Mushroom spent straw: a potential substrate for an ethanol-based biorefinery |
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Authors: | Venkatesh Balan Leonardo da Costa Sousa Shishir P S Chundawat Ramin Vismeh A Daniel Jones Bruce E Dale |
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Institution: | (1) Biomass Conversion Research Lab (BCRL), Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA;(2) Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA;(3) Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, USA |
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Abstract: | Rice straw (RS) is an important lignocellulosic biomass with nearly 800 million dry tons produced annually worldwide. RS has
immense potential as a lignocellulosic feedstock for making renewable fuels and chemicals in a biorefinery. However, because
of its natural recalcitrance, RS needs thermochemical treatment prior to further biological processing. Ammonia fiber expansion
(AFEX) is a leading biomass pretreatment process utilizing concentrated/liquefied ammonia to pretreat lignocellulosic biomass
at moderate temperatures (70–140°C). Previous research has shown improved cellulose and hemicellulose conversions upon AFEX
treatment of RS at 2:1 ammonia to biomass (w/w) loading, 40% moisture (dwb) and 90°C. However, there is still scope for further
improvement. Fungal pretreatment of lignocellulosics is an important biological pretreatment method that has not received
much attention in the past. A few reasons for ignoring fungal-based pretreatments are substantial loss in cellulose and hemicellulose
content and longer pretreatment times that reduce overall productivity. However, the sugar loss can be minimized through use
of white-rot fungi (e.g. Pleutorus ostreatus) over a much shorter duration of pretreatment time. It was found that mushroom spent RS prior to AFEX allowed reduction in
thermochemical treatment severity, while resulting in 15% higher glucan conversions than RS pretreated with AFEX alone. In
this work, we report the effect of fungal conditioning of RS followed by AFEX pretreatment and enzymatic hydrolysis. The recovery
of other byproducts from the fungal conditioning process such as fungal enzymes and mushrooms are also discussed.
JIMB-2008: BioEnergy—Special issue. |
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Keywords: | Mushroom spent rice straw Cellulase enzymatic hydrolysis AFEX pretreatment Lignocellulosic biomass |
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