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Araya-Farias M, Husson E, Saavedra-Torrico J, Gérard D, Roulard R, Gosselin I, Rakotoarivonina H, Lambertyn V, Rémond C, Sarazin C. Wheat Bran Pretreatment by Room Temperature Ionic Liquid-Water Mixture: Optimization of Process Conditions by PLS-Surface Response Design. Front Chem 2019; 7:585. [PMID: 31508408 PMCID: PMC6716547 DOI: 10.3389/fchem.2019.00585] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 08/05/2019] [Indexed: 01/22/2023] Open
Abstract
Room Temperature Ionic Liquids (RTILs) pretreatment are well-recognized to improve the enzymatic production of platform molecules such as sugar monomers from lignocellulosic biomass (LCB). The conditions for implementing this key step requires henceforth optimization to reach a satisfactory compromise between energy saving, required RTIL amount and hydrolysis yields. Wheat bran (WB) and destarched wheat bran (DWB), which constitute relevant sugar-rich feedstocks were selected for this present study. Pretreatments of these two distinct biomasses with various 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc])-water mixtures prior to hydrolysis catalyzed by hemicellulolytic cocktail (Cellic CTec2) were finely investigated. The main operating conditions such as pretreatment temperature (25–150°C), time (40–180 min), WB and DWB loading (2–5% w/v) and concentration of [C2mim][OAc] in water [10–100% (v/v)] were screened through glucose and xylose yields and then optimized through a Partial Least Square (PLS)—Second Order Design. In an innovative way, the PLS results showed that the four factors and their interactions could be well-fitted by a second-order model (p < 0.05). The quadratic PLS models were used to predict optimal pretreatment conditions. Thus, maximum glucose (83%) and xylose (95%) yields were obtained from enzymatic hydrolysis of WB pretreated at 150°C for 40 min with 10% of [C2mim][OAc] in water and 5% of WB loading. For DWB, maximum glucose (100%) and xylose (57%) yields were achieved for pretreatment temperatures of 150°C and 25°C, respectively. The required duration was still 40 min, with 20% of [C2mim][OAc] in water and a 5% DWB loading. Then, Multiple Response Optimization (MRO) performed by Nelder-Mead Simplex Method displayed sugar yields similar to those obtained by individual PLS optimization. This complete statistical study confirmed that the established models were appropriate to predict the sugar yields achieved after different pretreatment conditions from WB and DWB biomasses. Finally, Scanning Electron microscopy (SEM) studies allowed us to establish clearer link between structural changes induced by pretreatment and the best enzymatic performances obtained.
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Affiliation(s)
- Monica Araya-Farias
- Unité de Génie Enzymatique et Cellulaire, UMR 7025 CNRS, Université de Picardie Jules Verne, Amiens, France
| | - Eric Husson
- Unité de Génie Enzymatique et Cellulaire, UMR 7025 CNRS, Université de Picardie Jules Verne, Amiens, France
| | - Jorge Saavedra-Torrico
- Escuela de Ingenieria de Alimentos, Pontificia Universidad Catolica de Valparaíso, Valparaíso, Chile
| | - Doriane Gérard
- Chaire AFERE, UMR Fractionnement des AgroRessources et Environnement 614 INRA, Université de Reims Champagne-Ardenne, Reims, France
| | - Romain Roulard
- Plate-forme de Microscopie Electronique, Université de Picardie Jules Verne, Amiens, France
| | - Isabelle Gosselin
- Unité de Génie Enzymatique et Cellulaire, UMR 7025 CNRS, Université de Picardie Jules Verne, Amiens, France
| | - Harivoni Rakotoarivonina
- Chaire AFERE, UMR Fractionnement des AgroRessources et Environnement 614 INRA, Université de Reims Champagne-Ardenne, Reims, France
| | - Virginie Lambertyn
- Unité de Génie Enzymatique et Cellulaire, UMR 7025 CNRS, Université de Picardie Jules Verne, Amiens, France
| | - Caroline Rémond
- Chaire AFERE, UMR Fractionnement des AgroRessources et Environnement 614 INRA, Université de Reims Champagne-Ardenne, Reims, France
| | - Catherine Sarazin
