Novel Egg White Protein–Chitin Nanocrystal Biocomposite Films with Enhanced Functional Properties
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Date
2025-09-25
Authors
Baquero Aznar, VíctorCalvo, Víctor
González Domínguez, José Miguel
Maser, Wolfgang K.
Benito, Ana M.
Salvador, María Luisa
González Buesa, Jaime
Journal Title
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Publisher
MDPi
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texto , revista , artículo , artículo originalAbstract
This study aims to develop egg white protein (EWP) biocomposite films reinforced with chitin nanocrystals (ChNCs, 1–5 wt.%) by compression molding to overcome the mechanical and barrier limitations of protein-based films for sustainable packaging. ChNC incorporation may modulate film microstructure, crystallinity, and thermal stability, thereby enhancing functional performance. Films were prepared by adding ChNCs either as aqueous suspensions or lyophilized powder, and their structural, thermal, mechanical, optical, and barrier properties were systematically evaluated. Scanning electron microscopy confirmed a more homogeneous dispersion of ChNCs when added as suspensions, while powder addition promoted partial aggregation. X-ray diffraction revealed increased crystallinity with ChNC reinforcement. Mechanical tests showed that films with 2 wt.% ChNCs in suspension exhibited the highest tensile strength, whereas those with 5 wt.% in powder form became stiffer but less extensible. Oxygen permeability was not significantly affected, while water vapor permeability decreased by up to 14.5% at 2 wt.% ChNCs incorporated as powder. Transparency and color remained largely unchanged by ChNC addition, except for a slight increase in yellowness. Overall, these findings demonstrate that the incorporation method and concentration of ChNCs play a crucial role in tailoring the physicochemical performance of EWP films. The results provide new insights into the design of EWP-based nanocomposites and support their potential as bio-derived materials for advanced food packaging applications.
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Bibliographic citation
Baquero-Aznar, V., Calvo, V., González-Domínguez, J. M., Maser, W. K., Benito, A. M., Salvador, M. L., González-Buesa, J., Baquero-Aznar, V., Calvo, V., González-Domínguez, J. M., Maser, W. K., Benito, A. M., Salvador, M. L., & González-Buesa, J. (2025). Novel Egg White Protein–Chitin Nanocrystal Biocomposite Films with Enhanced Functional Properties. Polymers, 17(18). https://doi.org/10.3390/polym17182538
AGROVOC subjects
QuitinaClara de huevo
Proteínas de origen animal
Película
Polímeros biodegradables
Envasado
Permeabilidad
Sponsorship
Este trabajo ha sido financiado por el Ministerio de Ciencia e Innovación de España (proyectos PID2022–142850OR-I00 y PID2019–108080RR-100, y beca predoctoral PRE2020–094379 a V. Baquero-Aznar), y por el Departamento de Industria e Innovación (Gobierno de Aragón) a través del proyecto PROY-T41-24 y la beca para grupos de investigación T07–23R y T03-23R.