Article (Scientific journals)
Effects of extraction procedures and plasticizer concentration on the optical, thermal, structural and antioxidant properties of novel ulvan films
Guidara, M.; Yaich, H.; Richel, Aurore et al.
2019In International Journal of Biological Macromolecules, 135, p. 647–658
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Keywords :
Ulvan, Active films; Extraction conditions; Plasticizers, Physical properties; Antioxidant properties
Abstract :
[en] Active films were produced with sulphated polysaccharides “ulvan”, extracted from the green seaweed Ulvalactuca with different extraction procedures, by varying the glycerol or sorbitol plasticizer concentration at 1% and 2% (w/v). The surface charge and glass transition temperature (Tg) of ulvanswere carried out by zeta (ζ)-potential and DSC analysis, respectively. The investigation revealed that ulvans were anionic stable polymers and they had great Tg values. Regardless of the extraction procedure, ulvans can give successful films formulations. However, the optical, thermal, structural and antioxidant characteristics of ulvan films were strongly affected by extraction conditions and by the variation of the type and concentration of plasticizer. In general, as plasticizer concentration increased, ferrous chelating activity and compact structure increased as well, while, Tg, lightness and DPPH radical-scavenging activity decreased. Interestingly, the films plasticizedwith glycerol exhibited better compact structure,more negative temperature of transition, and greater free radical scavenging ability thanwith sorbitol. However, the films prepared with sorbitol had the highest L* values and chelating ability. The current study revealed a high correlation between zeta (ζ)-potential of ulvans and their Tg (R2 = 0.98), as well as with scavenging activity of ulvan films (R2=0.8–0.99).
Disciplines :
Biotechnology
Author, co-author :
Guidara, M.
Yaich, H.
Richel, Aurore  ;  Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > SMARTECH
Blecker, Christophe ;  Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > SMARTECH
Boufi, S.
Attia, H.
Garna, H.
Language :
English
Title :
Effects of extraction procedures and plasticizer concentration on the optical, thermal, structural and antioxidant properties of novel ulvan films
Publication date :
2019
Journal title :
International Journal of Biological Macromolecules
ISSN :
0141-8130
eISSN :
1879-0003
Publisher :
Elsevier, Netherlands
Volume :
135
Pages :
647–658
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 June 2020

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