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Material properties of films from enzymatically tailored arabinoxylans

Anders Höije (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Erik Sternemalm (Institutionen för kemi- och bioteknik) ; Susanna Heikkinen ; Maija Tenkanen ; Paul Gatenholm (Institutionen för kemi- och bioteknik, Polymerteknologi)
Biomacromolecules (1525-7797). 9, p. 2042–2047. (2008)
[Artikel, refereegranskad vetenskaplig]

Rye arabinoxylan with an initial arabinose to xylose (Ara/Xyl) ratio of 0.50 was enzymatically modified with α-L-arabinofuranosidase. Different enzyme dosages were used to prepare arabinoxylan samples with a gradient of arabinose content varying from Ara/Xyl ratio 0.50 to 0.20. The degree of polymerization of the arabinoxylans was not affected by the enzymatic treatment, as detected with SEC-MALLS. Arabinoxylan samples with an Ara/Xyl ratio of 0.30 and below agglomerated in a water solution as seen by changes in light scattering. All samples, however, formed cohesive films upon drying, without addition of external plasticisers. The film from untreated arabinoxylan was completely amorphous; whereas films of the enzyme treated arabinoxylans were semi-crystalline with an increasing degree of crystallinity with decreasing arabinose content as determined by WAXS. Oxygen permeability measurements of the films showed that decreased arabinose content also resulted in lower oxygen permeability of the films. All films were strong and relatively stiff, but showed variations in strain at break. The moderately debranched film with an Ara/Xyl ratio of 0.37 had highest strain at break among all the films tested, yet was stiff and strong. This material also exhibited yielding, and had stress/strain behavior similar to synthetic semi-crystalline polymers, with a tendency to strain induced crystallization. Such combination of mechanical properties combined with oxygen barrier properties is very attractive for packaging applications.

Nyckelord: Arabinoxylan, enzyme treatment, α-arabinosidase, arabinose substitution, rye, mechanical and barrier properties



Denna post skapades 2008-11-21.
CPL Pubid: 78513

 

Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)
Institutionen för kemi- och bioteknik (2005-2014)

Ämnesområden

Annan kemiteknik

Chalmers infrastruktur

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Bioprocessing, Structure and Material Properties of Arabinoxylans