Extraction of hemicelluloses from fiberized spruce wood
Artikel i vetenskaplig tidskrift, 2015

A novel mechanical pre-treatment method was used to separate the wood chips into fiber bundles in order to extract high molecular weight wood polymers. The mechanical pre-treatment involved chip compression in a conical plug-screw followed by defibration in a fiberizer. The fiberized wood was treated with hot water at various combinations of time and temperature in order to analyze the extraction yield of hemicelluloses at different conditions. Nearly 6 mg/g wood of galactoglucomannan was obtained at 90 degrees C/120min which was about three times more than what could be extracted from wood chips. The extracted carbohydrates had molecular weight ranging up to 60 kDa. About 10% of each of the extracted material had a molecular weight above 30 kDa. The extraction liquor could also be reused for consecutive extractions with successive increase in the extraction yield of hemicelluloses.

Fiberized wood

Spruce (Picea abies)


Mechanical pre-treatment


S. Azhar

Kungliga Tekniska Högskolan (KTH)

G. Henriksson

Kungliga Tekniska Högskolan (KTH)

Hans Theliander

Chalmers, Kemi och kemiteknik, Kemiteknik

M. E. Lindstrom

Kungliga Tekniska Högskolan (KTH)

Carbohydrate Polymers

0144-8617 (ISSN)

Vol. 117 19-24





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