Fig. 6From: Performance of three delignifying pretreatments on hardwoods: hydrolysis yields, comprehensive mass balances, and lignin propertiesQuantified lignin properties for pretreatment-solubilized lignins and reference “native” cellulolytic lignin (CEL lignin), including a SEC-estimated weight and number average molar masses, b β-O-4 content determined by 13C NMR, and c HSQC NMR-determined relative abundances of interunit linkages within the lignins. “Pre-Extr.” refers to the alkaline pre-extraction step or the first stage of the Cu-AHP process, while “Cu-AHP” refers to the second step or the alkaline oxidative Cu-AHP stageBack to article page