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Maltari R, Kontro J, Koivu K, Farooq M, Mikkilä J, Zhang R, Hildén K, Sipilä J, Nousiainen PA. Fractionation of Technical Lignin from Enzymatically Treated Steam-Exploded Poplar Using Ethanol and Formic Acid. ACS APPLIED POLYMER MATERIALS 2022; 4:9388-9398. [PMID: 36532889 PMCID: PMC9748740 DOI: 10.1021/acsapm.2c01665] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 11/11/2022] [Indexed: 06/01/2023]
Abstract
Lignocellulosic biorefineries produce lignin-rich side streams with high valorization potential concealed behind their recalcitrant structure. Valorization of these residues to chemicals, materials, and fuels increases the profitability of biorefineries. Fractionation is required to reduce the lignins' structural heterogeneity for further processing. We fractionated the technical biorefinery lignin received after steam explosion and saccharification processes. More homogeneous lignin fractions were produced with high β-O-4' and aromatic content without residual carbohydrates. Non-toxic biodegradable organic solvents like ethanol and formic acid were used for fractionation and can be adapted to the existing biorefinery processes. Macromolecular properties of the isolated fractions were carefully characterized by structural, chemical, and thermal methods. The ethanol organosolv treatment produced highly soluble lignin with a reasonable yield, providing a uniform material for lignin applications. The organosolv fractionation with formic acid and combined ethanol-formic acid produced modified lignins that, based on thermal analysis, are promising as thermoresponsive materials.
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Affiliation(s)
- Riku Maltari
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
- Department
of Microbiology, University of Helsinki, P.O. Box 56, Viikinkaari 9, Helsinki FI-00014, Finland
| | - Jussi Kontro
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
| | - Klaus Koivu
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
| | - Muhammad Farooq
- Department
of Bioproducts and Biosystems, Aalto University, Vuorimiehentie 1, Espoo FI-02150, Finland
| | - Joona Mikkilä
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
- Department
of Microbiology, University of Helsinki, P.O. Box 56, Viikinkaari 9, Helsinki FI-00014, Finland
| | - Rui Zhang
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
| | - Kristiina Hildén
- Department
of Microbiology, University of Helsinki, P.O. Box 56, Viikinkaari 9, Helsinki FI-00014, Finland
| | - Jussi Sipilä
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
| | - Paula A. Nousiainen
- Department
of Chemistry, University of Helsinki, P.O. Box 55, A. I. Virtasen Aukio
1, Helsinki FI-00014, Finland
- Department
of Bioproducts and Biosystems, Aalto University, Vuorimiehentie 1, Espoo FI-02150, Finland
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2
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Munson CR, Gao Y, Mortimer JC, Murray DT. Solid-State Nuclear Magnetic Resonance as a Tool to Probe the Impact of Mechanical Preprocessing on the Structure and Arrangement of Plant Cell Wall Polymers. FRONTIERS IN PLANT SCIENCE 2022; 12:766506. [PMID: 35095947 PMCID: PMC8790750 DOI: 10.3389/fpls.2021.766506] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Accepted: 11/25/2021] [Indexed: 06/14/2023]
Abstract
Efficient separation of the plant cell wall polymers during lignocellulose processing has been historically challenging due to insolubility of the polymers and their propensity for recalcitrant reassembly. Methods, such as "lignin first" extraction techniques, have advanced efficient biomass use, but the molecular mechanisms for recalcitrance remain enigmatic. Here, we discuss how solid-state Nuclear Magnetic Resonance (NMR) approaches report on the 3D organization of cellulose, xylan, and lignin in the plant cell wall. Recent results illustrate that the organization of these polymers varies across biomass sources and sample preparation methods, with even minimal physical processing causing significant effects. These structural differences contribute to variable extraction efficiencies for bioproducts after downstream processing. We propose that solid-state NMR methods can be applied to follow biomass processing, providing an understanding of the polymer rearrangements that can lead to poor yields for the desired bioproducts. The utility of the technique is illustrated for mechanical processing using lab-scale vibratory ball milling of Sorghum bicolor.
