Abstract

LIMON-VALENZUELA, V et al. Elaboration of edible starch films using CaCO₃ nanoparticles and plasticizers by optimized extrusion-casting process. Biotecnia [online]. 2022, vol.24, n.3, pp.52-62.  Epub June 19, 2023. ISSN 1665-1456.  https://doi.org/10.18633/biotecnia.v24i3.1508.

Edible films (EF) can be produced and developed for preservation of fruits and vegetables. Starch has been considered one of the biopolymers with the greatest potential to produce edible films through different processing techniques, such as extrusion-casting. Our objective was to study the effect of calcium carbonate nanoparticles (NPsCC) and plasticizers (sorbitol-glycerol (80-20%; w/w)) produced by extrusion (EXT)-casting (CT) combination technologies, to obtain EF with improved mechanical and barrier properties. Corn starch-plasticizers were processed in a twin-screw extruder to produce modified thermoplastic starch, followed by the addition of calcium carbonate nanoparticles (CCNP) in casting to EF formation. A hybrid design (four factors; twenty-one treatments) of surface response methodology was used to optimization process. The optimal EF mechanical and barrier properties were characterized according to microstructural properties (X-ray diffraction, Scanning Electron Microscopy) to determine the damage caused in the starch during EXT and CT. In conclusion, it is possible to obtain EF with greater both Breaking Strength and Deformation, as well as, lower Water Vapor Permeability and Solubility (mechanical and barrier properties), through the use of CCNP and plasticizers, using EXT-CT combination processes.

Keywords : Starch edible films; CaCO nanoparticles; extrusion; microstructural properties.

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