- Unité de Génie Enzymatique et Cellulaire, UMR 7025 CNRS, Université de Picardie Jules Verne, Amiens, France
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Regestein L, Klement T, Grande P, Kreyenschulte D, Heyman B, Maßmann T, Eggert A, Sengpiel R, Wang Y, Wierckx N, Blank LM, Spiess A, Leitner W, Bolm C, Wessling M, Jupke A, Rosenbaum M, Büchs J. From beech wood to itaconic acid: case study on biorefinery process integration. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:279. [PMID: 30337958 PMCID: PMC6180396 DOI: 10.1186/s13068-018-1273-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Accepted: 09/26/2018] [Indexed: 05/28/2023]
Abstract
Renewable raw materials in sustainable biorefinery processes pose new challenges to the manufacturing routes of platform chemicals. Beside the investigations of individual unit operations, the research on process chains, leading from plant biomass to the final products like lactic acid, succinic acid, and itaconic acid is increasing. This article presents a complete process chain from wooden biomass to the platform chemical itaconic acid. The process starts with the mechanical pretreatment of beech wood, which subsequently is subjected to chemo-catalytic biomass fractionation (OrganoCat) into three phases, which comprise cellulose pulp, aqueous hydrolyzed hemicellulose, and organic lignin solutions. Lignin is transferred to further chemical valorization. The aqueous phase containing oxalic acid as well as hemi-cellulosic sugars is treated by nanofiltration to recycle the acid catalyst back to the chemo-catalytic pretreatment and to concentrate the sugar hydrolysate. In a parallel step, the cellulose pulp is enzymatically hydrolyzed to yield glucose, which-together with the pentose-rich stream-can be used as a carbon source in the fermentation. The fermentation of the sugar fraction into itaconic acid can either be performed with the established fungi Aspergillus terreus or with Ustilago maydis. Both fermentation concepts were realized and evaluated. For purification, (in situ) filtration, (in situ) extraction, and crystallization were investigated. The presented comprehensive examination and discussion of the itaconate synthesis process-as a case study-demonstrates the impact of realistic process conditions on product yield, choice of whole cell catalyst, chemocatalysts and organic solvent system, operation mode, and, finally, the selection of a downstream concept.
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Affiliation(s)
- Lars Regestein
- AVT—Bio-chemical Engineering, RWTH Aachen University, Forckenbeckstr. 51, 52074 Aachen, Germany
- Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute, Adolf-Reichwein-Str. 23, 07745 Jena, Germany
| | - Tobias Klement
- AVT—Bio-chemical Engineering, RWTH Aachen University, Forckenbeckstr. 51, 52074 Aachen, Germany
- Center of Molecular Transformations, RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany
| | - Philipp Grande
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52064 Aachen, Germany
- Institut für Bio- und Geowissenschaften, Pflanzenwissenschaften (IBG-2), Forschungszentrum Jülich, Wilhelm-Johnen-Straße, 52425 Jülich, Germany
| | - Dirk Kreyenschulte
- AVT—Bio-chemical Engineering, RWTH Aachen University, Forckenbeckstr. 51, 52074 Aachen, Germany
| | - Benedikt Heyman
- AVT—Bio-chemical Engineering, RWTH Aachen University, Forckenbeckstr. 51, 52074 Aachen, Germany
| | - Tim Maßmann
- AVT—Fluid Process Engineering, RWTH Aachen University, Forckenbeckstr. 51, 52074 Aachen, Germany
| | - Armin Eggert
- AVT—Fluid Process Engineering, RWTH Aachen University, Forckenbeckstr. 51, 52074 Aachen, Germany
| | - Robert Sengpiel
- AVT—Chemical Process Engineering, RWTH Aachen University, Forckenbeckstr. 51, 52074 Aachen, Germany
| | - Yumei Wang
- AVT—Enzyme Process Technology, RWTH Aachen University, Forckenbeckstr. 51, 52074 Aachen, Germany
| | - Nick Wierckx
- iAMB-Institute of Applied Microbiology, RWTH Aachen University, Worringerweg 1, 52064 Aachen, Germany
| | - Lars M. Blank
- iAMB-Institute of Applied Microbiology, RWTH Aachen University, Worringerweg 1, 52064 Aachen, Germany
