Fig. 4From: Chemical and structural changes associated with Cu-catalyzed alkaline-oxidative delignification of hybrid poplarSEC elution profiles for plant cell wall polymers solubilized during pretreatments referenced to elution times for polystyrene standards. For reference, the phenolic monomers vanillin, vanillic acid, syringaldehyde, syringic acid, and p-hydroxybenzoic acid elute at elution volumes between 9.1 and 9.35 mL.Back to article page