Journal
LWT-FOOD SCIENCE AND TECHNOLOGY
Volume 97, Issue -, Pages 151-156Publisher
ELSEVIER
DOI: 10.1016/j.lwt.2018.06.055
Keywords
Albumen; Foam; Secondary structure; Phosphorylated
Categories
Funding
- National Natural Science Foundation of China [31701622]
- Hubei Provincial Natural Science Foundation of China [2018CFB606]
- Fundamental Research Funds for the Central Universities [2662018JC022]
- Modern Agro-Industry Technology Research System [CARS-41-K23]
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Egg white protein was phosphorylated with microwave assistance (200 W, 300 W, 400 W, 500 W and 600 W) in the presence of sodium tripolyphosphate at pH 8.0, and the structural and foaming properties of the protein were investigated in this work. The degree of phosphorylation increased at first and then remained unchanged. Fourier Transform infrared spectroscopy showed that egg white had new characteristic absorption bands by phosphorylation. Circular dichroism spectroscopy and surface hydrophobicity analysis revealed that the phosphorylated proteins had a more unfolded and flexible structure. The phosphorylated proteins had higher absolute values of zeta potential and a lower content of free-SH. After treatment with microwave at the 500 W level, phosphorylated protein had a 0.44 times (P < 0.05) greater foaming ability and 1.1 times (P < 0.05) greater foaming stability compared with the untreated sample. The results suggested that microwave-assisted phosphorylation modification is a practical method to improve egg white protein foaming properties.
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