BACKGROUND Ultrasonic spray nozzle was evaluated for the production of powders and microcapsules, using blueberry extract, modified starch (HI-CAP 100) and whey protein isolate (WPI). Also, the effect of ultrasonic power and concentration of coating materials on the characteristics of the resulting samples (such as viscosity, particle size, microencapsulation efficiency, color, glass transition temperature, FTIR, XRD and morphology) were studied. RESULTS The apparent viscosity was primarily affected by the self-heating of the ultrasonic nozzle as the power increased. The largest mean particle size of samples was observed under the conditions of 30% coating concentration at 10 W. Glass transition temperatures (Tg ) of the samples were affected by all atomization parameters significantly (p < 0.05) and the highest Tg values of all samples were determined when the coating concentration was maximum (30%) and power level was minimum (5 W). According to FT-IR and XRD results, the power of ultrasonic nozzle did not cause any change in WPI structure and led to only a small change in the structure of HI-CAP 100 at 10 W. The short atomization time preserved to some extent the properties of the coating materials as well as the blueberry extract. In the morphological properties, it was observed that the samples obtained with WPI showed less shrinkage than HI-CAP 100. CONCLUSION The results indicated that ultrasonic nozzle could be successfully used to prepare the blueberry microcapsule using HI-CAP 100 and WPI as coating materials. The study may contribute to the development of ultrasonic nozzle applications using different coatings for the microencapsulation of high-quality functional materials. This article is protected by copyright. All rights reserved.

中文翻译：

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超声波喷嘴对蓝莓提取物微囊化糖基和蛋白质基包衣材料的影响

背景 使用蓝莓提取物、改性淀粉 (HI-CAP 100) 和乳清分离蛋白 (WPI) 对超声波喷嘴的粉末和微胶囊生产进行了评估。此外，还研究了超声功率和涂层材料浓度对所得样品特性（如粘度、粒径、微囊化效率、颜色、玻璃化转变温度、FTIR、XRD 和形貌）的影响。结果表观粘度主要受超声波喷嘴随着功率增加而自热的影响。在 30% 涂层浓度和 10 W 的条件下观察到样品的最大平均粒径。样品的玻璃化转变温度 (Tg) 受所有雾化参数的影响显着 (p < 0。05) 和所有样品的最高 Tg 值是在涂层浓度最大 (30%) 和功率水平最小 (5 W) 时确定的。根据 FT-IR 和 XRD 结果，超声波喷嘴的功率不会引起 WPI 结构的任何变化，仅导致 HI-CAP 100 在 10 W 时的结构发生很小的变化。较短的雾化时间在一定程度上保留了包衣材料和蓝莓提取物的特性。在形态学特性上，观察到用WPI 制备的样品比HI-CAP 100 的收缩更小。结论结果表明超声波喷嘴可以成功地制备以HI-CAP 100 和WPI 为涂层材料的蓝莓微胶囊。该研究可能有助于开发使用不同涂层对高质量功能材料进行微胶囊化的超声波喷嘴应用。本文受版权保护。版权所有。