豆蛋白分离纤维和益阳氨酸之间的动态非共价键变化的机制:pH调节的途径
Yongchao Yin1, Xiaoyu Yang1, Liang Li1
1College of Food Science, Northeast Agricultural University, Harbin 150030, China.
Food chemistry
|June 22, 2025
概括
研究了大豆蛋白分离纤维素 (SPIF) 和益阳氨酸 (OPC) 的相互作用. 在pH值为4时观察到最佳的功能性质,显示出改善的乳化和发泡活性.
科学领域:
- 食品科学 食品科学 食品科学
- 生物化学 生物化学
- 材料科学 材料科学 材料科学
背景情况:
- 豆蛋白分离纤维素 (SPIF) 在食品系统中很重要.
- 了解蛋白质-多相互作用对于食品的功能至关重要.
- 众所周知,proanthocyanidins (OPC) 与蛋白质发生相互作用.
研究的目的:
- 为了研究SPIF和OPC之间的pH值依赖的非对应性结合机制.
- 阐明这些相互作用如何影响SPIF结构和功能性质.
- 确定增强SPIF乳化和发泡活动的最佳条件.
主要方法:
- 光火用于研究SPIF-OPC结合.
- 在pH范围 (2-7),分析非共价相互作用 (静电,疏水,键,范德瓦尔斯键).
- 评估SPIF结构变化 (β-sheet破坏) 和形态.
- 评估SPIF的乳化和发泡特性.
主要成果:
- OPC诱导的SPIF光的静态火.
- 在pH 4时,结合主要由静电和疏水相互作用.
- 在pH 4以上,结合涉及键,范德瓦尔斯键和疏水相互作用.
- 增加pH值 (2-7) 导致SPIF结构展开,并破坏了β片结构.
- 在SPIF的同电点 (pH5) 附近,其溶解性和乳化特性被最小化.
- OPC显著增强了SPIF的乳化和发泡活动,特别是在pH 4时.
结论:
- pH显著影响SPIF和OPC之间的非共价相互作用.
- 添加OPC可以改善SPIF的功能性质,特别是乳化和发泡.
- 在OPC的存在下,在pH 4时,SPIF功能得到最佳增强.
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