Separation of galactoglucomannans, lignin and lignin-carbohydrate complexes from hot-water-extracted Norway spruce by cross-flow filtration and adsorption chromatography
Journal article, 2012

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.

Lignin carbohydrate complex

Biorefinery

Separation

Norway spruce

Chromatography

Ultrafiltration

LCC

Sorption

GGM

galactoglucomannan

Author

Niklas Westerberg

Chalmers, Chemical and Biological Engineering, Chemical Engineering Design

Hampus Sunner

Chalmers, Chemical and Biological Engineering, Industrial biotechnology

Henriksson Gunnar

Helander Mikaela

Lawoko Martin

Anders Rasmuson

Chalmers, Chemical and Biological Engineering, Chemical Engineering Design

Wallenberg Wood Science Center (WWSC)

BioResources

1930-2126 (ISSN)

Vol. 7 4 4501-4516

Areas of Advance

Production

Energy

Subject Categories

Chemical Engineering

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Latest update

8/27/2018