Improvement of mechanical and water absorption properties of plant protein based bioplastics
Journal article, 2017

Bioplastics deriving from plant proteins are becoming an increasingly popular source of raw material for plastic products since they are not only biodegradable but renewable resources. However, these bioplastics require improved mechanical and water absorption properties to be suitable for many applications, such as packaging. For this reason, this study considers potato and rice proteins as a new source for the manufacture of bioplastics. The proteins were mixed with different glycerol concentrations followed by thermomoulding at temperatures from 60 to 180 degrees C. The resulting bioplastic is characterized in terms of thermo-mechanical properties, water absorption and molecular weight distribution. Compared to well-known wheat gluten, these bioplastics required higher temperatures for their thermomoulding. However, both of them were more structured materials and exhibited less water absorption (e.g. as low as 9 wt.%) than those obtained for wheat gluten blend. Potato protein-based bioplastics showed complex modulus values comparable to synthetic polymers such as Low Density Polyethylene (LDPE).

Rice protein



Potato protein

Molecular weight properties

Water absorption


D. Gomez-Heincke

University of Huelva

I. Martinez

University of Huelva

Mats Stading

Chalmers, Materials and Manufacturing Technology, Polymeric Materials and Composites

C. Gallegos

University of Huelva

P. Partal

University of Huelva

Food Hydrocolloids

0268-005X (ISSN)

Vol. 73 21-29

Subject Categories

Polymer Chemistry

Polymer Technologies

Areas of Advance

Life Science Engineering (2010-2018)



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