Influence of processing temperature on the water vapour transport properties of wheat gluten based agromaterials |
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Authors: | Hélène Angellier-Coussy Emmanuelle Gastaldi Nathalie Gontard Valérie Guillard |
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Institution: | Unité Mixte de Recherche « Ingénierie des Agropolymères et Technologies Emergentes », INRA/ENSA.M/UMII/CIRAD, Université Montpellier II, CC023, pl. E Bataillon, 34095 Montpellier Cedex, France |
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Abstract: | The influence of processing conditions (thermoforming temperature) on water vapour transport properties (permeability, sorption and diffusion) of wheat gluten-based films was studied in relation to structural properties (cross-linking degree of the wheat gluten matrix). Increasing temperature from 80 °C to 120 °C led to a significant decrease in material swelling in high moisture environment and a WVP reduction mainly due to a decrease in diffusivity but without important effect on the moisture sorption isotherms. This was attributed to a higher cross-linking degree of protein network for film thermoformed at 120 °C, with a limited mobility and less possibilities of rearrangement in high moisture conditions. |
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Keywords: | Wheat gluten Water vapour Sorption Diffusion |
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