In lumber, particleboard, and MDF,
which have higher glucomannan content, the concentration of
mannose was higher than that of xylose. On the other hand, plywood
contained a high level of xylan, which revealed a high xylose
content. As MDF is a wood product made from wood fibers broken
down from hardwood and softwood residuals, milled MDF has a
lower density than the other waste woods. This characteristic
caused a problem in the process of acid hydrolysis. As most of
the sulfuric acid solution was used for the wetting of the milled
MDF, more sulfuric acid solution was needed for the hydrolysis,
which lowered the sugars concentration of the MDF hydrolysate
due to the dilution effect.