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C-O Bond Hydrogenolysis of Aqueous Mixtures of Sugar Polyols and Sugars over ReOx-Rh/ZrO2 Catalyst: Application to an Hemicelluloses Extracted Liquor. Catalysts 2019. [DOI: 10.3390/catal9090740] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The recovery and upgrade of hemicelluloses, a family of heteropolysaccharides in wood, is a key step to making lignocellulosic biomass conversion a cost-effective sustainable process in biorefinery. The comparative selective catalytic C-O bond hydrogenolysis of C5-C6 polyols, sugars, and their mixtures for the production of valuable C6 and C5 deoxygenated products was studied at 200 °C under 80 bar H2 over ReOx-Rh/ZrO2 catalysts. The sugars were rapidly converted to the polyols or converted into their hydrogenolysis products. Regardless of the reactants, C-O bond cleavage occurred significantly via multiple consecutive deoxygenation steps and led to the formation of linear deoxygenated C6 or C5 polyols. The distribution of products depended on the nature of the substrate and C-C bond scission was more important from monosaccharides. In addition, we demonstrated effective hydrogenolysis of a hemicellulose-extracted liquor from delignified maritime pine containing monosaccharides and low MW oligomers. Compared with the sugar-derived polyols, the mono- and oligosaccharides in the liquor were more rapidly converted to hexanediols or pentanediols. C-O bond scission was significant, giving a yield of desired deoxygenated products as high as 65%, higher than in the reaction of the synthetic mixture of glucose/xylose of the same C6/C5 sugar ratio (yield of 30%).
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Hijosa-Valsero M, Paniagua-García AI, Díez-Antolínez R. Industrial potato peel as a feedstock for biobutanol production. N Biotechnol 2018; 46:54-60. [PMID: 30044962 DOI: 10.1016/j.nbt.2018.07.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Revised: 06/28/2018] [Accepted: 07/21/2018] [Indexed: 01/01/2023]
Abstract
Potato peel from a snack factory was assessed as possible feedstock for biobutanol production. This lignocellulosic biomass was subjected to various physicochemical pretreatments (autohydrolysis and hydrolysis with dilute acids, alkalis, organic solvents or surfactants) under different conditions of time, temperature and reagent concentrations, in order to favour the release of sugars and reduce the generation of fermentation inhibitors. Thereafter, the pretreated potato peel was treated enzymatically to complete the hydrolysis. Autohydrolysis at 140 °C and 56 min was the most effective pretreatment, releasing 37.9 ± 2.99 g/L sugars from an aqueous mixture containing 10% (w/w) potato peel (sugar recovery efficiency 55 ± 13%). The fermentability of the hydrolysates was checked with six strains of Clostridium beijerinckii, C. acetobutylicum, C. saccharobutylicum and C. saccaroperbutylacetonicum. C. saccharobutylicum DSM 13864 produced 2.1 g/L acetone, 7.6 g/L butanol and 0.6 g/L ethanol in 96 h (0.186 gB/gS), whereas C. saccharoperbutylacetonicum DSM 2152 generated 1.8 g/L acetone, 8.1 g/L butanol and 1.0 g/L ethanol in 120 h (0.203 gB/gS). Detoxification steps of the hydrolysate before fermentation were not necessary. Potato peel may be an interesting feedstock for biorefineries focused on butanol production.
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Affiliation(s)
- María Hijosa-Valsero
- Biofuels and Bioproducts Research Centre, Institute of Agricultural Technology of Castile and Leon (ITACyL), Villarejo de Órbigo, E-24358 León, Spain.
| | - Ana I Paniagua-García
- Biofuels and Bioproducts Research Centre, Institute of Agricultural Technology of Castile and Leon (ITACyL), Villarejo de Órbigo, E-24358 León, Spain; Chemical and Environmental Bioprocess Engineering, Institute of Natural Resources (IRENA), University of Leon, Avenida de Portugal 42, E-24071 León, Spain.
| | - Rebeca Díez-Antolínez
- Biofuels and Bioproducts Research Centre, Institute of Agricultural Technology of Castile and Leon (ITACyL), Villarejo de Órbigo, E-24358 León, Spain; Chemical and Environmental Bioprocess Engineering, Institute of Natural Resources (IRENA), University of Leon, Avenida de Portugal 42, E-24071 León, Spain.
