Effects of high hydrostatic pressure on the functional properties of soy protein isolate

大豆蛋白 化学 溶解度 静水压力 傅里叶变换红外光谱 粘度 食品科学 分析化学(期刊) 色谱法 化学工程 材料科学 有机化学 热力学 物理 工程类 复合材料
作者
Kubra Zengin,Barış Özel,Mecit Halil Öztop,Hami Alpas
出处
期刊:Journal of Food Process Engineering [Wiley]
卷期号:47 (3) 被引量:1
标识
DOI:10.1111/jfpe.14578
摘要

Abstract In this study, functional properties of high hydrostatic pressure (HHP)‐treated soy protein isolate (SPI) samples including protein solubility, emulsification activity (EA), and water holding capacity (WHC) were studied. Fourier transform infrared spectroscopy (FTIR), viscosity, and nuclear magnetic resonance (NMR) relaxometry experiments were performed. Three pressure (300, 400, and 500 MPa), two pH (5.0 and 7.0), and two temperature levels (25 and 40°C) were used to prepare SPI samples. Solubility of SPI was more pH‐dependent than HHP‐dependent, whereas WHC was more sensitive to pressure. Samples processed at 300 MPa, pH 5.0, and 40°C demonstrated higher EA ( p < .05) than the untreated samples. Pressure application significantly reduced the viscosity of SPI dispersions ( p < .05). Samples processed at 300 MPa, pH 5.0, and 40°C and at 400 MPa, pH 5.0, and 40°C attained the longest transverse relaxation time ( T 2 ) values reflecting their low solubility profiles. Thus, results indicated that HHP was able to modify the functional properties of SPI at different temperature and pH conditions. Practical Applications High hydrostatic pressure (HHP) is an emerging technology with its diverse range of applications in food industry. Modification of functional properties of food ingredients is one of the latest applications of HHP treatment. This study demonstrated that HHP treatment was able to modify some functional properties of soy protein isolate (SPI) samples including water holding capacity, solubility, and emulsification activity. Pressure level, pH, and temperature affected the functional properties of SPI samples. The parameter type/range and results of this study could be used in model HHP studies to improve some functional properties of SPI for different purposes.
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