葡萄糖调节乳清蛋白分离物的聚合和脱聚合机制.
Yuzhi Tian1, Zhishen Mu2, Sinan Mu1
1Key Laboratory of Dairy Science (Northeast Agricultural University), Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, 150030, China.
Journal of agricultural and food chemistry
|July 28, 2025
概括
谷氨 (GSH) 影响乳清蛋白分离物 (WPI) 的聚合和脱聚合. 较高的GSH度使WPI脱聚化,而特定度则诱导聚合和交叉链接,影响食品应用.
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
- 生物化学 生化学
背景情况:
- 乳清蛋白分离物 (WPI) 是一种有价值的食品成分.
- 了解蛋白质聚合对于食品加工和功能至关重要.
- 谷氨 (GSH) 是一种已知的生物活性醇化合物.
研究的目的:
- 调查不同谷氨 (GSH) 度对乳清蛋白分离物 (WPI) 聚合和脱聚合的影响.
- 阐明不同温度下的GSH-WPI相互作用背后的分子机制.
- 为了确定在GSH诱导的WPI修改过程中形成的特定交叉链接点.
主要方法:
- 在一系列的GSH度 (0-60mM) 和温度 (50,65,80°C) 中研究了WPI聚合/脱聚合.
- 测量了WPI-GSH复合体的分子量,粒子大小,绝对潜力和内源光.
- 使用液体染色学-质谱/质谱 (LC/MS/MS) 来识别交联.
主要成果:
- 在50°C和80°C时,GSH诱导了WPI聚合物的脱聚合,使分子量和颗粒大小下降.
- 在65°C时,GSH最初增加了WPI聚合,然后才导致脱聚合.
- LC/MS/MS确定了新的分子间,分子内和循环交联,确定了阿尔法-乳蛋白和β-乳蛋白的特定位点.
结论:
- 的度和温度显著影响WPI聚合和通过硫化-硫化交换反应的脱聚合.
- 特定的GSH度 (2-10毫米) 促进聚合,而较高的度 (20-60毫米) 导致脱聚合.
- 这项研究为GSH在调节乳清蛋白结构中的作用提供了分子洞察力,这与食品工业应用相关.
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