Coupled enzymatic hydrolysis and ethanol fermentation: ionic liquid pretreatment for enhanced yields

Biotechnology for Biofuels
Venkata Prabhakar SoudhamJyri-Pekka Mikkola

Abstract

Pretreatment is a vital step upon biochemical conversion of lignocellulose materials into biofuels. An acid catalyzed thermochemical treatment is the most commonly employed method for this purpose. Alternatively, ionic liquids (ILs), a class of neoteric solvents, provide unique opportunities as solvents for the pretreatment of a wide range of lignocellulose materials. In the present study, four ionic liquid solvents (ILs), two switchable ILs (SILs) DBU-MEA-SO2 and DBU-MEA-CO2, as well as two 'classical' ILs [Amim][HCO2] and [AMMorp][OAc], were applied in the pretreatment of five different lignocellulosic materials: Spruce (Picea abies) wood, Pine (Pinus sylvestris) stem wood, Birch (Betula pendula) wood, Reed canary grass (RCG, Phalaris arundinacea), and Pine bark. Pure cellulosic substrate, Avicel, was also included in the study. The investigations were carried out in comparison to acid pretreatments. The efficiency of different pretreatments was then evaluated in terms of sugar release and ethanol fermentation. Excellent glucan-to-glucose conversion levels (between 75 and 97 %, depending on the biomass and pretreatment process applied) were obtained after the enzymatic hydrolysis of IL-treated substrates. This corresponded be...Continue Reading

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Citations

Nov 18, 2015·Carbohydrate Polymers·Valerie Eta, Jyri-Pekka Mikkola
Mar 25, 2017·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Qidong HouQian Yang
Mar 17, 2018·International Journal of Molecular Sciences·Nasir MehmoodIsabelle Gosselin
Jul 8, 2016·Chemistry : a European Journal·Roger A Sheldon
Jan 5, 2018·Chemical Reviews·Coby J ClarkeJason P Hallett

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