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Morphological Origin of Milled Wood Lignin Studied by Radiotracer Method

Para-hydroxyphenyl lignin in compound middle lamella (CML) and syringyl lignin in secondary wall (SW) were labeled with C and H respectively by administration of corresponding lignin precursors, /7-glucocoumaryl alcohol-[side chain-ß-C] and syringin-[aromatic ring-2-H] to a growing stem of magnolia. In another series of experiment, galacturonan in CML and non-condensed guaiacyl moieties in SW lignin were labeled with C and H respectively by administration of D-glucuronic acid-[6-C] and coniferin-[aromatic ring-5-H] to a growing stem of ginkgo. Morphological location of the label in the cell wall was confirmed by microautoradiography. Milled wood lignin (MWL) and lignin-carbohydrate complex (LCC) were prepared from the doubly labeled wood meal. The H/C ratios of the MWL and LCC were higher and lower respectively than that of original wood meal.This indicates that SWlignin is degraded by ball milling more easily to yield MWL than CML lignin.