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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Effects of High-Pressure Processing at Low Temperature on the Molecular Structure and Surface Properties of beta-Lactoglobulin.
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Effects of High-Pressure Processing at Low Temperature on the Molecular Structure and Surface Properties of beta-Lactoglobulin.

机译:低温高压处理对β-乳球蛋白分子结构和表面性质的影响。

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High-pressure processing (HPP) was utilized to induce unfolding of beta-lactoglobulin (beta-LG). beta-Lactoglobulin solutions at concentrations of 0.5 mg/mL, in pH 7.5 phosphate buffer, were pressure treated at 510 MPa for 10 min at either 8 or 24 degrees C. The secondary structure, as determined by circular dichroism (CD), of beta-LG processed at 8 degrees C appeared to be unchanged, whereas beta-LG processed at 24 degrees C lost alpha-helix structure. Tertiary structures for beta-LG, as determined by near-UV CD, intrinsic protein fluorescence spectroscopy, hydrophobic fluorescent probe binding, and thiol group reactivity, were changed following processing at either temperature. The largest changes to tertiary structure were observed for the samples processed at 24 degrees C. Model solutions containing the pressure-treated beta-LG showed significant decreases in surface tension at liquid-air interfaces with values of 54.00 and 51.69 mN/m for the samples treated at 24 and 8 degrees C, respectively. In comparison, the surface tension for model solutions containing the untreated control was 60.60 mN/m. Changes in protein structure during frozen and freeze-dried storage were also monitored, and some renaturation was observed for both storage conditions. Significantly, the sample pressure-treated at 8 degrees C continued to display the lowest surface tension.
机译:高压处理(HPP)用于诱导β-乳球蛋白(β-LG)的展开。在pH 7.5磷酸盐缓冲液中浓度为0.5 mg / mL的β-乳球蛋白溶液在510 MPa下于8或24摄氏度加压处理10分钟。通过圆二色性(CD)测定,β的二级结构在8摄氏度下加工的-LG似乎没有变化,而在24摄氏度下加工的β-LG失去了α-螺旋结构。通过在任一温度下加工后,通过近紫外CD,内在蛋白质荧光光谱,疏水性荧光探针结合和硫醇基反应性确定的β-LG的三级结构均发生了变化。在24摄氏度下处理的样品中,三级结构的变化最大。含有压力处理过的β-LG的模型溶液在液-气界面处的表面张力显着降低,样品的值分别为54.00和51.69 mN / m。分别在24和8摄氏度下处理。相比之下,含有未处理对照的模型溶液的表面张力为60.60 mN / m。还监测了冷冻和冻干储存过程中蛋白质结构的变化,并且在两种储存条件下均观察到一些复性。显着地,在8℃下压力处理的样品继续表现出最低的表面张力。

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