The effect of cross-linking additives on the structure and properties of glassy wheat gluten material

被引:13
作者
Bruyninckx, Kevin [1 ]
Jansens, Koen J. A. [2 ,3 ]
Delcour, Jan A. [2 ,3 ]
Smet, Mario [1 ]
机构
[1] Katholieke Univ Leuven, Polymer Chem & Mat Div, Dept Chem, Celestijnenlaan 200F, B-3001 Leuven, Belgium
[2] Katholieke Univ Leuven, Lab Food Chem & Biochem, Kasteelpk Arenberg 20, B-3001 Leuven, Belgium
[3] Leuven Food Sci & Nutr Res Ctr LFoRCe, Leuven, Belgium
关键词
Cross-linking additives; Mechanical properties; Rigid materials; Wheat gluten; COMPRESSION-MOLDED GLASSY; MECHANICAL-PROPERTIES; MOISTURE-CONTENT; GLUTARALDEHYDE; NETWORK; FORMALDEHYDE; TEMPERATURE; FILMS;
D O I
10.1016/j.indcrop.2015.11.049
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
High-temperature compression molding of wheat gluten, an industrial co-product of the manufacture of wheat starch, yields a rigid, glassy gluten material. The improvement of the mechanical properties of this type of material by thiolated additives has been attributed to their simultaneously occurring reducing and/or cross-linking impacts. In this study, three additives with different cross-linking functionalities but which lack reducing properties are tested for their ability to cross-link the gluten network and improve its mechanical properties: glutaraldehyde (DAL), neopentyl glycol diacrylate (DAC) and a retro Diels-Alder based thermally activated cross-linker. The effect of cross-linking on fully reduced disulfide free gluten (MG) was also studied. Both DAL and DAC were able to cross-link (modified) gluten protein during mixing as well as during the molding step while TAC was active during molding. All additives were more effective at cross-linking the MG network than untreated gluten likely due to its higher level of available thiol groups and its less constrained network. However, there was no straightforward link between increased cross-link density and improved mechanical properties. Overall, we postulate that increasing the level of cross-linking in gluten protein can only benefit the mechanical properties when favorable secondary interactions and physical entanglements in the network are retained. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:38 / 48
页数:11
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