Mechanistic insights into gel formation of egg-based yoghurt: The dynamic changes in physicochemical properties, microstructure, and intermolecular interactions during fermentation
文献类型: 外文期刊
第一作者: Zang, Jianwei
作者: Zang, Jianwei;Pan, Xiaoyang;Zhang, Yuanyuan;Tu, Yonggang;Xu, Haixia;Zhang, Qingfeng;Chen, Jiguang;Yin, Zhongping;Tang, Daobang
作者机构:
关键词: Egg-based yoghurt; Texture; Rheology; Microstructure; Intermolecular force
期刊名称:FOOD RESEARCH INTERNATIONAL ( 影响因子:8.1; 五年影响因子:7.7 )
ISSN: 0963-9969
年卷期: 2023 年 172 卷
页码:
收录情况: SCI
摘要: This study aimed to elucidate the mechanism of acid-induced gelation in egg-based yoghurt by investigating the dynamic changes in physicochemical properties, texture, rheology, and microstructure of the gel during fermentation, combined with the role of intermolecular forces in gel formation. Results showed that protein aggregation and cross-linking increased as pH decreased during fermentation. Gel hardness increased with fermentation, eventually reaching 11.36 g, while maintaining low fracturability. Water holding capacity (WHC) decreased from 91.77% to 73.13% during fermentation. Rheological testing demonstrated a significant increase in viscosity and dynamic moduli (G' and G"), consistent with the observation of a more compact microstructure by scanning electron microscopy (SEM) and particle size analysis. Furthermore, dynamic changes of surface hydrophobicity, sulfhydryl content, and intermolecular forces suggested that hydrophobic interactions were likely the main driving force for gel formation, as well as that hydrophobic interactions and disulfide bonds played an important role in the maintenance and construction of the gel network structure. Although ionic bonds and hydrogen bonds also had an effect on the gel formation of egg-based yoghurt, their contributions were not significant. The study provided new insights for the development of novel egg-based fermentation foods and the research of acid-induced protein gels, and also contributed to the deep exploitation and utilization of poultry eggs.
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