Spruce glucomannan: Preparation, structural characteristics and basic film forming ability
Journal article, 2013

In this study one representative hemicellulose in spruce wood, low galactosyl substituted glucomannan (GM), has been prepared and purified from holocellulose by NaOH/H3BO4 extraction, Fehling reagent precipitation and HCl regeneration. The GM structure obtained was comprehensively characterized by FTIR, hydrolysis-IC, SEC, and various solution- and solid state NMR spectroscopies. In addition, two pretreatment methods have been evaluated to form films from the GM. It was found that the spruce GM is composed of galactose, glucose and mannose in a ratio of 0.03:1:3.4. The molecular masses are around 255 kDa (Mw) against pullulan standards. The GM was almost free from other polysaccharides such as xylan (0.61%) and free from metal ions (<0.2% ash content). After blending with glycerol or pre-acetylation, two yellowish transparent films have been obtained after solution casting. For the former, water affinity was observed while for the latter water resistance was noticed. Potential high value applications of this GM include packaging and coatings in food and pharmaceutical industry.

Film casting

Spruce glucomannan

Purification

Structure

Characterization

Author

Yujia Zhang

Royal Institute of Technology (KTH)

Jiebing Li

Royal Institute of Technology (KTH)

Mikael E. Lindstrom

Royal Institute of Technology (KTH)

Agnes Stépán

Chalmers, Chemical and Biological Engineering, Polymer Technology

Paul Gatenholm

Wallenberg Wood Science Center (WWSC)

Chalmers, Chemical and Biological Engineering, Polymer Technology

Nordic Pulp and Paper Research Journal

0283-2631 (ISSN)

Vol. 28 3 323-330

Subject Categories

Paper, Pulp and Fiber Technology

DOI

10.3183/NPPRJ-2013-28-03-p323-330

More information

Latest update

8/27/2018