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Characterisation of Films Based on Exopolysaccharides from Alteromonas Strains Isolated from French Polynesia Marine Environments

Authors :
Patrícia Concórdio-Reis
João R. Pereira
Vítor D. Alves
Ana R. Nabais
Luísa A. Neves
Ana C. Marques
Elvira Fortunato
Xavier Moppert
Jean Guézennec
Maria A.M. Reis
Filomena Freitas
UCIBIO - Applied Molecular Biosciences Unit
DQ - Departamento de Química
LAQV@REQUIMTE
CENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N)
DCM - Departamento de Ciência dos Materiais
Source :
Polymers; Volume 14; Issue 20; Pages: 4442
Publication Year :
2022

Abstract

This work assessed the film-forming capacity of exopolysaccharides (EPS) produced by six Alteromonas strains recently isolated from different marine environments in French Polynesia atolls. The films were transparent and resulted in small colour alterations when applied over a coloured surface (ΔEab below 12.6 in the five different colours tested). Moreover, scanning electron microscopy showed that the EPS films were dense and compact, with a smooth surface. High water vapour permeabilities were observed (2.7–6.1 × 10−11 mol m−1 s−1 Pa−1), which are characteristic of hydrophilic polysaccharide films. The films were also characterised in terms of barrier properties to oxygen and carbon dioxide. Interestingly, different behaviours in terms of their mechanical properties under tensile tests were observed: three of the EPS films were ductile with high elongation at break (ε) (35.6–47.0%), low tensile strength at break (Ꞇ) (4.55–11.7 MPa) and low Young’s modulus (εm) (10–93 MPa), whereas the other three were stiffer and more resistant with a higher Ꞇ (16.6–23.6 MPa), lower ε (2.80–5.58%), and higher εm (597–1100 MPa). These properties demonstrate the potential of Alteromonas sp. EPS films to be applied in different areas such as biomedicine, pharmaceuticals, or food packaging.

Details

Language :
English
Database :
OpenAIRE
Journal :
Polymers; Volume 14; Issue 20; Pages: 4442
Accession number :
edsair.doi.dedup.....51311f73a1e0a22ab3cd8208be016ba5