| | - Antje Spiess
- AVT—Enzyme Process Technology, RWTH Aachen University, Forckenbeckstr. 51, 52074 Aachen, Germany
- Institut für Bioverfahrenstechnik, Technische Universität Braunschweig, Rebenring 56, 38106 Brunswick, Germany
| | - Walter Leitner
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52064 Aachen, Germany
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Carsten Bolm
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Matthias Wessling
- AVT—Chemical Process Engineering, RWTH Aachen University, Forckenbeckstr. 51, 52074 Aachen, Germany
| | - Andreas Jupke
- AVT—Fluid Process Engineering, RWTH Aachen University, Forckenbeckstr. 51, 52074 Aachen, Germany
| | - Miriam Rosenbaum
- iAMB-Institute of Applied Microbiology, RWTH Aachen University, Worringerweg 1, 52064 Aachen, Germany
- Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute, Adolf-Reichwein-Str. 23, 07745 Jena, Germany
| | - Jochen Büchs
- AVT—Bio-chemical Engineering, RWTH Aachen University, Forckenbeckstr. 51, 52074 Aachen, Germany
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Husson E, Auxenfans T, Herbaut M, Baralle M, Lambertyn V, Rakotoarivonina H, Rémond C, Sarazin C. Sequential and simultaneous strategies for biorefining of wheat straw using room temperature ionic liquids, xylanases and cellulases. BIORESOURCE TECHNOLOGY 2018; 251:280-287. [PMID: 29288956 DOI: 10.1016/j.biortech.2017.12.047] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 12/15/2017] [Accepted: 12/16/2017] [Indexed: 06/07/2023]
Abstract
Sequential and simultaneous strategies for fractioning wheat straw were developed in combining 1-ethyl-3-methyl imidazolium acetate [C2mim][OAc], endo-xylanases from Thermobacillus xylanilyticus and commercial cellulases. After [C2mim][OAc]-pretreatment, hydrolysis catalyzed by endo-xylanases of wheat straw led to efficient xylose production with very competitive yield (97.6 ± 1.3%). Subsequent enzymatic saccharification allowed achieving a total degradation of cellulosic fraction (>99%). These high performances revealed an interesting complementarity of [C2mim][OAc]- and xylanase-pretreatments for increasing enzymatic digestibility of cellulosic fraction in agreement with the structural and morphological changes of wheat straw induced by each of these pretreatment steps. In addition a higher tolerance of endo-xylanases from T. xylaniliticus to [C2mim][AcO] until 30% v/v than cellulases from T. reesei was observed. Based on this property, a simultaneous strategy combining [C2mim][OAc]- and endo-xylanases as pretreatment in a one-batch produced xylose with similar yield than those obtained by the sequential strategy.
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Affiliation(s)
- Eric Husson
- Unité de Génie Enzymatique et Cellulaire, FRE 3580 CNRS, Université de Picardie Jules Verne, 33 rue Saint-Leu, 80039 Amiens Cedex, France
| | - Thomas Auxenfans
- Unité de Génie Enzymatique et Cellulaire, FRE 3580 CNRS, Université de Picardie Jules Verne, 33 rue Saint-Leu, 80039 Amiens Cedex, France
| | - Mickael Herbaut
- Unité de Génie Enzymatique et Cellulaire, FRE 3580 CNRS, Université de Picardie Jules Verne, 33 rue Saint-Leu, 80039 Amiens Cedex, France
| | - Manon Baralle
- UMR FARE 614 Fractionnement des AgroRessources et Environnement, Chaire AFERE, Université de Reims-Champagne-Ardenne, INRA, 51686 Reims Cedex, France
| | - Virginie Lambertyn
- Unité de Génie Enzymatique et Cellulaire, FRE 3580 CNRS, Université de Picardie Jules Verne, 33 rue Saint-Leu, 80039 Amiens Cedex, France
| | - Harivoni Rakotoarivonina
- UMR FARE 614 Fractionnement des AgroRessources et Environnement, Chaire AFERE, Université de Reims-Champagne-Ardenne, INRA, 51686 Reims Cedex, France
| | - Caroline Rémond
- UMR FARE 614 Fractionnement des AgroRessources et Environnement, Chaire AFERE, Université de Reims-Champagne-Ardenne, INRA, 51686 Reims Cedex, France
| | - Catherine Sarazin
- Unité de Génie Enzymatique et Cellulaire, FRE 3580 CNRS, Université de Picardie Jules Verne, 33 rue Saint-Leu, 80039 Amiens Cedex, France.