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3
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Wang C, Zhang S, Wu S, Cao Z, Zhang Y, Li H, Jiang F, Lyu J. Study on an alternative approach for the preparation of wood vinegar from the hydrothermolysis process of cotton stalk. BIORESOURCE TECHNOLOGY 2018; 254:231-238. [PMID: 29413928 DOI: 10.1016/j.biortech.2018.01.088] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2017] [Revised: 01/18/2018] [Accepted: 01/19/2018] [Indexed: 05/09/2023]
Abstract
The yield and pH of the refined aqueous product (RAP) prepared by the hydrothermolysis of cotton stalk (CS) were investigated using response surface methodology with the variation of three parameters: CS/water ratio of 0.05-0.15w/w, temperature of 180-280 °C, and retention time of 0-30 min. At the best formulation (0.05w/w, 264.36 °C and 0 min), the yield and pH of RAP were 82.8% and 3.95, respectively. Additionally, the organic compounds contained in RAP prepared under the respective optimal formulation (pH: 0.05w/w, 251.43 °C and 0 min, yield: 0.05w/w, 280.00 °C and 0 min) were determined by gas chromatography and mass spectrometry. The results show that the kinds of compounds in RAP are identical or similar to those in the wood vinegar (WV), but their contents is slightly higher than that of the WV. In sum, it is feasible that RAP has the enormous potential to be utilized as WV probably because of its higher quality and value than WV.
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Affiliation(s)
- Caiwei Wang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Shouyu Zhang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, PR China.
| | - Shunyan Wu
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Zhongyao Cao
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Yifan Zhang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Hao Li
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Fenghao Jiang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Junfu Lyu
- Department of Thermal Engineering, Tsinghua University, Beijing 100084, PR China
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Dietrich K, Dumont MJ, Schwinghamer T, Orsat V, Del Rio LF. Model Study To Assess Softwood Hemicellulose Hydrolysates as the Carbon Source for PHB Production in Paraburkholderia sacchari IPT 101. Biomacromolecules 2017; 19:188-200. [DOI: 10.1021/acs.biomac.7b01446] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Karolin Dietrich
- Bioresource
Engineering Department, McGill University, 21111 Lakeshore Road, Ste-Anne de Bellevue, Quebec Canada, H9X 3 V9
| | - Marie-Josée Dumont
- Bioresource
Engineering Department, McGill University, 21111 Lakeshore Road, Ste-Anne de Bellevue, Quebec Canada, H9X 3 V9
| | - Timothy Schwinghamer
- Department
of Plant Science, McGill University, 21111 Lakeshore Rd., Ste-Anne de Bellevue, Quebec Canada, H9X 3 V9
| | - Valérie Orsat
- Bioresource
Engineering Department, McGill University, 21111 Lakeshore Road, Ste-Anne de Bellevue, Quebec Canada, H9X 3 V9
| | - Luis F. Del Rio
- FPInnovations, 570 Saint-Jean Boulevard, Pointe-Claire, Quebec Canada H9R 3J9
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Sporck D, Reinoso FAM, Rencoret J, Gutiérrez A, del Rio JC, Ferraz A, Milagres AMF. Xylan extraction from pretreated sugarcane bagasse using alkaline and enzymatic approaches. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:296. [PMID: 29234463 PMCID: PMC5719793 DOI: 10.1186/s13068-017-0981-z] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 11/26/2017] [Indexed: 05/10/2023]
Abstract
BACKGROUND New biorefinery concepts are necessary to drive industrial use of lignocellulose biomass components. Xylan recovery before enzymatic hydrolysis of the glucan component is a way to add value to the hemicellulose fraction, which can be used in papermaking, pharmaceutical, and food industries. Hemicellulose removal can also facilitate subsequent cellulolytic glucan hydrolysis. RESULTS Sugarcane bagasse was pretreated with an alkaline-sulfite chemithermomechanical process to facilitate subsequent extraction of xylan by enzymatic or alkaline procedures. Alkaline extraction methods yielded 53% (w/w) xylan recovery. The enzymatic approach provided a limited yield of 22% (w/w) but produced the xylan with the lowest contamination with lignin and glucan components. All extracted xylans presented arabinosyl side groups and absence of acetylation. 2D-NMR data suggested the presence of O-methyl-glucuronic acid and p-coumarates only in enzymatically extracted xylan. Xylans isolated using the enzymatic approach resulted in products with molecular weights (Mw) lower than 6 kDa. Higher Mw values were detected in the alkali-isolated xylans. Alkaline extraction of xylan provided a glucan-enriched solid readily hydrolysable with low cellulase loads, generating hydrolysates with a high glucose/xylose ratio. CONCLUSIONS Hemicellulose removal before enzymatic hydrolysis of the cellulosic fraction proved to be an efficient manner to add value to sugarcane bagasse biorefining. Xylans with varied yield, purity, and structure can be obtained according to the extraction method. Enzymatic extraction procedures produce high-purity xylans at low yield, whereas alkaline extraction methods provided higher xylan yields with more lignin and glucan contamination. When xylan extraction is performed with alkaline methods, the residual glucan-enriched solid seems suitable for glucose production employing low cellulase loadings.
