Biochemical properties of bioplastics made from wheat gliadins cross-linked with cinnamaldehyde |
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Authors: | Balaguer M Pau Gómez-Estaca Joaquín Gavara Rafael Hernandez-Munoz Pilar |
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Affiliation: | Instituto de Agroquímica y Tecnología de Alimentos-CSIC, Grupo de Envases, Avenida Agustín Escardino 7, 46980 Paterna, Valencia, Spain. |
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Abstract: | The aim of this work has been to study the modification of gliadin films with cinnamaldehyde as a potential cross-linker agent. The molecular weight profile and cross-linking density showed that cinnamaldehyde increased reticulation in the resulting films. The participation of free amino groups of the protein in the newly created entanglements could be a possible mechanism of connection between the polypeptidic chains. The combination of a Schiff base and a Michael addition is a feasible approach to understanding this mechanism. The protein solubility in different media pointed to lower participation by both noncovalent and disulfide bonds in stabilizing the structure of the cross-linked films. The new covalent bonds formed by the cinnamaldehyde treatment hampered water absorption and weight loss, leading to more water-resistant matrices which had not disintegrated after 5 months. The properties of this novel bioplastic could be modified to suit the intended application by using cinnamaldehyde, a naturally occurring compound. |
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