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Nemestóthy N, Megyeri G, Bakonyi P, Lakatos P, Koók L, Polakovic M, Gubicza L, Bélafi-Bakó K. Enzyme kinetics approach to assess biocatalyst inhibition and deactivation caused by [bmim][Cl] ionic liquid during cellulose hydrolysis. BIORESOURCE TECHNOLOGY 2017; 229:190-195. [PMID: 28113078 DOI: 10.1016/j.biortech.2017.01.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 01/04/2017] [Accepted: 01/05/2017] [Indexed: 06/06/2023]
Abstract
The aim of this work was to study the inhibition and deactivation of commercial enzyme cocktail (Cellic® Htec2) in the presence of [bmim][Cl] ionic liquid employing model cellulosic substrate, carboxymethyl cellulose (CMC). It turned out from the experiments - relying on enzyme kinetics approach - that [bmim][Cl] could act as a competitive inhibitor. Furthermore, depending on the process conditions i.e. contact of enzyme solution with high concentration [bmim][Cl], severe biocatalyst inactivation should be also taken into account as a potential risk during the enzymatic cellulose hydrolysis even in as short process times as few minutes.
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Affiliation(s)
- Nándor Nemestóthy
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary
| | - Gábor Megyeri
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary
| | - Péter Bakonyi
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary
| | - Patrik Lakatos
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary
| | - László Koók
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary
| | - Milan Polakovic
- Department of Chemical and Biochemical Engineering, Institute of Chemical and Environmental Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, Bratislava 81237, Slovakia
| | - László Gubicza
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary
| | - Katalin Bélafi-Bakó
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary.
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Patel H, Divecha J, Shah A. Microwave assisted alkali treated wheat straw as a substrate for co-production of (hemi)cellulolytic enzymes and development of balanced enzyme cocktail for its enhanced saccharification. J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2016.12.032] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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Organosolv Processes. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2017; 166:153-176. [DOI: 10.1007/10_2016_61] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Elgharbawy AA, Alam MZ, Moniruzzaman M, Goto M. Ionic liquid pretreatment as emerging approaches for enhanced enzymatic hydrolysis of lignocellulosic biomass. Biochem Eng J 2016. [DOI: 10.1016/j.bej.2016.01.021] [Citation(s) in RCA: 166] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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8
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Parviainen A, Wahlström R, Liimatainen U, Liitiä T, Rovio S, Helminen JKJ, Hyväkkö U, King AWT, Suurnäkki A, Kilpeläinen I. Sustainability of cellulose dissolution and regeneration in 1,5-diazabicyclo[4.3.0]non-5-enium acetate: a batch simulation of the IONCELL-F process. RSC Adv 2015. [DOI: 10.1039/c5ra12386k] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A laboratory batch simulation of the recovery and reuse of [DBNH][OAc] in the IONCELL-F process, yielding future directions for optimising the recycling process.
