2026-09-06T15:43:39Zhttps://riubu.ubu.es/oai/requestoai:riubu.ubu.es:10259/92682024-06-15T00:05:21Zcom_10259_4313com_10259_5086com_10259_2604com_10259_3596com_10259_4244col_10259_4314col_10259_3597col_10259_4245
Repositorio Institucional de la Universidad de Burgos
author
Diop, Cherif Ibrahima Khalil
author
Beltrán Calvo, Sagrario
author
Sanz Díez, Mª Teresa
author
García Tojal, Javier
author
Trigo López, Miriam
2024-06-14T10:28:30Z
2024-06-14T10:28:30Z
2023-11
0268-005X
http://hdl.handle.net/10259/9268
10.1016/j.foodhyd.2023.108987
Packaging is a crucial tool for reducing food waste and enhancing product competitiveness. Fossil fuel-based plastics, mostly used for food packaging, account for nearly 40% of global plastic waste. To address this issue, this study developed a layer-by-layer casting technique to create novel bilayered plastic composites with distinct agar/chitosan and PVA/agar layers. Film's properties, such as thickness, plasticity, and tensile strength, were affected by adjusting the volume of the layers. The elongation at break was positively related to the presence of citric acid (up to 30 wt%) as a crosslinker. The chitosan-rich first layer provided better UV-light blocking potential and opacity, which were beneficial in the prevention of lipid oxidation. Increasing the second layer by 40–60% substantially reduced the light absorption, while the colors were proportional to the citric acid content. The FT-IR band at 1713 cm−1 indicated an increase in C=O ester groups with crosslinker content. The hydrophobicity of the films was enhanced by the chitosan-rich layer. XRD supported intramolecular and intermolecular hydrogen bonding, whereas the micrographs revealed tightly bound structure between layers. The results corroborated that the inclusion of agar in the formulations increased the stability of the film, making it ideal for various packaging applications.
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Double-layered films
Composite packaging
Agar/chitosan
Crosslinked PVA/Agar
Layer-by-layer casting
Designing bilayered composite films by direct agar/chitosan and citric acid-crosslinked PVA/agar layer-by-layer casting for packaging applications
info:eu-repo/semantics/article
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URL
https://riubu.ubu.es/bitstream/10259/9268/1/Cherif-fh_2023.pdf
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77de61821545473fb9e19991ad65db18
9231205
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Cherif-fh_2023.pdf