Departamento de Química-Física, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR) - CONICET, Suipacha 531, Rosario, Argentina.
Departamento de Química-Física, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR) - CONICET, Suipacha 531, Rosario, Argentina; Facultad de Ciencias Veterinarias, UNR, Ovidio Lagos y Ruta 33, Casilda, Argentina; Instituto de Física Rosario (IFIR, CONICET-UNR), 27 de Febrero 210 Bis, Rosario, Argentina.
Carbohydr Polym. 2017 Oct 1;173:1-6. doi: 10.1016/j.carbpol.2017.05.044. Epub 2017 May 17.
Model systems formed by sodium caseinate (NaCAS) and espina corona gum (ECG) were studied. There was no evidence of attractive interactions between NaCAS and ECG macromolecules. Aqueous mixtures of NaCAS and ECG phase-separate segregatively over a wide range of concentrations. According to the images obtained by confocal laser scanning microscopy, NaCAS particles form larger protein aggregates when ECG is present in the system. An increase in the hydrodynamic diameter of NaCAS particles, as a result of ECG addition, was also observed by light scattering in diluted systems. A depletion-flocculation phenomenon, in which ECG is excluded from NaCAS surface, is proposed to occur in the concentrated mixed systems, resulting in NaCAS aggregation. ECG raises the viscosity of NaCAS dispersions without affecting the Newtonian flow behaviour of NaCAS. These results contribute to improve the knowledge of a barely-studied hydrocolloid which may be useful in the development of innovative food systems.
研究了由酪蛋白酸钠（NaCAS）和刺云实胶（ECG）形成的模型体系。没有证据表明 NaCAS 和 ECG 大分子之间存在吸引力相互作用。在很宽的浓度范围内，NaCAS 和 ECG 的水相混合物会发生选择性相分离。根据共聚焦激光扫描显微镜获得的图像，当系统中存在 ECG 时，NaCAS 颗粒会形成更大的蛋白质聚集体。通过光散射在稀释的系统中也观察到，由于添加了 ECG，NaCAS 颗粒的水动力直径增加。在浓混合体系中，可能会发生一种排空-絮凝现象，其中 ECG 被排除在 NaCAS 表面之外，导致 NaCAS 聚集。ECG 会提高 NaCAS 分散体的粘度，而不会影响 NaCAS 的牛顿流动行为。这些结果有助于提高对一种研究甚少的水胶体的认识，这种胶体可能有助于开发创新型食品体系。