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Affiliation(s)
- Daniele Sporck
- Departamento de Biotecnologia, Escola de Engenharia de Lorena, Universidade de São Paulo, Lorena, SP 12602-810 Brazil
| | - Felipe A. M. Reinoso
- Departamento de Biotecnologia, Escola de Engenharia de Lorena, Universidade de São Paulo, Lorena, SP 12602-810 Brazil
| | - Jorge Rencoret
- Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, Av. Reina Mercedes, 10, 41012 Seville, Spain
| | - Ana Gutiérrez
- Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, Av. Reina Mercedes, 10, 41012 Seville, Spain
| | - José C. del Rio
- Instituto de Recursos Naturales y Agrobiología de Sevilla, CSIC, Av. Reina Mercedes, 10, 41012 Seville, Spain
| | - André Ferraz
- Departamento de Biotecnologia, Escola de Engenharia de Lorena, Universidade de São Paulo, Lorena, SP 12602-810 Brazil
| | - Adriane M. F. Milagres
- Departamento de Biotecnologia, Escola de Engenharia de Lorena, Universidade de São Paulo, Lorena, SP 12602-810 Brazil
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Biobutanol production from apple pomace: the importance of pretreatment methods on the fermentability of lignocellulosic agro-food wastes. Appl Microbiol Biotechnol 2017; 101:8041-8052. [DOI: 10.1007/s00253-017-8522-z] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 08/24/2017] [Accepted: 09/07/2017] [Indexed: 01/14/2023]
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Hydrothermal degradation of hemicelluloses from triploid poplar in hot compressed water at 180–340 °C. Polym Degrad Stab 2016. [DOI: 10.1016/j.polymdegradstab.2016.02.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Fritz C, Ferrer A, Salas C, Jameel H, Rojas OJ. Interactions between Cellulolytic Enzymes with Native, Autohydrolysis, and Technical Lignins and the Effect of a Polysorbate Amphiphile in Reducing Nonproductive Binding. Biomacromolecules 2015; 16:3878-88. [DOI: 10.1021/acs.biomac.5b01203] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Consuelo Fritz
- Department
of Forest Biomaterials, North Carolina State University, Raleigh, North Carolina 27695-8005, United States
| | - Ana Ferrer
- Department
of Forest Biomaterials, North Carolina State University, Raleigh, North Carolina 27695-8005, United States
| | - Carlos Salas
- Department
of Forest Biomaterials, North Carolina State University, Raleigh, North Carolina 27695-8005, United States
| | - Hasan Jameel
- Department
of Forest Biomaterials, North Carolina State University, Raleigh, North Carolina 27695-8005, United States
| | - Orlando J. Rojas
- Department
of Forest Biomaterials, North Carolina State University, Raleigh, North Carolina 27695-8005, United States
- Bio-Based
Colloids and Materials, Department of Forest Products Technology and
Centre of Excellence on “Molecular Engineering of Biosynthetic
Hybrid Materials” (HYBER), Aalto University, FIN-00076 Aalto, Espoo, Finland
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9
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Yedro FM, Cantero DA, Pascual M, García-Serna J, Cocero MJ. Hydrothermal fractionation of woody biomass: Lignin effect on sugars recovery. BIORESOURCE TECHNOLOGY 2015; 191:124-132. [PMID: 25985415 DOI: 10.1016/j.biortech.2015.05.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 05/01/2015] [Accepted: 05/02/2015] [Indexed: 06/04/2023]
Abstract
Subcritical water was employed to fractionate woody biomass into carbohydrates and lignin. Nine urban trees species (hardwood and softwood) from Spain were studied. The experiments were carried out in a semi-continuous reactor at 250 °C for 64 min. The hemicellulose and cellulose recovery yields were between 30%wt. and 80%wt. while the lignin content in the solid product ranged between 32%wt. and 92%wt. It was observed that an increment of solubilized lignin disfavored the hydrolysis of hemicelluloses. It was determined that the maximum extraction of hemicellulose was achieved at 20 min of solid reaction time while the extraction of celluloses not exhibited a maximum value. The hydrolysis of hemicellulose and cellulose would be governed by the hydrolysis kinetic and the polymers accessibility. In addition, the extraction of hemicellulose was negatively affected by the lignin content in the raw material while cellulose hydrolysis was not affected by this parameter.
