Fig. 2

Influence of 2-naphthol admixture to steam pretreatment on enzymatic cellulose digestibility. a Steam explosion pretreatment without additive (control) and with admixed 2-naphthol. b Steam explosion pretreatment with admixed 2-naphthol, carried out with and without explosive decompression. Digestibility is expressed as glucose yield of pretreated biomass content. Pretreatment conditions: T = 235 °C, t = 2.5–20 min, Δp explosion = 30 bar, 1.5 kg wood chips, 35.36 g 2-naphthol; hydrolysis conditions: 1% w/w cellulose, 15/30/60 FPU g⁻¹ cellulose