The present study focused on investigating the storage stability of oil-in-water (O/W) emulsions with high oil volume fractions prepared with palm olein-based diacylglycerol oil (POL-DAG)/soybean oil (SBO) blends at 25 °C. The incorporation of different ratios of oil blends significantly influenced (p < 0.05) the texture, color, droplet size distribution, and rheological parameters of the emulsions. Only emulsions incorporated with 10% to 20% POL-DAG in oil phase exhibited pseudoplastic behavior that fitted the Power Law model well. Furthermore, the O/W emulsions prepared with POL-DAG/SBO blends exhibited elastic properties, with G’ higher than G”. During storage, the emulsion was found to be less solid-like with the increase in tan δ values. All emulsions produced with POL-DAG/SBO blends also showed thixotropic behavior. Optical microscopy revealed that the POL-DAG incorporation above 40% caused aggregated droplets to coalesce and flocculate and, thus, larger droplet sizes were observed. The current results demonstrated that the 20% POL-DAG substituted emulsion was more stable than the control emulsion. The valuable insights gained from this study would be able to generate a lot more possible applications using POL-DAG, which could further sustain the competitiveness of the palm oil industry.

中文翻译：

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浓缩棕榈油基二酰基甘油油-大豆油共混物水包油乳液的制备：流变性质和储存稳定性的深入研究。

本研究的重点是研究棕榈油基二酰基甘油油（POL-DAG）/大豆油（SBO）混合物在25°C下制备的具有高油体积分数的水包油（O / W）乳液的储存稳定性。掺入不同比例的油混合物会显着影响（p <0.05）乳液的质地，颜色，液滴尺寸分布和流变参数。只有在油相中掺入10％至20％POL-DAG的乳液才会显示出与Power Law模型非常吻合的假塑性行为。此外，用POL-DAG / SBO共混物制备的O / W乳液具有弹性，G'高于G”。在储存过程中，发现随着tanδ值的增加，乳液的固态性降低。用POL-DAG / SBO共混物生产的所有乳液也都具有触变性。光学显微镜显示，POL-DAG的掺入超过40％导致聚集的液滴聚结并絮凝，因此观察到较大的液滴尺寸。目前的结果表明，用20％POL-DAG取代的乳液比对照乳液更稳定。从这项研究中获得的宝贵见识将能够使用POL-DAG产生更多可能的应用，这可以进一步维持棕榈油行业的竞争力。