Development of chitosan/montmorillonite nanocomposites with encapsulated alpha-tocopherol

作者：Dias Marali Vilela^*; Azevedo Viviane Machado; Borges Soraia Vilela; Ferreira Soares Nilda de Fatima; de Barros Fernandes Regiane Victoria; Marques Joao Jose; Alves Medeiros Eber Antonio

来源：Food Chemistry, 2014, 165: 323-329.

DOI：10.1016/j.foodchem.2014.05.120

• Moisture resistance
• Structural properties
• Morphological properties
• Packaging

Nanocomposites of chitosan (CS) were developed and characterized in a full factorial design with varying levels of montmorillonite (MMTNa) and encapsulated tocopherol (toc-encap). The structural properties (XRD, FTIR), morphology (TEM), hygroscopic properties (water vapour permeability, hydrophobicity, sorption isotherms) and optical properties (haze, CIELab parameters) of the resulting materials were evaluated. Toc-encap contents up to 10% influenced the intercalation of MMTNa in the CS matrix, resulting in films with reduced water vapour permeability (3.48 x 10(-11) (g/m s Pa)), increased hydrophobicity (Delta G(Hydroph) vertical bar 7.93-59.54 vertical bar mJ m(-2)) and lower equilibrium moisture content (EMC), thus showing potential for active food packaging materials. At levels above 10%, toc-encap agglomerates occurred, which deteriorated the properties of the resulting films, as shown with the TEM. As the toc-encap content increased, the films became slightly more yellow, more irregular and less transparent, with a higher haze index.

• 出版日期2014-12-15