Biodegradable Zein-Based Blend Films: Structural, Mechanical and Barrier Properties

The effect of adding a hydrocolloid on the structural, mechanical and barrier properties of zein-based blend films is evaluated. Zein-oleic acid blend film with added xanthan gum (Z-OA-XG) showed higher water solubility (13.09%) and opacity (8.49 AU/mm) than zein-oleic acid (Z-OA) film (10.80% and 5...

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Bibliographic Details
Published in:Food technology and biotechnology 2015, Vol.53 (3), p.348-348
Main Authors: Serna, Carolina Pena, Filho, José Francisco Lopes
Format: Article
Language:English
Subjects:
biodegradable material
Biodegradable materials
Biodegradation
blend film
Food packaging
Food science
microstructure
permeability
Plant proteins
Plastics
Properties
Scientific Note
Structure
tensile properties
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Summary:The effect of adding a hydrocolloid on the structural, mechanical and barrier properties of zein-based blend films is evaluated. Zein-oleic acid blend film with added xanthan gum (Z-OA-XG) showed higher water solubility (13.09%) and opacity (8.49 AU/mm) than zein-oleic acid (Z-OA) film (10.80% and 5.19 AU/mm, respectively). Furthermore, Z-OA film had greater flexibility with lower Young's Modulus (YM=5.02 MPa) and higher elongation at break ( =10.62%); nonetheless, it was less resistant to tension (tensile strength =8.5 MPa) than Z-OA-XG film, which showed YM, and of 6.38 MPa, 6.66% and 10.485 MPa, respectively. Both films had glossy and homogeneous structure with comparable water vapour and oxygen barrier properties around 4.39·10 and 1.82·10 g/(Pa·s·m), respectively. Based on that, xanthan gum structure influenced mainly mechanical and light barrier properties of zein-oleic acid blend films.
ISSN:1330-9862
1334-2606
DOI:10.17113/ftb.53.03.15.3725