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Comparative Study
. 2020 Aug 27;18(9):447.
doi: 10.3390/md18090447.

Chitosan Films Incorporated with Exopolysaccharides from Deep Seawater Alteromonas Sp

Iratxe Zarandona  1 , Mónica Estupiñán  2 , Carla Pérez  2 , Laura Alonso-Sáez  2 , Pedro Guerrero  1 , Koro de la Caba  1
Affiliations
Comparative Study

Chitosan Films Incorporated with Exopolysaccharides from Deep Seawater Alteromonas Sp

Iratxe Zarandona et al. Mar Drugs. .

Abstract

Two Alteromonas sp. strains isolated from deep seawater were grown to promote the production of exopolysaccharides (EPS, E611 and E805), which were incorporated into chitosan solutions to develop films. The combination of the major marine polysaccharides (chitosan and the isolated bacterial EPS) resulted in the formation of homogenous, transparent, colorless films, suggesting good compatibility between the two components of the film-forming formulation. With regards to optical properties, the films showed low values of gloss, in the range of 5-10 GU, indicating the formation of non-glossy and rough surfaces. In addition to the film surface, both showed hydrophobic character, with water contact angles higher than 100 º, regardless of EPS addition. Among the two EPS under analysis, chitosan films with E805 showed better mechanical performance, leading to resistant, flexible, easy to handle films.

Keywords: Alteromonas; chitosan; exopolysaccharides; films.; marine bacteria.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
UV–vis light absorption of control (CH) and chitosan films with E805 (CHE805) and E601 (CHE601).
Figure 2
Figure 2
FTIR (Fourier Transform Infrared) spectra of (a) E611 and E805 and (b) those of control (CH) and chitosan films with E611 (CHE611) and E805 (CHE805).
Figure 3
Figure 3
XRD (X-ray diffraction) patterns of control (CH) and chitosan films with E611 (CHE611) and E805 (CHE805).
Figure 4
Figure 4
SEM (Scanning Electron Microscopy) images of cross-sections of (a) control films and chitosan films enriched with (b) E611 and (c) E805 exopolysaccharides.
See this image and copyright information in PMC

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