Abstract
The lipophilic extractives, that is, wood resin, in Populus grandidentata (bigtooth aspen) and Populus tremuloides (quaking aspen) sapwood, heartwood, and knots were analyzed. The amount and composition of the extractives in sapwood were similar in both species. Triglycerides, short‐chain fatty acids, and steryl esters were predominant in sapwood samples. The knots of both species contained similar amounts of extractives as the stemwood, but the composition was quite different. Monoglycerides; long‐chain fatty acids and alcohols, with 22 to 28 carbon atoms; hydroxy fatty acids; and ferulic acid esters of fatty alcohols were the major components in heartwood and knots, but were minor components in the sapwood. This work was carried out within the project “BioExtra” funded by the National Technology Agency of Finland (Tekes), Raisio Group, and UPM. This work is part of the activities at the Åbo Akademi Process Chemistry Centre within the Finnish Centre of Excellence Programme (2000–2005) selected by the Academy of Finland. Markku Reunanen is acknowledged for his skillful help with the GC‐MS analyses and Donald and Peter MacNeil are acknowledged for their help with the sampling of the trees.
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