Functional properties of extruded and tubular films of sorghum starch-based glycerol and Yucca Schidigera extract

The objective of this research was to evaluate the effects of processing parameters on functional properties of extruded and tubular films. Four formulations of sorghum starch, with glycerol, and Yucca Schidigera extract, were used to prepare extruded and tubular films. Based on mechanical testing the formulation of 78.5% sorghum starch, 20% glycerol and 1.5% Yucca Schidigera extract, with 20% moisture content, showed the best mechanical properties and was selected to evaluate the effect of barrel temperature and screw speed during the fabrication of tubular films. Films were characterized through mechanical testing, scanning electron microscopy, water vapor permeability, water disintegration index, density and thickness.

► Thermoplastic extrusion was used to produce extruded and tubular films starch-based glycerol and Yucca Schidigera extract.
► The selected extruded film was selected to evaluate the effect of barrel temperature and screw speed during the fabrication of tubular film.
► Films were characterized through mechanical testing, SEM, WVP, water disintegration index, density and thickness.