Air-water interfacial properties of enzymatically hydrolyzed wheat gluten in the presence of sucrose

[en] Enzymatically hydrolyzed wheat gluten proteins may be a valuable alternative to animal proteins as foaming agents in food. Studies of the air-water (A-W) interfacial properties of such hydrolysates in aqueous solutions contribute to the understanding of their functionality in food systems. We here studied the A-W interfacial characteristics of wheat gluten hydrolysates (GHs) in the absence and presence of sucrose. Sucrose increased (P < 0.05) the foaming capacity, which is the initial amount of foam formed, of GHs. This is probably related to an increased affinity of GHs for the A-W interface in the presence of sucrose, as could be observed by higher (P < 0.05) rates of diffusion to and adsorption at the A-W interface of the GH constituents in sucrose solution compared to those in water. Furthermore, the surface dilatational moduli of GH protein films at A-Winterfaces were in most cases higher (P < 0.05) in a sucrose solution than in water. The latter could only partly be related to differences in foam stability. Surface hydrophobicity and intrinsic tryptophan fluorescence measurements revealed that protein conformational changes in the presence of sucrose might be at the basis of the observed differences. Another possibility is that the hydrophilic sucrose molecules in the bulk cause the more hydrophobic protein molecules to concentrate at the interface, more so than in water. In conclusion, it is crucial to investigate the foaming of plant protein hydrolysates in media more complex than water, as other nonsurface-active food ingredients alter their interfacial behavior.

Disciplines :

Food science

Author, co-author :

Wouters, Arno G.B.

Fierens, Ellen

Rombouts, Ine

Brijs, Kristof

Blecker, Christophe ; Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Microbial, food and biobased technologies

Delcour, Jan A.

Language :

English

Title :

Air-water interfacial properties of enzymatically hydrolyzed wheat gluten in the presence of sucrose

Publication date :

14 July 2017

Journal title :

Food Hydrocolloids

ISSN :

0268-005X

eISSN :

1873-7137

Publisher :

Elsevier Science

Issue :

Pages :

284-294

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 17 October 2017

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