Enhancement of emulsification properties by modulation of egg white protein fibril structure with different heating times

被引:52
作者
Dong, Wanyi [1 ]
Zhang, Xinyue [1 ]
Ding, Lixian [1 ]
Liu, Cong [1 ]
Ai, Minhui [1 ]
Jin, Yongguo [1 ]
Isobe, Kazuhiro [2 ]
Handa, Akihiro [3 ]
Cai, Zhaoxia [1 ,4 ]
机构
[1] Huazhong Agr Univ, Coll Food Sci & Technol, Natl Res & Dev Ctr Egg Proc, Key Lab Environm Correlat Dietol, Wuhan 430070, Peoples R China
[2] Kewpie Corp, R&D Div, Tokyo, Japan
[3] Tokyo Denki Univ, Sch Sci & Engn, Div Life Sci, Saitama, Japan
[4] Technol Huazhong Agr Univ, Coll Food Sci, Wuhan, Hubei, Peoples R China
关键词
Egg white protein; Protein fibril; Structural characterization; Emulsifying properties; Environmental stability; PHYSICOCHEMICAL PROPERTIES; IONIC-STRENGTH; EMULSIFYING PROPERTIES; PH; SALT; AGGREGATION;
D O I
10.1016/j.foodhyd.2022.108203
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Egg white protein (EWP) has poor emulsification ability due to the hydrophobic groups buried in the molecular structure. In contrast, the protein fibrils produced by acidic heat treatment are able to expose the hydrophobic groups and firmly adsorb to the surface of oil droplets. Therefore, the preparation of egg white protein fibrils (EWPF) can broaden the range of applications of EWP, such as low-fat emulsion-based foods. Since the heating time affects the growth condition of the fibrils and thereby the properties of their stabilized emulsions. The effect of treatment time on the structure properties and emulsification properties of EWP during fibrillation, also the effect of different environments on the stability of EWPF emulsion were investigated. The EWPF content increased with heating time. During the heating of EWP under acidic condition, proteins were hydrolyzed into peptides, subsequently peptides aggregated unidirectionally to form fibrils due to electrostatic repulsive forces at low pH. Compared with EWP, EWPF had larger particle size, higher zeta-potential, higher beta-sheet content and greater surface hydrophobicity. In addition, the emulsifying activity and emulsification stability of the EWPF emulsion increased nearly two-fold compared with that of the EWP emulsion. Furthermore, it had smaller droplets, higher zeta-potential, and better thermal and ionic stability. This study could provide insights into the improvement of EWP emulsifying properties and fibril-modified EWP as stabilizing ingredients for emulsion -based foods.
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页数:11
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