Single-step microwave-assisted hot water extraction of hemicelluloses from selected lignocellulosic materials – A biorefinery approach. (October 2017)

• Record Type: Journal Article
• Authors: Mihiretu, Gezahegn T.; Brodin, Malin; Chimphango, Annie F.; Øyaas, Karin; Hoff, Bård H.; Görgens, Johann F.
• Is Part Of: Bioresource technology. Volume 241(2017)
• Page Start: 669
• Page End: 680
• Publication Date: 2017-10
• Subjects: Lignocellulosic biorefinery -- Hemicellulose extraction -- Aspenwood -- Sugarcane trash -- Microwave-assisted pressurized hot water method; 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.2017.05.159
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Xylan extraction yields for aspenwood and sugarcane trash were significant. Less than 7% monomeric xylose yield was obtained for both feedstocks. Xylan extraction and cellulose digestibility were mainly influenced by temperature. Enzymatic digestibility of both feedstocks was significantly improved. Microwave-assisted hot water method as a viable biorefinery approach. Abstract: The viability of single-step microwave-induced pressurized hot water conditions for co-production of xylan-based biopolymers and bioethanol from aspenwood sawdust and sugarcane trash was investigated. Extraction of hemicelluloses was conducted using microwave-assisted pressurized hot water system. The effects of temperature and time on extraction yield and enzymatic digestibility of resulting solids were determined. Temperatures between 170–200 °C for aspenwood and 165–195 °C for sugarcane trash; retention times between 8–22 min for both feedstocks, were selected for optimization purpose. Maximum xylan extraction yields of 66 and 50%, and highest cellulose digestibilities of 78 and 74%, were attained for aspenwood and sugarcane trash respectively. Monomeric xylose yields for both feedstocks were below 7%, showing that the xylan extracts were predominantly in non-monomeric form. Thus, single-step microwave-assisted hot water method is viable biorefinery approach to extract xylan from lignocelluloses while rendering the solid residues sufficiently digestible for ethanol production.