Biofilms based on cassava starch containing Yerba Mate as antioxidant and plasticizer

C.MEDINA JARAMILLO; P. GONZÁLEZ SELIGRA; S. GOYANES; C. BERNAL; L. FAMA

STARCH/STARKE

WILEY-V C H VERLAG GMBH

Lugar: Weinheim; Año: 2015 vol. 67 p. 780 - 789

0038-9056

Cassava starch based films containing different concentrations of yerba mate extract asantioxidant (0, 5, and 20%) were prepared by casting. The effect of the incorporation of the extracton the antioxidant activity, structure, and physicochemical properties of the biofilms wasevaluated. Significant antioxidant capacity in the films with yerba mate extract was obtained,especially in the materials containing 5% of the additive. The surface roughness and contactangle of the systems containing the extract increased, indicating hydrofobic behavior of the filmssurface when the additive was used. This was also confirmed by water vapor permeability andwater content results. The incorporation of yerba mate extract led to an important improvementin the elasticity of the biofilms, as well as to a shift of the relaxations associated with the glycerol-rich and starch-rich phases to lower temperature values, revealing a typical behavior of aplasticized film. The relevant antioxidant and plasticizing effects of yerba mate extract on cassavastarch films make them promising to be used as coatings or packaging in the food industry.