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Affiliation(s)
- Coyla R. Munson
- Department of Chemistry, University of California, Davis, Davis, CA, United States
| | - Yu Gao
- Joint BioEnergy Institute, Emeryville, CA, United States
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - Jenny C. Mortimer
- Joint BioEnergy Institute, Emeryville, CA, United States
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
- School of Agriculture, Food and Wine, Waite Research Institute, University of Adelaide, Glen Osmond, SA, Australia
| | - Dylan T. Murray
- Department of Chemistry, University of California, Davis, Davis, CA, United States
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Kontro J, Lyra C, Koponen M, Kuuskeri J, Kähkönen MA, Wallenius J, Wan X, Sipilä J, Mäkelä MR, Nousiainen P, Hildén K. Production of Recombinant Laccase From Coprinopsis cinerea and Its Effect in Mediator Promoted Lignin Oxidation at Neutral pH. Front Bioeng Biotechnol 2021; 9:767139. [PMID: 34858962 PMCID: PMC8630700 DOI: 10.3389/fbioe.2021.767139] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 10/26/2021] [Indexed: 11/15/2022] Open
Abstract
Laccases are multi-copper oxidases that use molecular oxygen as the electron acceptor to oxidize phenolic and indirectly also non-phenolic substrates by mechanisms involving radicals. Due to their eco-friendliness and broad substrate specificity, laccases span a wide range of biotechnological applications. We have heterologously expressed a laccase from the coprophilic basidiomycete Coprinopsis cinerea (CcLcc9) in the methylotrophic yeast Pichia pastoris. The recombinant CcLcc9 (rCcLcc9) oxidized 2,6-dimethoxyphenol in the neutral pH range, and showed thermostability up to 70°C. The rCcLcc9 efficiently oxidized veratryl alcohol to veratraldehyde in the presence of low molecular weight mediators syringyl nitrile, methyl syringate and violuric acid, which are syringyl-type plant phenolics that have shown potential as natural co-oxidants for lignocellulosic materials. In addition, rCcLcc9 is able to depolymerize biorefinery hardwood lignin in the presence of methyl syringate and syringyl nitrile as indicated by gel permeation chromatography, and infrared spectral and nucleic magnetic resonance analyses. Furthermore, we showed that several added-value aromatic compounds, such as vanillin, vanillic acid, syringaldehyde, syringic acid and p-hydroxybenzoic acid, were formed during sequential biocatalytic chemical degradation of biorefinery lignin, indicating that rCcLcc9 harbors a great potential for sustainable processes of circular economy and modern biorefineries.
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Affiliation(s)
- Jussi Kontro
- Department of Chemistry, Faculty of Science, University of Helsinki, Helsinki, Finland
| | - Christina Lyra
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Milla Koponen
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Jaana Kuuskeri
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Mika A Kähkönen
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Janne Wallenius
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Xing Wan
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Jussi Sipilä
- Department of Chemistry, Faculty of Science, University of Helsinki, Helsinki, Finland
| | - Miia R Mäkelä
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Paula Nousiainen
- Department of Chemistry, Faculty of Science, University of Helsinki, Helsinki, Finland
| | - Kristiina Hildén
- Department of Microbiology, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
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Khongchamnan P, Wanmolee W, Laosiripojana N, Champreda V, Suriyachai N, Kreetachat T, Sakulthaew C, Chokejaroenrat C, Imman S. Solvothermal-Based Lignin Fractionation From Corn Stover: Process Optimization and Product Characteristics. Front Chem 2021; 9:697237. [PMID: 34422761 PMCID: PMC8374146 DOI: 10.3389/fchem.2021.697237] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 07/19/2021] [Indexed: 11/13/2022] Open
Abstract
Fractionation of lignocellulosic is a fundamental step in the production of value-added biobased products. This work proposes an initiative to efficiently extract lignin from the corn stover using a single-step solvothermal fractionation in the presence of an acid promoter (H2SO4). The organic solvent mixture used consists of ethyl acetate, ethanol, and water at a ratio of 30: 25:45 (v/v), respectively. H2SO4 was utilized as a promoter to improve the performance and selectivity of lignin removal from the solid phase and to increase the amount of recovered lignin in the organic phase. The optimal conditions for this extraction, based on response surface methodology (RSM), are a temperature of 180°C maintained for 49.1 min at an H2SO4 concentration of 0.08 M. The optimal conditions show an efficient reaction with 98.0% cellulose yield and 75.0% lignin removal corresponding to 72.9% lignin recovery. In addition, the extracted lignin fractions, chemical composition, and structural features were investigated using Fourier transform infrared spectroscopy, thermogravimetric analysis, elemental analysis, and two-dimensional heteronuclear single quantum coherence nuclear magnetic resonance spectroscopy (2D-HSQC NMR). The results indicate that the recovered lignin primarily contains a β-O-4 linking motif based on 2D-HSQC spectra. In addition, new C-C inter-unit linkages (i.e., β-β, and β-5) are not formed in the recovered lignin during H2SO4-catalyzed solvothermal pretreatment. This work facilitates effective valorization of lignin into value-added chemicals and fuels.
