Journal
FOOD CHEMISTRY
Volume 367, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2021.130603
Keywords
Lentil protein isolate; Polyphenols; Protein-polyphenol conjugates; SPR; Antioxidant activity
Funding
- Saskatchewan Agricultural Development Fund [20150274]
- CFI-John R. Evans Leaders Fund [2012-31292]
- Innovation and Science Fund (ISF) from the Saskatchewan Ministry of Advanced Education
- University of Saskatchewan
- NSERC
- CFI
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Conjugating lentil protein isolate with plant polyphenols improves antioxidant properties, providing a novel approach for developing novel food ingredients.
Lentil protein isolate (LPI) was conjugated with plant polyphenols (quercetin, rutin, ellagic acid), and the structural and functional characteristics of the conjugates were determined in comparison with the proteins and pure polyphenols. The interaction between polyphenols and protein was achieved by a grafting method at pH 9.0 in the presence of atmospheric oxygen. Surface plasmon resonance measurements showed polyphenols' direct interaction with LPI, with the order of binding strength quercetin > ellagic acid > rutin. The degree of conjugation also followed the same order. Structural analysis of the conjugates was performed using FTIR, intrinsic fluorescence, and surface hydrophobicity. A significant improvement in DPPH radical scavenging and ferric reducing antioxidant power of the conjugates was observed compared to the polyphenols. However, there was a decrease in the surface activity of the conjugates compared to LPI. Such conjugation provides a novel way to combine the advantages of using plant protein and polyphenols in developing a novel food ingredient.
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