Distribution of lignans in knots and adjacent stemwood of Picea abies

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… (More)