Effects of Emulsification of Fat on the Surface Tension of Protein Solutions and Surface Properties of the Resultant Spray-Dried Particles

表面张力 乳清蛋白 水解 乳状液 微量分析 化学 分离乳清蛋白粉 喷雾干燥 吸附 脂肪球 粒径 粒子(生态学) 色谱法 化学工程 作文(语言) 食品科学 材料科学 乳脂 有机化学 语言学 物理 海洋学 哲学 物理化学 量子力学 工程类 地质学 亚麻籽油
作者
Yun Yun Xu,T. Howes,Benu Adhikari,Bhesh Bhandari
出处
期刊:Drying Technology [Taylor & Francis]
卷期号:31 (16): 1939-1950 被引量:21
标识
DOI:10.1080/07373937.2013.802331
摘要

Abstract To examine the effect of protein adsorption on the fat–water interface on the surface composition of spray-dried particles, whey, hydrolyzed whey, and soy protein isolate emulsions were prepared at three different protein to fat ratios of 1:1, 1:5, and 1:10 and spray dried. Non-hydrolyzed whey protein isolate (WPI) and the more hydrolyzed whey protein solutions at 20.2% degree of hydrolysis (DH) had significantly lower surface tension values with fat than without fat. The correlation between the reduction of surface tension value of an emulsion and the increase in protein surface composition of powder particles was observed for WPI and HWP406 but was not observed for the other protein isolate types. It was clear that the spray-dried emulsions had fat as the dominant component on the surface of the powder particles and that the amount of protein on the surface became severely depressed at higher fat addition levels. In terms of its powder morphology, the unique powder structures such as the indentations and folds usually found on the surface of protein containing powders were not evident because they were compromised by the presence of high surface fat. The powder with higher surface fat had more crumpled particle structures and dimpled surfaces. Keywords: EmulsionFatFood proteinsHydrolysisPowderSEMSoy proteinSurface activitySurface tensionWhey proteinWilhelmyXPS ACKNOWLEDGMENT The authors acknowledge the facilities, and the scientific and technical assistance, of the Australian Microscopy & Microanalysis Research Facility at the Centre for Microscopy and Microanalysis, The University of Queensland. Notes Surface tension values followed by different superscript letters within each column are significantly different (P < 0.05) from each other. Surface tension values followed by different superscript letters within each column are significantly different (P < 0.05) from each other. Mean droplet size values followed by different superscript letters within each column are significantly different (P < 0.05) from each other. P = protein, F = fat.

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