Liquid hot water pretreatment of multi feedstocks and enzymatic hydrolysis of solids obtained thereof.
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.
Centre of Biological Engineering, University of Minho, Campus Gualtar, 4710-057 Braga, Portugal. Electronic address: mimichelin.bio@gmail.com.
Michele
M
Michelin
Centre of Biological Engineering, University of Minho, Campus Gualtar, 4710-057 Braga, Portugal.
José António
JA
Teixeira
D000821:Animal Feed; D002482:Cellulose / Q000737:chemistry / Q000302:isolation & purification*; D005947:Glucose / Q000737:chemistry; D006358:Hot Temperature; D006868:Hydrolysis; D014867:Water; D014961:X-Ray Diffraction; D003313:Zea mays / Q000737:chemistry
D014867:Water; D002482:Cellulose; D005947:Glucose
Autohydrolysis; Cellulose; Lignocellulosic materials; Thermogravimetric analysis; X-ray diffraction