Abstract
The distribution of lignans in knots, i.e., the branch bases encased in the stemwood, and in the adjacent stemwood of Norway spruce (Picea abies) was studied. Hydrophilic extracts in samples of three annual rings from the side wood of knots, as well as samples from the surrounding stemwood, were analysed by GC and GC-MS. The knots had an exceptionally high content of lignans (up to 15% w/w), compared to the stemwood (less than 0.05% w/w). The content decreased clearly in the radial direction from the knot pith towards the outerwood, to come down to the same level as in the surrounding stemwood. In the branches, the lignan content also decreased in the radial direction from the branch pith outwards. The lignan content decreased sharply outwards in the branches and came down to the same levels as in the stemwood already 20 cm outside of the stem.
Zusammenfassung
Es wurde die Verteilung von Lignanen in Ästen und im umliegenden Stammholz von Fichte (Picea abies) untersucht. Hydrophile Extrakte in drei Jahrringen von Astproben und dem umgebenden Stammholz wurden mittels GC und GC-MS analysiert. In den Ästen fand sich ein aussergewöhnlich hoher Gehalt an Lignanen (bis zu 15 Gew-%) im Vergleich zum Stammholz (weniger als 0.05 Gew-%). Der Gehalt fiel deutlich in radialer Richtung vom Mark des Astes ab und erreichte aussen den Wert des umgebenden Stammholzes. In Längsrichtung der Äste von aussen erreichen die Werte schon 20 cm vor dem Stamm die Grössenordnung der Stammholzgehalte an Lignanen.
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Willför, S., Sundberg, A., Rehn, P. et al. Distribution of lignans in knots and adjacent stemwood of Picea abies . Holz Roh Werkst 63, 353–357 (2005). https://doi.org/10.1007/s00107-005-0024-5
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DOI: https://doi.org/10.1007/s00107-005-0024-5