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Affiliation(s)
- Florencia M Yedro
- High Pressure Processes Group, Department of Chemical Engineering and Environmental Technology, EII Sede Mergelina, University of Valladolid, 47011 Valladolid, Spain
| | - Danilo A Cantero
- High Pressure Processes Group, Department of Chemical Engineering and Environmental Technology, EII Sede Mergelina, University of Valladolid, 47011 Valladolid, Spain
| | - Marcos Pascual
- High Pressure Processes Group, Department of Chemical Engineering and Environmental Technology, EII Sede Mergelina, University of Valladolid, 47011 Valladolid, Spain
| | - Juan García-Serna
- High Pressure Processes Group, Department of Chemical Engineering and Environmental Technology, EII Sede Mergelina, University of Valladolid, 47011 Valladolid, Spain.
| | - M José Cocero
- High Pressure Processes Group, Department of Chemical Engineering and Environmental Technology, EII Sede Mergelina, University of Valladolid, 47011 Valladolid, Spain
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Li H, Ren J, Zhong L, Sun R, Liang L. Production of furfural from xylose, water-insoluble hemicelluloses and water-soluble fraction of corncob via a tin-loaded montmorillonite solid acid catalyst. BIORESOURCE TECHNOLOGY 2015; 176:242-8. [PMID: 25461009 DOI: 10.1016/j.biortech.2014.11.044] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 11/08/2014] [Accepted: 11/10/2014] [Indexed: 05/06/2023]
Abstract
The conversion of xylose, water-insoluble hemicelluloses (WIH) and water-soluble fraction (WSF) of corncob to furfural was performed using montmorillonite with tin ions (Sn-MMT) containing double acid sites as a solid acid catalyst. The co-existence of Lewis acids and Brønsted acids in Sn-MMT was shown to improve the furfural yield and selectivity. 76.79% furfural yield and 82.45% furfural selectivity were obtained from xylose using Sn-MMT as a catalyst in a biphasic system with 2-s-butylphenol (SBP) as the organic extracting layer and dimethyl sulfoxide (DMSO) as the co-solvent in contact with an aqueous phase saturated with NaCl (SBP/NaCl-DMSO) at 180°C for 30min. Furthermore, Sn-MMT also demonstrated the excellent catalytic performance in the conversion of pentose-rich materials of corncob and 39.56% and 54.15% furfural yields can be directly obtained from WIH and WSF in the SBP/NaCl-DMSO system, respectively.
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Affiliation(s)
- Huiling Li
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
| | - Junli Ren
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Linjie Zhong
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
| | - Runcang Sun
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
| | - Lei Liang
- Biomaterials Research Center, Guangzhou Sugarcane Industry Research Institute, Guangzhou 510316, China
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11
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Wang Q, Jahan MS, Liu S, Miao Q, Ni Y. Lignin removal enhancement from prehydrolysis liquor of kraft-based dissolving pulp production by laccase-induced polymerization. BIORESOURCE TECHNOLOGY 2014; 164:380-5. [PMID: 24865327 DOI: 10.1016/j.biortech.2014.05.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 04/30/2014] [Accepted: 05/02/2014] [Indexed: 05/16/2023]
Abstract
Lignin removal is essential for value-added utilization of hemicelluloses and acetic acid present in the prehydrolysis liquor (PHL) of a kraft-based hardwood dissolving pulp production. In this paper, a novel process concept, consisting of laccase-induced lignin polymerization, followed by filtration/flocculation, was developed to enhance the lignin removal. The results showed that the lignin removal increased from 11% to 46-61% at laccase concentration of 1-4 U mL(-1). The GPC results showed that the molecular weight of the lignin from the laccase treated PHL was increased by 160% in comparison with the original one. The subsequent flocculation using singular Poly-DADMAC system or dual polymer system of Poly-DADMAC/CPAM can further remove 10-15% lignin. The concentrations of hemicelluloses and acetic acid were negligibly affected during the laccase treatment, while flocculation caused 12-15% of total sugar loss. Additionally, the process incorporates this new concept into the kraft-based dissolving pulp production process was proposed.
