31;39(43):15268-15274. doi: 10.1021/acs.langmuir.3c01950. Epub 2023 Oct 22.
The dynamic surface properties of native κ-casein solutions and aqueous dispersions of its fibrils differ significantly from the corresponding properties of the systems with globular proteins. The dependence of the dynamic surface elasticity of κ-casein solutions on surface pressure has a local maximum, indicating partial displacement of macromolecules from the proximal region of the surface layer to the distal one. This dependence becomes monotonic for fibril dispersions, similar to the results for dispersions of globular protein fibrils, but unlike the latter case, the surface elasticity close to the steady state reaches values that are approximately four times higher than the data for native protein solutions at the same concentrations.
天然κ-酪蛋白溶液及其原纤维水分散体的动态表面性质与球状蛋白质体系的相应性质有显著差异。κ-酪蛋白溶液的动态表面弹性对表面压力的依赖性存在一个局部最大值，这表明大分子从表面层的近端区域部分位移到远端区域。对于原纤维分散体，这种依赖性变得单调，类似于球状蛋白质原纤维分散体的结果，但与后者不同的是，接近稳态时的表面弹性达到的值比相同浓度下天然蛋白质溶液的数据高约四倍。
