Autohydrolysis of tropical agricultural residues by compressed liquid hot water pretreatment
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Publication Details
Author list: Imman S., Arnthong J., Burapatana V., Laosiripojana N., Champreda V.
Publisher: Springer
Publication year: 2013
Journal: Applied Biochemistry and Biotechnology (0273-2289)
Volume number: 170
Issue number: 8
Start page: 1982
End page: 1995
Number of pages: 14
ISSN: 0273-2289
eISSN: 1559-0291
Languages: English-Great Britain (EN-GB)
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Abstract
Pretreatment is an essential step in biorefineries for improving digestibility of recalcitrant agricultural feedstocks prior to enzymatic hydrolysis to composite sugars, which can be further converted to fuels and chemicals. In this study, autohydrolysis by compressed liquid hot water (LHW) pretreatment of various tropical agricultural residues including sugarcane bagasse (BG), rice straw (RS), corn stover (CS), and empty palm fruit bunch (EPFB) was investigated. It was found that LHW pretreatment at 200 C for 5-20 min resulted in high levels of hemicellulose solubilization into the liquid phase and marked improvement on enzymatic digestibility of the solid cellulose-enriched residues. The maximal yields of glucose and pentose were 409.8-482.7 mg/g and 81.1-174.0 mg/g of pretreated substrates, respectively. Comparative analysis based on severity factor showed varying susceptibility of biomass to LHW in the order of BG> RS> CS> EPFB. Structural analysis revealed surface modification of the pretreated biomass along with an increase in crystallinity index. Overall, 75.7-82.3 % yield of glucose and 27.4-42.4 % yield of pentose from the dried native biomass was recovered in the pretreated solid residues, while 18.3-29.7 % of pentoses were recovered in the liquid phase with dehydration by-product concentration under the threshold for ethanologens. The results suggest the potential of LHW as an efficient pretreatment strategy for implementation in biorefineries operated using various seasonal agricultural feedstocks. ฉ 2013 Springer Science+Business Media New York.
Keywords
Enzymatic hydrolysis, Lignocelluloses, Liquid hot water
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