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Distribution and characterisation of discolouring substances in Norway spruce (Picea abies L. Karst.) pulp wood stored under water sprinkling by Lars Hildén; Jing Zhang; Erik Persson; Gunnar Johansson; Jonas Brändström is a Engineering article available to read on EtoBox.

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## Abstract Discolouration of wood raw material during wet storage has a notable negative effect on the quality of the final product. In this study, fluorescence microscopy was used to investigate the spatial distribution of discolouring substances in water-sprinkled Norway spruce pulpwood. Water-sprinkled wood was characterised by the presence of discolouring substances on the pit membranes of wood cells. __In vitro__ model studies on the interaction between a model bark substance (tannic acid) and torus constituents support the hypothesis that pectic structures facilitate the allocation of bark substances on pit membranes. Applied pectinase or tannase could not remove the discolouring substances from pit membranes. Manganese peroxidase had a minor but documented effect. The effect of manganese peroxidase, as well as HCl/vanillin labelling, indicated that the discolouring substance may be condensed tannins.

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Author

Lars Hildén; Jing Zhang; Erik Persson; Gunnar Johansson; Jonas Brändström

Publisher

Walter de Gruyter GmbH

Published

2006

Language

EN

Field

Engineering (Physical Sciences)