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Lignin distribution in the different fractions. Representation of the codes: 0—pretreatment at 200 °C; 1—pretreatment at 180 °C; A—pretreatment time of 15 min; B—pretreatment of 30 min; 5—50% v/v ethanol content; 6—60% v/v ethanol content; a—no catalyst added; c—1% w/wbiomass H2SO4.
