Functional Properties of Myofibrillar Protein‐based Biopackaging as Affected by Film Thickness

Fish myofibrillar protein‐based biopackagings were developed from a film‐forming solution cast on plates. Film thickness was modulated by variations in “apparent thickness” of the cast solution to evaluate effects on the main functional properties. The thickness variations seemed to have no influence on optical properties (apparent opacity) or on percent solubility in water. Study of mechanical properties revealed that elongation at break and relaxation coefficient were not dependent on film thickness, while force at break was directly proportional to film thickness. This could be interpreted by variations in the number of potential intermolecular interactions in the films. Analysis of water vapor transport showed that the biopackaging did not behave as an ideal material according to Fick's and Henry's laws.