Fig. 5From: Characterization of lignin derived from water-only and dilute acid flowthrough pretreatment of poplar wood at elevated temperaturesEffects of pretreatment severity on S, G, and H unit removal by water-only and 0.05 % (w/w) dilute acid pretreatment (poplar wood control sample: G:S:H = 7:11:2)Back to article page