Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2021-09-13 , DOI: 10.1016/j.jcis.2021.09.056 Shengnan Tao 1 , Xin Guan 2 , Yunxing Li 1 , Hang Jiang 1 , Suijing Gong 1 , To Ngai 2
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Hypothesis
Synergistic stabilization of high internal phase Pickering emulsions (HIPPEs) by food-grade colloidal particles are necessary for food, pharmaceuticals or cosmetics owing to their biocompatibility and multi-functionality. By tuning the interfacial structure of adsorbed binary particles, the HIPPE may exhibit extraordinary characteristics compared to conventional all-natural HIPPEs solely stabilized by single-component particle or composite particle, which should have potential applications in varies fields.
Experiments
HIPPEs were prepared by using zein protein nanoparticles (ZNPs) and starch nanocrystals (SNCs) as stabilizers. We systematically investigated the effect of particle concentration and internal phase fraction on HIPPEs morphology, stability and rheological behaviors. Further, the stabilization mechanism as well as potential applications were demonstrated.
Findings
HIPPEs were prepared with excellent stability against centrifugation and high temperature (50 °C). Our result indicates the successful construction of unique bilayer interfacial structures consisting of inner ZNPs layer and outer SNCs layer. Since SNCs could gelatinize at 50 °C, dense shells can form around droplets afterwards. Such thermally responsive interfacial structures can be used to protect hydrophobic bioactive substances at higher temperatures while still allowing controlled release at certain conditions. Furthermore, with high internal phase fraction, HIPPEs can possibly replace mayonnaise and salad dressing on the market due to comparable appearance and properties. Following the removal of inner oil, porous materials can be further fabricated, which have potential applications in environmental protection or tissue engineering.
中文翻译：
具有界面双层稳定性的全天然水包油高内相 Pickering 乳液
假设
由于其生物相容性和多功能性，食品级胶体颗粒对高内相 Pickering 乳液 (HIPPE) 的协同稳定对于食品、药物或化妆品是必不可少的。通过调整吸附二元颗粒的界面结构，与仅由单组分颗粒或复合颗粒稳定的传统全天然 HIPPE 相比，HIPPE 可能表现出非凡的特性，在各个领域都有潜在的应用。
实验
HIPPEs 是通过使用玉米醇溶蛋白纳米粒子 (ZNPs) 和淀粉纳米晶体 (SNCs) 作为稳定剂制备的。我们系统地研究了颗粒浓度和内相分数对 HIPPE 形态、稳定性和流变行为的影响。此外，还展示了稳定机制以及潜在的应用。
发现
制备的 HIPPE 对离心和高温 (50 °C) 具有出色的稳定性。我们的结果表明成功构建了由内部 ZNPs 层和外部 SNCs 层组成的独特双层界面结构。由于 SNCs 可以在 50 °C 下胶凝，之后可以在液滴周围形成致密的壳。这种热响应界面结构可用于在较高温度下保护疏水性生物活性物质，同时在某些条件下仍允许受控释放。此外，由于具有较高的内相分数，HIPPE 可能会替代市场上的蛋黄酱和沙拉酱，因为它们具有相似的外观和特性。在去除内部油之后，可以进一步制造多孔材料，其在环境保护或组织工程方面具有潜在的应用。
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