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Separation of galactoglucomannans, lignin and lignin-carbohydrate complexes from hot-water-extracted Norway spruce by cross-flow filtration and adsorption chromatography

Niklas Westerberg (Institutionen för kemi- och bioteknik, Kemisk apparatteknik) ; Hampus Sunner (Institutionen för kemi- och bioteknik, Industriell Bioteknik ) ; Henriksson Gunnar ; Helander Mikaela ; Lawoko Martin ; Anders Rasmuson (Institutionen för kemi- och bioteknik, Kemisk apparatteknik)
BioResources (1930-2126). Vol. 7 (2012), 4, p. 4501-4516.
[Artikel, refereegranskad vetenskaplig]

A simple method to simultaneously recover polymeric carbohydrates, mainly galactoglucomannans (GGM), lignin, and lignin-carbohydrate complex (LCC) from hot-water-extracted Norway spruce wood is presented. The isolation method consists of cross-flow filtration, where high and low molecular mass species are removed, followed by fixed-bed adsorption on a hydrophobic polymeric resin (XAD-16) to remove lignins and lignans. In the second step of fixed-bed adsorption, a phenylic reversed-phase analytical chromatography column, where mass transport resistance is minimized and a very high selectivity towards aromatic compounds have been observed, was used to separate LCC from GGM. The isolated LCC fraction contained about 10% aromatics, whereas the upgraded GGM fraction contained about 1.5% aromatics and the lignin fraction contained about 56% aromatics. Polymeric xylan was accumulated in the GGM fraction, while mannose was the dominant sugar found in the LCC fraction. As products, approximately 7% was recovered in the lignin fraction in the first adsorptive step, 5% was recovered as LCC, and 88% as upgraded hemicelluloses.

Nyckelord: LCC; Lignin carbohydrate complex; GGM; galactoglucomannan; Norway spruce; Biorefinery; Separation; Sorption; Chromatography; Ultrafiltration



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Denna post skapades 2012-12-19. Senast ändrad 2016-05-24.
CPL Pubid: 168318

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Kemisk apparatteknik (2005-2014)
Institutionen för kemi- och bioteknik, Industriell Bioteknik (2008-2014)

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