Lignin in douglas fir: Composition of the middle lamella

Scanning UV microspectrophotometry as a tool to study the changes of lignin in hydrothermally modified wood

“…The presence of native lignin in woody cell woods was first demonstrated by UV methods (Bailey 1936;Lange 1944). A huge progress has been achieved in this field since the 1970s (Scott et al 1969;Fergus and Goring 1970a,b;Musha and Goring 1975).…”

Topochemie der Delignifizierung beim Aufschluß von Fichtenholz nach dem Sulfit- und Sulfatverfahren. Teil I: Ultraviolett-mikroskopische Untersuchungen an teilweise delignifiziertem Fichtenholz

“…The synthesis of 14 C-labeled lignin precursors and their utilization to study lignin f ormation by means of radioautography have been described by Freudenberg (5) and Kr atz l (9). They have shown that lignin precursors can be introduced into spruce shoots and become incorporated in a few layers of cells behind the cambium.…”

A Lignin-Carbohydrate Complex in Wood A Review of the Literature

“…It was claimed by Harlow (62) that the latter Statement was still correct for parenchymatous tissue, but that in woody tissues the middle lamella is heavily lignified. Further evidence on this subject was produced by Bailey (7) who was able to demonstrate that the middle lamella consists mainly of lignin by actually separating half a milligramme of middle lamella from Douglas Fir with the aid of a micromanipulator, and analysing it. This sample was found to contain 71% lignin, and in a subsequent paper (8) a similar sample was found to contain 14% pentosan together with 4% cellulose, the presence of the latter being presumed to be due to incomplete Separation by the micromanipulator.…”