Vicia villosa protein isolate: a new source of protein to make a biodegradable film

Farnaz Rezaiyan Attar,Fatemeh Rezagholi,Mohammad Ali Hesarinejad

doi:10.5219/913

Abstract

Edible films from Vicia villosa protein isolate (VVPI) containing different contents of glycerol and sorbitol (30, 40, 50 and 60%w/w of protein) were developed. The aim of this study was to investigate the influence of type and concentration of plasticizers on the properties of edible films obtained from VVPI. Type and concentration of plasticizer significantly (p <0.05) affected the mechanical, barrier, thermal and surface properties as well as opacity of the films. As plasticizer concentration increased, tensile strength decreased concomitant with increase in elongation at break and water vapor permeability. The similar trend behavior was observed for the film solubility, which increased with increasing plasticizer concentration. Sorbitol plasticized films, showed higher film solubility compared to glycerol plasticized films. Sorbitol plasticized films provided the most tensile strength values; however, its effect on water vapor permeability was low. In contrast, glycerol plasticized films exhibited the least tensile strength values, resulting in increasing water vapor permeability. Opacity of glycerol plasticized films was lower than that of sorbitol plasticized films, and decreased with increasing plasticizer content (p <0.05). Also, a significant decrease (p <0.05) was observed in thermal features and surface hydrophobicity values with increasing in plasticizer contents. It was observed that the films plasticized with sorbitol had lower moisture content than those with glycerol.

Highlights

The Current global consumption of plastics is more than 300 million tonnes, with an annual grow of approximately 5% (Bioplastics market data, 2015)
Tensile strength decreased concomitant with increase in elongation at break and water vapor permeability
The present study revealed that the edible films of coherent Vicia villosa protein isolate (VVPI) were prepared when these plasticizers were incorporated at the concentrations between 20% and 70% (w/w of protein)

Summary

Introduction

The Current global consumption of plastics is more than 300 million tonnes, with an annual grow of approximately 5% (Bioplastics market data, 2015). Plastic materials are not inert and where direct contact between the packed commodity and the plastic container occurs, there can be transfer of sufficiently mobile or soluble substances into the product as a result of a concentration gradient. These substances may be polymer additives and/or other adventitious impurities, such as monomers, catalyst remnants, polymer breakdown products and residual polymerization solvents. With the increasing demand of consumers for high quality foods and concerns on limited natural resources and the environment, the use of renewable resources to produce edible or biodegradable packaging materials that can maintain product quality and reduce waste disposal problems are being explored (Rhim and Ng, 2007)

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