Influence of polymer-surfactant interactions on o/w emulsion properties and microcapsule formation.
Influence of polymer-surfactant interactions on o/w emulsion properties and microcapsule formation.
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DOI：
10.1016/j.jcis.2009.10.077
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发表时间：
2010-02
影响因子：
9.9
通讯作者：
Lidija Petrović;V. Sovilj;J. Katona;Jadranka L. Milanović
中科院分区：
文献类型：
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作者：
Lidija Petrović;V. Sovilj;J. Katona;Jadranka L. Milanović
研究了1.00%w/w羟丙基甲基纤维素（HPMC）与阴离子表面活性剂十二烷基硫酸钠（SDS）之间的相互作用对20%w/w向日葵油/水乳液及喷雾干燥法制备的微胶囊性能的影响。的粘度和流变学测量，粒度和粒度分布，和稳定性评估的基础上，得出的结论是，乳液特性强烈依赖于相互作用机制。在0.15 - 1.00%w/v的SDS浓度范围内，观察到粘度和非牛顿触变行为的显著增加，对应于连续相中的HPMC-SDS相互作用。在相互作用区域，通过SDS分子与相邻的HPMC链的分子间结合，在连续相中形成三维网络，这有助于增加粘度和触变性能。乳液粒子的平均直径dvs随SDS浓度的增加而减小，但乳液的稳定性取决于吸附层结构，即HPMC-SDS相互作用。HPMC/SDS复合物吸附在O/W界面上，使膜层更加致密，从而提高乳液稳定性。通过乳液的喷雾干燥以粉末形式获得的微胶囊在水中具有良好的稳定性，但其稳定性取决于HPMC-SDS相互作用机制，即，HPMC/SDS复合物形成更致密的层，其在干燥过程中抗破裂。最高的包封率被发现在相互作用区域。
The aim of this work was to investigate the influence of interactions between 1.00%w/w hydroxypropylmethyl cellulose (HPMC) and the anionic surfactant sodium dodecylsulfate (SDS) on the properties of 20%w/w sunflower oil/water emulsion and the corresponding microcapsules obtained by spray drying technique. On the basis of the viscosity and rheological measurements, particle size and particle size distribution, and stability assessment, it was concluded that the emulsion characteristics depend strongly on the interaction mechanism. Significant increase in viscosity and non-Newtonian thixotropic behavior was observed in the SDS concentration range from 0.15 to 1.00%w/v, corresponding to HPMC–SDS interactions in the continuous phase. In the interaction region, a three-dimensional network is formed in the continuous phase by intermolecular binding of SDS molecules to the adjacent HPMC chains, which contributes to increase in the viscosity and thixotropic properties. The mean diameter of emulsion particles, dvs, decreases with increase in SDS concentration, but emulsion stability depends on the adsorption layer structure, i.e. HPMC–SDS interactions. The HPMC/SDS complex adsorbed at the o/w interface makes the layer more compact, enhancing thus emulsion stability. Microcapsules, obtained in the form of powder by spray drying of emulsions, have good redispersibility in water, but their stability changes depending on the HPMC–SDS interaction mechanism, i.e., the HPMC/SDS complex forms a more compact layer that is resistant to breaking during the drying process. The highest encapsulation efficiency was found in the interaction region.