pH诱导的接口蛋白质结构的变化,以调整通过高压均化制备的白蛋白分离物乳液的稳定性
Qingguan Liu1, Ailin Chen1, Pengzhi Hong1
1College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China.
Food chemistry: X
|October 8, 2024
概括
提拉皮亚蛋白分离物 (TPI) 乳液稳定性在pH值为3.0和10.0时得到增强,这是由于结构变化造成的. 增加的α-螺旋含量与改善的乳液稳定性正相关.
科学领域:
- 食品科学 食品科学 食品科学
- 蛋白质化学 蛋白质化学
- 生物物理化学 生物物理化学
背景情况:
- 蛋白质结构显著影响功能性质,如乳化.
- pH 是影响蛋白质构成和稳定的关键因素.
- 提拉皮亚蛋白分离物 (TPI) 是一种有价值的食品成分,具有增强应用的潜力.
研究的目的:
- 研究二次结构变化与TPI的乳液稳定性之间的关系.
- 为了确定不同pH值和高压均质化对TPI结构和乳化的影响.
- 确定与增强的TPI乳液稳定性相关的结构参数.
主要方法:
- 使用高压均质化制备TPI乳液.
- 使用光谱技术分析TPI二次结构 (例如,循环二元化).
- 通过颗粒大小分析,泽塔潜力和化指数测量,在pH值范围为3.0-10.0.的范围内评估乳液稳定性.
主要成果:
- 随着pH离异电点 (pH 5.0) 的移动,TPI的溶解度和乳化特性增加.
- 在pH值3.0和10.0下观察到最佳的乳液稳定性,其特点是颗粒尺寸较小,zeta潜力更高,度最小.
- 二次结构分析揭示了pH和高压诱导的转变,特别是在异电点附近的α-螺旋到β-片的转换.
结论:
- TPI的乳液稳定性与其二次结构有很强的相关性,特别是与α-螺旋体含量有正相关性,与β-片含量有负相关性.
- 调整pH值远离同电点并采用高压均质化可以调节TPI二次结构以提高乳液稳定性.
- 这项研究提供了通过结构操纵优化食品系统中TPI功能的见解.
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