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Affiliation(s)
- A. Parviainen
- Department of Chemistry
- University of Helsinki
- 00014 Helsinki
- Finland
| | - R. Wahlström
- VTT – Technical Research Centre of Finland
- 02044 Espoo
- Finland
| | - U. Liimatainen
- Department of Chemistry
- University of Helsinki
- 00014 Helsinki
- Finland
| | - T. Liitiä
- VTT – Technical Research Centre of Finland
- 02044 Espoo
- Finland
| | - S. Rovio
- VTT – Technical Research Centre of Finland
- 02044 Espoo
- Finland
| | | | - U. Hyväkkö
- Department of Chemistry
- University of Helsinki
- 00014 Helsinki
- Finland
| | - A. W. T. King
- Department of Chemistry
- University of Helsinki
- 00014 Helsinki
- Finland
| | - A. Suurnäkki
- VTT – Technical Research Centre of Finland
- 02044 Espoo
- Finland
| | - I. Kilpeläinen
- Department of Chemistry
- University of Helsinki
- 00014 Helsinki
- Finland
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Akinosho H, Yee K, Close D, Ragauskas A. The emergence of Clostridium thermocellum as a high utility candidate for consolidated bioprocessing applications. Front Chem 2014; 2:66. [PMID: 25207268 PMCID: PMC4143619 DOI: 10.3389/fchem.2014.00066] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 07/28/2014] [Indexed: 01/25/2023] Open
Abstract
First isolated in 1926, Clostridium thermocellum has recently received increased attention as a high utility candidate for use in consolidated bioprocessing (CBP) applications. These applications, which seek to process lignocellulosic biomass directly into useful products such as ethanol, are gaining traction as economically feasible routes toward the production of fuel and other high value chemical compounds as the shortcomings of fossil fuels become evident. This review evaluates C. thermocellum's role in this transitory process by highlighting recent discoveries relating to its genomic, transcriptomic, proteomic, and metabolomic responses to varying biomass sources, with a special emphasis placed on providing an overview of its unique, multivariate enzyme cellulosome complex and the role that this structure performs during biomass degradation. Both naturally evolved and genetically engineered strains are examined in light of their unique attributes and responses to various biomass treatment conditions, and the genetic tools that have been employed for their creation are presented. Several future routes for potential industrial usage are presented, and it is concluded that, although there have been many advances to significantly improve C. thermocellum's amenability to industrial use, several hurdles still remain to be overcome as this unique organism enjoys increased attention within the scientific community.
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Affiliation(s)
- Hannah Akinosho
- School of Chemistry and Biochemistry, Institute of Paper Science and Technology, Georgia Institute of Technology Atlanta, GA, USA ; Oak Ridge National Laboratory, BioEnergy Science Center Oak Ridge, TN, USA
| | - Kelsey Yee
- Oak Ridge National Laboratory, BioEnergy Science Center Oak Ridge, TN, USA ; Biosciences Division, Oak Ridge National Laboratory Oak Ridge, TN, USA
| | - Dan Close
- Biosciences Division, Oak Ridge National Laboratory Oak Ridge, TN, USA
| | - Arthur Ragauskas
- Oak Ridge National Laboratory, BioEnergy Science Center Oak Ridge, TN, USA ; Department of Chemical and Biomolecular Engineering and Department of Forestry, Wildlife, and Fisheries, University of Tennessee Knoxville, TN, USA
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10
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Effect of Lignocellulose Related Compounds on Microalgae Growth and Product Biosynthesis: A Review. ENERGIES 2014. [DOI: 10.3390/en7074446] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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11
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Wahlström R, Rahikainen J, Kruus K, Suurnäkki A. Cellulose hydrolysis and binding with Trichoderma reesei Cel5A and Cel7A and their core domains in ionic liquid solutions. Biotechnol Bioeng 2013; 111:726-33. [PMID: 24258388 DOI: 10.1002/bit.25144] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 09/26/2013] [Accepted: 10/28/2013] [Indexed: 11/06/2022]
Abstract
Ionic liquids (ILs) dissolve lignocellulosic biomass and have a high potential as pretreatment prior to total enzymatic hydrolysis. ILs are, however, known to inactivate cellulases. In this article, enzymatic hydrolysis of microcrystalline cellulose (MCC) and enzyme binding onto the cellulosic substrate were studied in the presence of cellulose-dissolving ILs. Two different ILs, 1,3-dimethylimidazolium dimethylphosphate ([DMIM]DMP) and 1-ethyl-3-methylimidazolium acetate ([EMIM]AcO), and two monocomponent cellulases, Trichoderma reesei cellobiohydrolase Cel7A and endoglucanase Cel5A, were used in the study. The role and IL sensitivity of the carbohydrate-binding module (CBM) were studied by performing hydrolysis and binding experiments with both the intact cellulases, and their respective core domains (CDs). Based on hydrolysis yields and substrate binding experiments for the intact enzymes and their CDs in the presence of ILs, the function of the CBM appeared to be very IL sensitive. Binding data suggested that the CBM was more important for the substrate binding of endoglucanase Cel5A than for the binding of cellobiohydrolase Cel7A. The CD of Cel7A was able to bind well to cellulose even without a CBM, whereas Cel5A CD had very low binding affinity. Hydrolysis also occurred with Cel5A CD even if this protein had very low binding affinity in all the studied matrices. Binding and hydrolysis were less affected by the studied ILs for Cel7A than for Cel5A. To our knowledge, this is the first systematic study of IL effects on cellulase substrate binding.