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Affiliation(s)
| | - Wanwitoo Wanmolee
- National Nanotechnology Center, National Science and Technology Development Agency, Thailand Science Park, Pathumthani, Thailand
| | - Navadol Laosiripojana
- The Joint Graduate School for Energy and Environment (JGSEE), King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
- BIOTEC–JGSEE Integrative Biorefinery Laboratory, National Center for Genetic Engineering and Biotechnology, Pathumthani, Thailand
| | - Verawat Champreda
- BIOTEC–JGSEE Integrative Biorefinery Laboratory, National Center for Genetic Engineering and Biotechnology, Pathumthani, Thailand
| | - Nopparat Suriyachai
- BIOTEC–JGSEE Integrative Biorefinery Laboratory, National Center for Genetic Engineering and Biotechnology, Pathumthani, Thailand
- Intregated Biorefinery Excellent Center (IBC), School of Energy and Environment, University of Phayao, Muang Phayao, Thailand
| | - Torpong Kreetachat
- School of Energy and Environment, University of Phayao, Muang Phayao, Thailand
- Intregated Biorefinery Excellent Center (IBC), School of Energy and Environment, University of Phayao, Muang Phayao, Thailand
| | - Chainarong Sakulthaew
- Department of Veterinary Technology, Faculty of Veterinary Technology, Kasetsart University, Bangkok, Thailand
| | - Chanat Chokejaroenrat
- Department of Environmental Technology and Management, Faculty of Environment, Kasetsart University, Bangkok, Thailand
| | - Saksit Imman
- School of Energy and Environment, University of Phayao, Muang Phayao, Thailand
- Intregated Biorefinery Excellent Center (IBC), School of Energy and Environment, University of Phayao, Muang Phayao, Thailand
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Pennacchio A, Pitocchi R, Varese GC, Giardina P, Piscitelli A. Trichoderma harzianum cerato-platanin enhances hydrolysis of lignocellulosic materials. Microb Biotechnol 2021; 14:1699-1706. [PMID: 34107174 PMCID: PMC8313248 DOI: 10.1111/1751-7915.13836] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 04/03/2021] [Accepted: 05/10/2021] [Indexed: 11/29/2022] Open
Abstract
Considering its worldwide abundance, cellulose can be a suitable candidate to replace the fossil oil-based materials, even if its potential is still untapped, due to some scientific and technical gaps. This work offers new possibilities demonstrating for the first time the ability of a cerato-platanin, a small fungal protein, to valorize lignocellulosic Agri-food Wastes. Indeed, cerato-platanins can loosen cellulose rendering it more accessible to hydrolytic attack. The cerato-platanin ThCP from a marine strain of Trichoderma harzianum, characterized as an efficient biosurfactant protein, has proven able to efficiently pre-treat apple pomace, obtaining a sugar conversion yield of 65%. Moreover, when used in combination with a laccase enzyme, a notable increase in the sugar conversion yield was measured. Similar results were also obtained when other wastes, coffee silverskin and potato peel, were pre-treated. With respect to the widespread laccase pre-treatments, this new pre-treatment approach minimizes process time, increasing energy efficiency.
