The Mechanism of Whey Protein on Membrane Surface Fouling During Ultrafiltration Process

Ultrafiltration (UF) is widely used in the fraction and concentration of whey proteins. During this process, protein polarization on the membrane surface increases the resistance of the membrane system and decreases the permeate flux. In this study, the protein structure changes as the protein surro...

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Bibliographic Details
Published in:Food biophysics 2024-03, Vol.19 (1), p.143-159
Main Authors: Wang, Wen-qiong, Zhou, Ji-yang, Li, Jian-ju, Cong-Cong, Tang
Format: Article
Language:English
Subjects:
Analytical Chemistry
Biological and Medical Physics
Biophysics
Calcium ions
Chemistry
Chemistry and Materials Science
Food Science
Fouling
Ions
Magnesium
Membrane processes
Membrane proteins
Membranes
Protein structure
Proteins
Sodium
Tryptophan
Tyrosine
Ultrafiltration
Whey
Whey protein
Zeta potential
Zinc
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Summary:Ultrafiltration (UF) is widely used in the fraction and concentration of whey proteins. During this process, protein polarization on the membrane surface increases the resistance of the membrane system and decreases the permeate flux. In this study, the protein structure changes as the protein surrounding the ionic environment changes, including Ca 2+ , K + , Na + , Mg 2+ and Zn 2+ , during the ultrafiltration process were investigated. It was found that when the ratio of Na + was higher than the other ions around the protein, the particle size of whey protein was increased and the zeta potential value decreased compared at 2–8 min. At this time, the protein surface hydrophilic group of tyrosine and tryptophan was exposed. The AFM results showed that an increase in the Na + ion ratio could lead to membrane fouling. Furthermore, the increased proportion of Zn 2+ could induce protein deposition on the membrane surface. The β-sheet content increased and the α-helix content decreased continuously after 21 min. Graphical abstract The dynamic change of whey protein structure with various ions’ environment concentration changes for membrane fouling formation during filtration process
ISSN:1557-1858
1557-1866
DOI:10.1007/s11483-023-09811-9