Influence of Cellulose Nanoparticles on the Hydrophobic and Optical Barrier Properties of Chitosan‐Based Biofilms

ABSTRACT The potential of developing nanocomposite‐based biofilms by incorporating cellulose nanocrystals (CNC) into chitosan (Chi) matrices has yet to be fully explored. This study specifically examined how the incorporation of CNC influences the surface hydrophobicity and ultraviolet–visible (UV–vis) light barrier properties of Chi‐based biofilms, with the aim of enhancing their suitability for active food packaging applications. Film‐forming solutions were prepared using 0.8% chitosan blended with CNC at varying concentrations (0%, 0.1%, 0.5%, and 1%). The morphology of CNC was analyzed using atomic force microscopy (AFM). Results showed that CNC addition enhanced both UV and visible light barrier properties, as well as the hydrophobicity of the films. Scanning electron microscopy (SEM) was used to examine the surface and internal microstructure of the films. Overall, the study indicates that the developed CNC–Chi nanocomposite films possess promising potential for application as environmentally friendly active packaging materials.