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Evaluation of Composition on Processability and Water Absorption of Wheat Gluten-Based Bioplastics

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Abstract

The nature of the plasticizer fraction within a bioplastic matrix is of extreme importance. Thus, brittleness has sometimes been observed when water has been used. The goal of the present manuscript has been to assess the effects of the addition of sucrose and trehalose in gluten-based bioplastics either in presence or absence of water. It was found that the role of the disaccharides in the samples studied depended on whether water was present or not in the formulation. Therefore, when water was included in the formulation together with glycerol, sugars were solubilized within the aqueous fraction, and then played a plasticizer role in the bioplastics. In that case, lower torque and temperatures during mixing, as well as lower viscoelastic properties and greater water absorption ability were generally observed in the presence of sugars. On the other hand, when no water was added, sugars acted as fillers, especially sucrose, which reinforced the blends as denoted by lower loss tangents and higher viscoelastic moduli. In this case, a microporous structure is formed after water immersion, observing smaller pore sizes in the positions previously taken by those sugars. The present manuscript highlights the importance of the procedure followed when introducing sugars in the formulation on the eventual properties of the bioplastics.

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Acknowledgements

This research work is part of the RTI2018-097 100-B-C21 project funded by the Spanish Ministerio de Ciencia e Innovación—Agencia Estatal de Investigación (MICINN) and FEDER programme. The authors thankfully acknowledge their financial support. Finally, the authors acknowledge CITIUS (Universidad de Sevilla, Spain) for providing all the access and assistance to the Zeiss Evo microscope by the Microscopy and Microanalysis Service.

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Authors and Affiliations

  1. Departamento de Ingeniería Química, Facultad de Química, Universidad de Sevilla, 41011, Seville, Spain

    María Alonso-González, María Ramos & Alberto Romero

  2. Departamento de Ingeniería Química, Universidad de Sevilla, Escuela Politécnica Superior, Calle Virgen de África 7, 41011, Seville, Spain

    Carlos Bengoechea & Antonio Guerrero

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  1. María Alonso-González
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Correspondence to María Alonso-González.

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Alonso-González, M., Ramos, M., Bengoechea, C. et al. Evaluation of Composition on Processability and Water Absorption of Wheat Gluten-Based Bioplastics. J Polym Environ 29, 1434–1443 (2021). https://doi.org/10.1007/s10924-020-01969-4

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