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Affiliation(s)
- Qiang Wang
- Key Laboratory of Pulp & Paper Science and Technology (Qilu University of Technology), Ministry of Education, Jinan, Shandong 250353, PR China; Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada.
| | - M Sarwar Jahan
- Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada; Pulp and Paper Research Division, BCSIR Laboratories, Dhaka, Dr. Qudrat-i-Khuda Road, Dhaka 1205, Bangladesh
| | - Shanshan Liu
- Key Laboratory of Pulp & Paper Science and Technology (Qilu University of Technology), Ministry of Education, Jinan, Shandong 250353, PR China; Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada
| | - Qingxian Miao
- Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada; College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Yonghao Ni
- Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada
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Rissanen JV, Grénman H, Willför S, Murzin DY, Salmi T. Spruce Hemicellulose for Chemicals Using Aqueous Extraction: Kinetics, Mass Transfer, and Modeling. Ind Eng Chem Res 2014. [DOI: 10.1021/ie500234t] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jussi V. Rissanen
- Laboratory
of Industrial Chemistry and Reaction Engineering, Process Chemistry
Centre, Department of Chemical Engineering, Åbo Akademi University, Biskopsgatan 8, FI-20500 Åbo/Turku, Finland
| | - Henrik Grénman
- Laboratory
of Industrial Chemistry and Reaction Engineering, Process Chemistry
Centre, Department of Chemical Engineering, Åbo Akademi University, Biskopsgatan 8, FI-20500 Åbo/Turku, Finland
| | - Stefan Willför
- Laboratory
of Wood and Paper Chemistry, Process Chemistry Centre, Åbo Akademi University, Porthansgatan 3, FI-20500 Åbo/Turku, Finland
| | - Dmitry Yu. Murzin
- Laboratory
of Industrial Chemistry and Reaction Engineering, Process Chemistry
Centre, Department of Chemical Engineering, Åbo Akademi University, Biskopsgatan 8, FI-20500 Åbo/Turku, Finland
| | - Tapio Salmi
- Laboratory
of Industrial Chemistry and Reaction Engineering, Process Chemistry
Centre, Department of Chemical Engineering, Åbo Akademi University, Biskopsgatan 8, FI-20500 Åbo/Turku, Finland
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Wu S, Hu J, Wei L, Du Y, Shi X, Zhang L. Antioxidant and antimicrobial activity of Maillard reaction products from xylan with chitosan/chitooligomer/glucosamine hydrochloride/taurine model systems. Food Chem 2014; 148:196-203. [DOI: 10.1016/j.foodchem.2013.10.044] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 10/05/2013] [Accepted: 10/08/2013] [Indexed: 10/26/2022]
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14
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Li M, Tu M, Cao D, Bass P, Adhikari S. Distinct roles of residual xylan and lignin in limiting enzymatic hydrolysis of organosolv pretreated loblolly pine and sweetgum. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:646-54. [PMID: 23270516 DOI: 10.1021/jf304517w] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The interactions between xylan/lignin and cellulase enzymes play a key role in the effective hydrolysis of lignocellulosic biomass. Organosolv pretreated loblolly pine (OPLP) and sweetgum (OPSG) were used to quantitatively elucidate the distinct roles of residual xylan and lignin on enzymatic hydrolysis, based on the initial hydrolysis rates and the final hydrolysis yields. The initial hydrolysis rates of OPLP and OPSG were 1.45 (glucose) and 1.19 g/L/h (glucose), respectively, under the enzyme loading of 20 FPU/g glucan. The final glucan hydrolysis yields of OPLP and OPSG at 72 h were 76.4 and 98.9%, respectively. By correlating the amount of residual lignin and xylan to the initial hydrolysis rate and the final hydrolysis yield in OPLP and OPSG, a more accurate fundamental understanding of the roles of xylan and lignin in limiting the enzymatic hydrolysis has been developed. The higher amount of residual xylan (9.7%) in OPSG resulted in lower initial hydrolysis rate (1.19 g/L/h). The higher amount of residual lignin in OPLP (18.6%) resulted in lower final hydrolysis yield of glucan (76.4%). In addition, we observed in the simultaneous saccharification and fermentation (SSF) that ethyl xyloside was produced by the enzymatic catalysis of xylose/xylan and ethanol.
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Affiliation(s)
- Mi Li
- Forest Products Laboratory and Center for Bioenergy and Bioproducts, Auburn University, Auburn, Alabama 36849, United States
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15
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Extrusion Pretreatment of Pine Wood Chips. Appl Biochem Biotechnol 2012; 167:81-99. [DOI: 10.1007/s12010-012-9662-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Accepted: 03/28/2012] [Indexed: 10/28/2022]
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