Cellular level distributions of Scots pine heartwood and knot heartwood extractives revealed by Raman spectroscopy imaging

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2017-12-01

Department

Department of Bioproducts and Biosystems

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Language

en

Pages

9

Series

Industrial Crops and Products, Volume 108, pp. 327-335

Abstract

Wood extractives are biologically active secondary metabolites that help protect wood and wood products from decay and other forms of biological attack. Despite the influence of distribution on their ability to protect wood, very few studies have investigated the distributions of extractives on a cellular level. In this paper, the distributions of extractives were studied in Scots pine (Pinus sylvestris L.) heartwood (HW) and knot heartwood by confocal Raman spectroscopy imaging. Pinosylvins, the antifungal phenolic extractives of pine, were found to be present in the cell walls, middle lamella, and lumina of tracheids. Their distribution suggested the existence of two different mechanisms of deposition and revealed similarities to the distribution of lignin. The potential binding of pinosylvins to lignin and their relatively low concentration in HW cell walls could explain why Scots pine HW is, on average, only moderately resistant to decay. Resin acids, the most abundant group of extractives in pine, were detected only within the lumina of tracheids and ray cells, where they may contribute to the reduced permeability of HW. The extractives distributions presented here help us understand the properties of HW and provide a deeper understanding of the origins of natural durability, which is of value in the current efforts to develop more environmentally friendly means of wood protection.

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Keywords

Extractives, Heartwood, Imaging, Pinosylvin, Raman spectroscopy, Scots pine

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DOI

10.1016/j.indcrop.2017.06.056

Citation

Belt, T, Keplinger, T, Hänninen, T & Rautkari, L 2017, 'Cellular level distributions of Scots pine heartwood and knot heartwood extractives revealed by Raman spectroscopy imaging', Industrial Crops and Products, vol. 108, pp. 327-335. https://doi.org/10.1016/j.indcrop.2017.06.056

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https://urn.fi/URN:NBN:fi:aalto-201708036356

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[article-cris] Kemian tekniikan korkeakoulu / CHEM