May
2004
Volume
81
Number
3
Pages
423
—
428
Authors
Sandra
Domenek
,
1
Lothar
Brendel
,
2
Marie-Hélène
Morel
,
1
and
Stéphane
Guilbert
1
,
3
Affiliations
Laboratory of Cereal Technology and Agropolymers, ENSA.M-INRA, 2 place Viala, 34060 Montpellier Cedex 1, France.
Present address: Theoretische Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany.
Corresponding author. Phone: +33 (0)4 99 61 28 31. Fax: +33 (0)4 67 52 20 94. E-mail: guilbert@ensam.inra.fr
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RelatedArticle
Accepted November 17, 2003.
Abstract
ABSTRACT
The influence of the network structure of wheat gluten on the barrier properties against enzymes was investigated in vitro. The changes in the network structure were introduced by different temperature treatments. The modifications were assessed with solubility studies of wheat gluten proteins in sodium dodecyl sulfate (SDS). The physical barrier properties of wheat gluten membranes were investigated with transport studies examining the transfer of a model protein with no enzymatic activity (BSA) through gluten membranes. The protein network was an effective barrier for BSA, although lightly cross-linked films were mechanically instable. Membrane breaks occurred in function of the cross-linking density (percentage of SDS-insoluble proteins) after only 24 hr for lightly cross-linked films (≈30% SDS-insoluble proteins), while highly cross-linked membranes (≈80% SDS-insoluble protein) were tight up to more than 33 days. The digestion experiments of the gluten films with pepsin showed that the hydrolysis of wheat gluten films with >72% of SDS-insoluble protein was significantly retarded. In conclusion, technological treatments to increase the cross-linking density of gluten have the potential to slow the digestion of cereal-based foodstuff and to reduce the degradation rate of composite biomaterials.
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© 2004 American Association of Cereal Chemists, Inc.