Abstract
The specific characteristics of biomass structure and differences in chemical composition of soybean hull (SBH) and soybean straw (SBS) may result in different behavior of pretreatment and enzymatic hydrolysis. In this work, dilute sulfuric acid (DA) pretreatment and alkaline sodium hydroxide (AL) pretreatment in a range of pretreatment temperatures and durations were investigated to improve the enzymatic digestibility of SBH and SBS. Satisfactory enzymatic digestibility was observed in the hydrolysis of both pretreated soybean fractions, but SBH showed higher digestibility than that of SBS, no matter which pretreatment technology was applied. Furthermore, DA pretreatment was more effective than AL pretreatment in conversion of soybean fractions into fermentable sugars, if both pretreatment and enzymatic hydrolysis stages were considered. The highest total sugar yield of SBH and SBS using DA pretreatment and subsequently hydrolyzed with 30 FPU/g-DM cellulase were 86.9% and 70.3%, respectively.
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