Liquid hot water pretreatment of multi feedstocks and enzymatic hydrolysis of solids obtained thereof. (September 2016)

• Record Type: Journal Article
• Authors: Michelin, Michele; Teixeira, José António
• Is Part Of: Bioresource technology. Volume 216(2016)
• Page Start: 862
• Page End: 869
• Publication Date: 2016-09
• Subjects: Lignocellulosic materials -- Autohydrolysis -- Cellulose -- Thermogravimetric analysis -- X-ray diffraction; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2016.06.018
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Chemical composition showed different susceptibility of multi feedstocks to LHW. LHW improved thermal properties and structural characteristics of multi feedstocks. The crystallinity degree of multi feedstocks increased after LHW-pretreatment. Cellulose conversion to glucose rate was higher in brewers' spent grain and corn husk. Abstract: Agricultural feedstocks (brewers' spent grain – BSG, corncob – CC, corn husk – CH, wheat straw – WS and Luffa sponge – LS) were pretreated by liquid hot water (LHW) in order to increase cellulose recovery and enzymatic saccharification. LHW-pretreatment resulted in hemicellulose solubilization, and solids enriched in cellulose. Chemical analysis showed different susceptibilities of the feedstocks to LHW-pretreatment and enzymatic hydrolysis. Pretreated feedstocks presented higher crystallinity (determined through X-ray diffraction) and thermal stability (determined through thermogravimetric analysis) than untreated feedstocks. SEM images confirmed the effect of LHW-pretreatment on structural changes. Moreover, enzymatic hydrolysis and cellulose conversion to glucose (CCG) were improved for pretreated feedstocks, with exception of LS. CCG (in relation to glucose potential on solids) followed the order: BSG > CH > WS > CC > LS. LHW-pretreatment showed to be a good technology to pretreat multi feedstocks and for improving the enzymatic hydrolysis of recalcitrant agricultural feedstocks to sugars, which can be further converted to ethanol-fuel and other value-added chemicals.