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Flexible oxygen barrier films from spruce xylan

Alfredo Escalante (Institutionen för kemi- och bioteknik) ; Ana Goncalves (Institutionen för kemi- och bioteknik) ; Aase Bodin (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Agnes Stepan (Institutionen för kemi- och bioteknik, Polymerteknologi) ; C. Sandstrom ; Guillermo Toriz (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Paul Gatenholm (Institutionen för kemi- och bioteknik, Polymerteknologi)
Carbohydrate Polymers (0144-8617). Vol. 87 (2012), 4, p. 2381-2387.
[Artikel, refereegranskad vetenskaplig]

Arabinoglucuronoxylan was extracted from Norway spruce and films prepared by casting from aqueous solution. The sugar analysis and NMR confirmed that the spruce xylan was composed of arabinose, 4-O-methyl-glucuronic acid and xylose in a ratio of 1:2:11 respectively. Substitutions of 4-O-methyl-alpha-D-GlcpA at O-2 and of alpha-L-Araf at O-3 on the xylose backbone were found by NOE analysis. NOE cross-peaks indicated as well that there is at least one free xylose on the main chain present between two substitutions. Whether the distribution of side chains was random or in blocks was uncertain. The average molecular weight of the sample was determined by size exclusion chromatography to be 12,780 g/mol. Arabinoglucoronoxylan casting yielded transparent flexible films with an average stress at break of 55 MPa, strain at break of 2.7% and a Young's Modulus 2735 MPa. Wide-angle X-ray scattering analysis showed that the arabinoglucuronoxylan films were totally amorphous. Addition of sorbitol as plasticizer resulted in less strong but more flexible films (strain at break of 5%). Peaks of crystallinity could be seen in X-ray which corresponds to sorbitol crystallizing in distinct phases. The dynamic mechanical analysis showed that the arabinoglucuronoxylan film softened at a later relative humidity (80% RH) in comparison with plasticized films (60% RH). The films showed low oxygen permeability and thus have a potential application in food packaging.

Nyckelord: Arabinoglucuronoxylan, Characterization, Film formation, Material, properties, dietary fiber, arabinoxylans, oligosaccharides, spectroscopy, barley, wood



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Denna post skapades 2012-03-06. Senast ändrad 2016-07-15.
CPL Pubid: 155654

 

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Institutioner (Chalmers)

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

Ämnesområden

Materialvetenskap
Organisk kemi

Chalmers infrastruktur