How the biodegradability of wheat gluten-based agromaterial can be modulated by adding nanoclays |
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Authors: | Anne Chevillard Hélène Angellier-Coussy |
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Institution: | a UMR IATE, Université Montpellier II, CC023, pl. E Bataillon, 34095 Montpellier Cedex, France b UMR IATE, Montpellier SupAgro, Bat 37, 2 place Viala, 34060 Montpellier, France c SERPBIO, Laboratoire LIMATB-L2PIC, Université de Bretagne Sud, rue Saint Maudé, 56321 Lorient Cedex, France |
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Abstract: | The objective of this work was to investigate the influence of clay nanoparticles on the biodegradability of wheat gluten-based materials through a better understanding of multi-scale relationships between biodegradability, water transfer properties and structure of wheat gluten/clay materials. Wheat gluten/clay (nano)composites materials were prepared via bi-vis extrusion by using an unmodified sodium montmorillonite (MMT) and an organically modified MMT. Respirometric experiments showed that the rate of biodegradation of wheat gluten-based materials could be slowed down by adding unmodified MMT (HPS) without affecting the final biodegradation level whereas the presence of an organically modified MMT (C30B) did not significantly influence the biodegradation pattern. Based on the evaluation of the water sensitivity and a multi-scale characterization of material structure, three hypotheses have been proposed to account for the underlying mechanisms. The molecular/macromolecular affinity between the clay layers and the wheat gluten matrix, i.e. the ability of both components to establish interactions appeared as the key parameter governing the nanostructure, the water sensitivity and, as a result, the overall biodegradation process. |
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Keywords: | Biodegradation Wheat gluten Montmorillonite Nanocomposite Water sensitivity |
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