Preparation and characterization of sodium caseinate films reinforced with cellulose derivatives

► We used carboxymethyl cellulose and cellulose acetate to reinforce a protein matrix. ► We prepare films with low cellulose derivative (CD) amounts by suspension casting. ► Addition of CD reduced the equilibrium moisture content and elongation at break. ► Film opacity, tensile modulus and strength increased with CD concentration. ► Performance depended on CD water-solubility, rigidity and dispersion quality.