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Affiliation(s)
- Anna Pennacchio
- Department of Chemical SciencesUniversity of Naples Federico IIVia Cintia 4Naples80126Italy
| | - Rossana Pitocchi
- Department of Chemical SciencesUniversity of Naples Federico IIVia Cintia 4Naples80126Italy
| | - Giovanna Cristina Varese
- Department of Life Sciences and Systems BiologyUniversity of Turinviale P.A. Mattioli 25Turin10125Italy
| | - Paola Giardina
- Department of Chemical SciencesUniversity of Naples Federico IIVia Cintia 4Naples80126Italy
| | - Alessandra Piscitelli
- Department of Chemical SciencesUniversity of Naples Federico IIVia Cintia 4Naples80126Italy
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6
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Kontro J, Maltari R, Mikkilä J, Kähkönen M, Mäkelä MR, Hildén K, Nousiainen P, Sipilä J. Applicability of Recombinant Laccases From the White-Rot Fungus Obba rivulosa for Mediator-Promoted Oxidation of Biorefinery Lignin at Low pH. Front Bioeng Biotechnol 2020; 8:604497. [PMID: 33392170 PMCID: PMC7773891 DOI: 10.3389/fbioe.2020.604497] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 11/11/2020] [Indexed: 11/18/2022] Open
Abstract
Utilization of lignin-rich side streams has been a focus of intensive studies recently. Combining biocatalytic methods with chemical treatments is a promising approach for sustainable modification of lignocellulosic waste streams. Laccases are catalysts in lignin biodegradation with proven applicability in industrial scale. Laccases directly oxidize lignin phenolic components, and their functional range can be expanded using low-molecular-weight compounds as mediators to include non-phenolic lignin structures. In this work, we studied in detail recombinant laccases from the selectively lignin-degrading white-rot fungus Obba rivulosa for their properties and evaluated their potential as industrial biocatalysts for the modification of wood lignin and lignin-like compounds. We screened and optimized various laccase mediator systems (LMSs) using lignin model compounds and applied the optimized reaction conditions to biorefinery-sourced technical lignin. In the presence of both N-OH-type and phenolic mediators, the O. rivulosa laccases were shown to selectively oxidize lignin in acidic reaction conditions, where a cosolvent is needed to enhance lignin solubility. In comparison to catalytic iron(III)-(2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) oxidation systems, the syringyl-type lignin units were preferred in mediated biocatalytic oxidation systems.
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Affiliation(s)
- Jussi Kontro
- Department of Chemistry, Faculty of Science, Chemicum, University of Helsinki, Helsinki, Finland
| | - Riku Maltari
- Department of Chemistry, Faculty of Science, Chemicum, University of Helsinki, Helsinki, Finland
- Department of Microbiology, Faculty of Agriculture and Forestry, Viikki Biocenter 1, University of Helsinki, Helsinki, Finland
| | - Joona Mikkilä
- Department of Chemistry, Faculty of Science, Chemicum, University of Helsinki, Helsinki, Finland
- Department of Microbiology, Faculty of Agriculture and Forestry, Viikki Biocenter 1, University of Helsinki, Helsinki, Finland
| | - Mika Kähkönen
- Department of Microbiology, Faculty of Agriculture and Forestry, Viikki Biocenter 1, University of Helsinki, Helsinki, Finland
| | - Miia R. Mäkelä
- Department of Microbiology, Faculty of Agriculture and Forestry, Viikki Biocenter 1, University of Helsinki, Helsinki, Finland
| | - Kristiina Hildén
- Department of Microbiology, Faculty of Agriculture and Forestry, Viikki Biocenter 1, University of Helsinki, Helsinki, Finland
| | - Paula Nousiainen
- Department of Chemistry, Faculty of Science, Chemicum, University of Helsinki, Helsinki, Finland
| | - Jussi Sipilä
- Department of Chemistry, Faculty of Science, Chemicum, University of Helsinki, Helsinki, Finland
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