探索FTIR Amide I带解卷的使用,以在高湿度挤出过程中调查蛋白质二次结构和纹理
Clara Barnés-Calle1, Pere Gou1, Elena Fulladosa1
1IRTA. Food Quality and Technology. Finca Camps i Armet, s/n, 17121 Monells, Girona, Spain.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
|January 25, 2026
概括
富里埃变换红外光谱法 (FTIR) 用胺I频段解卷法评估了在高湿度挤出加工 (HMEP) 过程中,豆蛋白缩中的蛋白质变化. 结果表明HMEP改变了蛋白质结构,但纹理水平与形状变化没有直接相关.
科学领域:
- 食品科学与技术 食品科学与技术
- 生物物理化学 生物物理化学
- 蛋白质化学 蛋白质化学
背景情况:
- 福里埃变换红外光谱法 (FTIR) 和胺I频段解卷法用于研究高湿度挤出加工 (HMEP) 过程中的蛋白质结构变化.
- 这种技术的敏感性和用户依赖性导致了关于其分析方法的辩论.
- 在HMEP过程中调查豆蛋白缩物 (FBPC) 中的蛋白质结构变化对于了解食品加工影响至关重要.
研究的目的:
- 评估FTIR Amide I带解卷的适用性,用于分析经过热处理的FBPC和HMEP中的蛋白质结构变化.
- 探索蛋白质构成和高湿度挤出材料 (HME) 的纹理水平之间的关系.
- 调查样本准备和参数选择对FTIR解卷结果的影响.
主要方法:
- 法瓦豆蛋白缩物 (FBPC) 经过对流炉加热或HMEP在110°C,135°C和165°C.
- 富里埃自分解 (FSD) 和第二导数 (SD) 方法用于分析FTIR光谱中的蛋白质二次结构.
- 研究了样本准备和参数选择在FSD和SD程序中的影响.
主要成果:
- FTIR Amide I 波段解卷显示出对样本准备和参数选择的显著敏感性.
- 在FBPC中,HMEP诱导了初始β片结构的变性,并增加了其他结构,如分子间β片或聚合物.
- 较高的HMEP温度增强了纤维状结构的形成,但纹理化水平与最终的HME中的蛋白质二次结构没有直接相关.
结论:
- FTIR Amide I带解卷是一种敏感的方法,用于评估HMEP期间的蛋白质结构变化,但需要仔细优化样本准备和分析参数.
- 在FBPC中,HMEP显著改变了蛋白质构成,促进了变性和可能形成新的分子间键.
- 在研究条件下,HME产品的纹理水平不仅仅是由蛋白质二次结构变化决定的.
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