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In modern society, there is a constant need for developing reliable, sustainable, and cost-effective antibacterial materials. Here, we investigate the preparation of cellulose nanocrystal (CNC)-lysozyme composite films via he well-established method of evaporation-induced self-assembly. We consider the effects of lysozyme concentration and aggregation state (native lysozyme, lysozyme amyloid fibers, and sonicated lysozyme amyloid fibers) on suspension aggregation and film-forming ability. Although at higher lysozyme loading levels (ca. 10 wt %), composite films lost their characteristic chiral nematic structuring, these films demonstrated improved mechanical properties and antibacterial activity with respect to CNC-only films, regardless of lysozyme aggregation state. We anticipate that the results presented herein could also contribute to the preparation of other CNC-protein-based materials, including films, hydrogels, and aerogels, with improved mechanical performance and antibacterial activity.

Assembly of Cellulose Nanocrystal–Lysozyme Composite Films with Varied Lysozyme Morphology