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Table 6 Integration of the functional groups of lignin samples from 1H NMR spectra

From: Overcoming biomass recalcitrance by synergistic pretreatment of mechanical activation and metal salt for enhancing enzymatic conversion of lignocellulose

Sample AlOH –OCH3 ArOH COOH CH2 of trioxane
Untreated lignin 2.16 1.87 0.05 0 1.00
MA-pretreated lignin 2.55 1.59 0.08 0.08 1.00
MA + AlCl3 pretreated lignin 2.94 1.17 0.15 0.12 1.00
MA + FeCl3 pretreated lignin 2.70 1.42 0.11 0.09 1.00
MA + Al(NO3)3 pretreated lignin 2.83 1.31 0.12 0.09 1.00
MA + Fe(NO3)3 pretreated lignin 2.87 1.25 0.13 0.11 1.00