Rheological and thermal characteristics of wheat gluten biopolymers plasticized with glycerol

Abstract

The objective this work was to obtain bioplastics from mixtures of wheat gluten and glycerol by two different processes and evaluate their respective rheological properties. The mixtures and their respective bioplastics were obtained through direct batch mixing under approximately adiabatic and isothermal conditions. The bioplastics showed high values for the storage (G') and loss (G") moduli, suggesting a stronger protein network formed in both processes. The temperature onset and the percentage of weight loss to be estimated were found to be near in both bioplastics. The bioplastics have demonstrated to be materials of interesting potential of use as biodegradable barrier materials

Effects of gliadin addition on the rheological, microscopic and thermal characteristics of wheat gluten

“…The unusual properties of the wheat are ascribed to the presence of gluten forming storage proteins of the endosperm which are further composed of two fractions -the alcohol soluble gliadins and the alcohol insoluble glutenins [2][3][4][5]. Gliadins contain intermolecular disulfide bonds, the breaking of which causes the unfolding of the protein molecule.…”

Thermomechanical and Morphological Properties of Nanocomposite Films from Wheat Gluten Matrix and Cellulose Nanofibrils

“…During thermal degradation under nitrogen, two samples of CNF‐reinforced and without CNF had a four steps‐decomposition pattern with approximately the same degradation onset temperature, about 20% ash remaining at 800 °C and a maximum weight loss at 293.6 °C and 292.53, respectively. This pattern is in accordance to that reported by Ferreira and others () for WG biopolymers plasticized with glycerol. The first step, which occured below 200 °C, corresponded to the elimination of both free and bound water and lignin decomposition starting well below 200 °C and persisting above 700 °C, and, in this case, the weight loss was approximately 4%.…”

Bio-Plastics - An Alternative to Petroleum Based Plastics

“…Other treatments are shown lesser effect on elongation and this elongation rate is reduced with decreasing glycerol ratio because glycerol can act as a plasticizer [13,14]. Anyhow gelatin has highest elongation percentage than corn starch.…”