Autor(es): Michelin, Michele ; Teixeira, J. A.
Data: 2016
Identificador Persistente: https://hdl.handle.net/1822/42044
Origem: RepositóriUM - Universidade do Minho
Projeto/bolsa: info:eu-repo/grantAgreement/FCT/5876/147337/PT; info:eu-repo/grantAgreement/FCT/5876-PPCDTI/126270/PT ; info:eu-repo/grantAgreement/FCT/COMPETE/126270/PT;
Assunto(s): Lignocellulosic materials; Autohydrolysis; Cellulose; Thermogravimetric analysis; X-ray diffraction; Science & Technology
Agricultural feedstocks (brewer spent grains 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.
Michele Michelin is a recipient of a Portuguese Foundation for Science and Technology (FCT) fellowship (SFRH/BPD/100786/2014). This study was supported by the FCT under the scope of the strategic funding of UID/BIO/04469/2013 unit, COMPETE 2020 (POCI-01-0145-FEDER-006684) and the Project RECI/BBB-EBI/0179/2012 (FCOMP-01-0124-FEDER-027462). The authors would like to thank Novozymes A/S for samples of Cellic Ctec2.