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Affiliation(s)
- Ronny Wahlström
- VTT - Technical Research Centre of Finland, P.O. Box 1000, FI-02044 VTT, Espoo, Uusimaa, Finland.
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Gourlay K, Hu J, Arantes V, Andberg M, Saloheimo M, Penttilä M, Saddler J. Swollenin aids in the amorphogenesis step during the enzymatic hydrolysis of pretreated biomass. BIORESOURCE TECHNOLOGY 2013; 142:498-503. [PMID: 23759433 DOI: 10.1016/j.biortech.2013.05.053] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Revised: 05/10/2013] [Accepted: 05/15/2013] [Indexed: 05/22/2023]
Abstract
A key limitation in the overall hydrolysis process is the restricted access that the hydrolytic enzymes have due to the macro-and-micro structure of cellulose and its association with hemicellulose and lignin. Previous work has shown that several non-hydrolytic proteins can disrupt cellulose structure and boost the activity of hydrolytic enzymes when purer forms of cellulose are used. In the work reported here, Swollenin primarily disrupted the hemicellulosic fraction of pretreated corn stover, resulting in the solubilisation of monomeric and oligomeric sugars. Although Swollenin showed little synergism when combined with the cellulase monocomponents exoglucanase (CEL7A) and endoglucanase (CEL5A), it showed pronounced synergism with xylanase monocomponents Xylanase GH10 and Xylanase GH11, resulting in the release of significantly more xylose (>300%). It appears that Swollenin plays a role in amorphogenesis and that its primary action is enhancing access to the hemicellulose fraction that limits or masks accessibility to the cellulose component of lignocellulosic substrates.
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Affiliation(s)
- Keith Gourlay
- Forest Products Biotechnology/Bioenergy Group, Department of Wood Science, Faculty of Forestry, University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada V6T 1Z4
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13
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Wahlström R, Rovio S, Suurnäkki A. Analysis of mono- and oligosaccharides in ionic liquid containing matrices. Carbohydr Res 2013; 373:42-51. [DOI: 10.1016/j.carres.2012.11.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Revised: 11/02/2012] [Accepted: 11/12/2012] [Indexed: 11/24/2022]
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14
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Wahlström R, King A, Parviainen A, Kruus K, Suurnäkki A. Cellulose hydrolysis with thermo- and alkali-tolerant cellulases in cellulose-dissolving superbase ionic liquids. RSC Adv 2013. [DOI: 10.1039/c3ra42987c] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
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15
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Culbertson A, Jin M, da Costa Sousa L, Dale BE, Balan V. In-house cellulase production from AFEX™ pretreated corn stover using Trichoderma reesei RUT C-30. RSC Adv 2013. [DOI: 10.1039/c3ra44847a] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Shi J, Gao H, Xia Y, Li W, Wang H, Zheng C. Efficient process for the direct transformation of cellulose and carbohydrates to 5-(hydroxymenthyl)furfural with dual-core sulfonic acid ionic liquids and co-catalysts. RSC Adv 2013. [DOI: 10.1039/c3ra41062e] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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