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Effect of oxidation induced by hydroxyl radical‐mediated model on molecular structural and physical character of egg white powder

Author:
Wang, Jianming, Zhao, Yarou, Niu, Sisi, Wang, Xiaojing, Chen, Fengqing
Source:
International journal of food science & technology 2018 v.53 no.10 pp. 2282-2289
ISSN:
0950-5423
Subject:
ambient temperature, denaturation, egg albumen, ferric chloride, functional properties, hydrogen peroxide, hydrophobicity, models, moieties, oxidation, particle size, particle size distribution, sulfhydryl groups
Abstract:
The objective of this study was to determine structure and functional properties changes of oxidised egg white protein derived from hydrogen peroxide (H₂O₂)/ferric chloride (FeCl₃) /ascorbic acid hydroxyl radical‐generating systems at room temperature, including carbonyls, sulfhydryl and total sulfhydryl groups, dityrosine, free amino, surface hydrophobicity, particle size distribution, intermolecular forces, and foamability and emulsibility. Protein carbonyl and dityrosine content of egg white protein were increased (P < 0.05) with increasing the concentrations of H₂O₂. Oxidation decreased free sulfhydryl, total sulfhydryl groups and surface of hydrophobicity comparing with nonoxidised egg white protein. Oxidation also reduced its free amino content (P < 0.05). The low concentration of H₂O₂ contributing the average particle size of egg white protein was smaller than the control group. However, the high concentrations of H₂O₂ caused that egg white protein aggregated and the average particle size became larger. To sum up, oxidation made EWP denaturation and aggregation.
Agid:
6127576