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Table 5 Δαmax at 300 and 370 nm of different lignin samples from UV/vis spectra

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

Sample Δαmax at 300 nm Δαmax at 370 nm
Untreated lignin 0.01 1.24
MA-pretreated lignin 4.57 4.15
MA + AlCl3 pretreated lignin 13.46 10.28
MA + FeCl3 pretreated lignin 4.91 4.87
MA + Al(NO3)3 pretreated lignin 6.07 5.49
MA + Fe(NO3)3 pretreated lignin 9.85 8.26