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LGP2 - Contribution to the study of gluten as material: contribution of different types of lignins

Published on January 23, 2014
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PhD Defense November 15, 2013

Antoine Duval defended his PhD thesis from the University of Grenoble entitled "Contribution to the study of gluten as material: contribution of different types of lignins".

This PhD thesis was prepared at the LGP2 Laboratory under the supervision of Christine Chirat, Associate Professor at Grenoble INP-Pagora, and at the Cermav under the supervision of Sonia Boisseau, Associate Professor.

Wheat gluten, a set of proteins from the wheat kernel, is commonly used to process polymeric materials, usually in the presence of glycerol as a plasticizer. Its use is however limited, because of its high sensitivity to water and relatively poor mechanical properties when compared to synthetic polymers. The influence of the glycerol content on the water absorbance, the phase separation and their glass transition were first studied.

Then, another biopolymer, wood lignin, has been incorporated into the materials in order to enhance their properties. The influence of different types of lignin from the paper pulp industry, Kraft lignin and lignosulfonates, have been investigated. Kraft lignin addition enhances materials rigidity and thermal properties, and reduces the water sensitivity, whereas lignosulfonates allow to decrease the glycerol content, resulting in better mechanical properties and reduced water sensitivity.

To gain insights into the interactions between gluten and lignins, several fractionation procedures have then been carried out. The influence of the protein type and lignin molecular mass could be pointed out, and were correlated to the materials macroscopic properties.

Press release
PhD thesis of LGP2 (2013)
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Date of update February 4, 2014

Grenoble INP Institut d'ingénierie Univ. Grenoble Alpes