The phenolic hydroxyl content of lignin in spruce wood

Values of the phenolic hydroxyl content of the lignin in the secondary wall and cell corner middle lamella of the tracheids in black spruce wood were found by ultraviolet microscopy to be 0.12 and 0.06 PhOH/C 9 respectively. The overall value for the lignin in black spruce wood was 0.10 PhOH/C 9 .