Journal
FOOD CHEMISTRY
Volume 339, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2020.128145
Keywords
Procyanidin; Lactoferrin; Forms; Interactions; Docking analysis; Structure-function
Funding
- National Natural Science Foundation of China [31760441]
- Research Program of State Key Laboratory of Food Science and Technology, Nanchang University [SKLF-ZZB-201922]
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After mixing procyanidin with lactoferrin, solution turbidity and intrinsic fluorescence quenching increased, while surface hydrophobicity of lactoferrin was reduced. This binding interaction led to significant changes in the structure of both polyphenol and protein, with thermodynamic analysis indicating spontaneous interaction mainly driven by entropy changes.
The solution turbidity and intrinsic fluorescence quenching increased after procyanidin was mixed with lactoferrin. The addition of procyanidin also caused a reduction in the surface hydrophobicity of the lactoferrin, suggesting procyanidin bound to non-polar patches on lactoferrin's surfaces. Moreover, the binding interaction caused an appreciable alteration in the structure of both the polyphenol and protein. Thermodynamic analysis indicated the interaction was spontaneous and mainly driven by entropy changes, suggesting that hydrophobic interactions dominated. A computational docking simulation provided insights into the location of the mostlikely binding sites on the protein, as well as the nature of the interaction forces involved. In particular, both hydrophobic and hydrogen bonding were found to be important. The binding of the procyanidin to the lactoferrin enhanced its foaming properties. These results may lead to the development of a new class of natural functional ingredients that can be used in food products to improve their quality attributes.
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