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Fall I, Doumèche B, Abdellaoui S, Rémond C, Rakotoarivonina H, Ochs M. Paper-based electrodes as a tool for detecting ligninolytic enzymatic activities. Bioelectrochemistry 2024; 156:108609. [PMID: 37995505 DOI: 10.1016/j.bioelechem.2023.108609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 11/15/2023] [Accepted: 11/15/2023] [Indexed: 11/25/2023]
Abstract
Lignin is the most important natural source of aromatic compounds. The valorisation of lignin into aromatics requires fractionation steps that can be catalysed by ligninolytic enzymes. However, one of the main limitations of biological lignin fractionation is the low efficiency of biocatalysts; it is therefore crucial to enhance or to identify new ligninolytic enzymes. Currently, the screening of ligninolytic activities on lignin polymers represents a technological bottenleck and hinders the characterization and the discovery of efficient ligninolytic biocatalysts. An efficient and fast method for the measurement of such enzymatic activities is therefore required. In this work, we present a new electrochemical tool based on lignin-coated paper electrodes for the detection and the characterization of ligninolytic activity. The suitability of this method is demonstrated using a catalase-peroxidase isolated from Thermobacillus xylanilyticus.
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Affiliation(s)
- Issa Fall
- Université de Reims Champagne-Ardenne, INRAE, FARE, UMR A 614, AFERE, Reims, France
| | - Bastien Doumèche
- Université Lyon, Université Claude Bernard Lyon 1, CNRS, INSA, CPE-Lyon, UMR 5246, ICBMS (Institut de Chimie et Biochimie Moléculaires et Supramoléculaires), F-69622, Villeurbanne, France
| | - Sofiene Abdellaoui
- Université de Reims Champagne-Ardenne, INRAE, FARE, UMR A 614, AFERE, Reims, France
| | - Caroline Rémond
- Université de Reims Champagne-Ardenne, INRAE, FARE, UMR A 614, AFERE, Reims, France
| | | | - Marjorie Ochs
- Université Lyon, Université Claude Bernard Lyon 1, CNRS, INSA, CPE-Lyon, UMR 5246, ICBMS (Institut de Chimie et Biochimie Moléculaires et Supramoléculaires), F-69622, Villeurbanne, France.
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Li P, Zhou H, Tao Y, Ren J, Wu C, Wu W. Recent Development and Perspectives of Solvents and Electrode Materials for Electrochemical Oxidative Degradation of Lignin. ELECTROANAL 2022. [DOI: 10.1002/elan.202200100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Du Y, Ma H, Huang L, Pan Y, Huang J, Liu Y. Electrochemical characteristics of the decolorization of three dyes by laccase mediator system (LMS) with synthetic and natural mediators. CHEMOSPHERE 2020; 239:124779. [PMID: 31521934 DOI: 10.1016/j.chemosphere.2019.124779] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Revised: 09/02/2019] [Accepted: 09/04/2019] [Indexed: 06/10/2023]
Abstract
Laccase mediator system (LMS), a very attractive candidate for refractory organics biodegradation, harbors tremendous potential on industry application. However, the performance of LMS usually varies with the discrepancy of mediators and substrates in their chemical structures. Here, we adopt electrochemical analysis that is able to assess the degradation performance of various LMS on three different dyes by quantitative analysis of reaction outcome. Two mechanisms were suggested to explain the grafting of three mediators (1-Hydroxybenzotriazole, Violuric Acid and Acetosyringone), involving the transformation of proton or electron to produce active moieties, which subsequently react with target substrates. A thorough electrochemical insight into the redox features of mediators and its change in the presence of laccase and substrates were carried out using electrochemical analysis. The effectiveness of each kind of LMS on substrates was preliminarily evaluated by analyzing the change of the peak current and potential of mediators. The actual conversion rate of dyes was used to verify the analysis results, which confirms the important role of the stability of the oxidized form as well as their redox potential of the mediators in determining the mechanism of substrate oxidation. The application of electrochemical analysis in efficiency evaluation of LMS shed new light on effective selection of suitable mediators for degradation of refractory organics. It was therefore possible to prejudge the efficacy of LMS by analyzing the electrochemical parameters of target substances and mediators, which undoubtedly has broad further application prospects of LMS.
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Affiliation(s)
- Yiwen Du
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, China; Department of Environmental Engineering, Chongqing University, Chongqing, China
| | - Hua Ma
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, China; Department of Environmental Engineering, Chongqing University, Chongqing, China.
| | - Liping Huang
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, China; Department of Environmental Engineering, Chongqing University, Chongqing, China
| | - Yu Pan
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, China; Department of Environmental Engineering, Chongqing University, Chongqing, China
| | - Juan Huang
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, China; Department of Environmental Engineering, Chongqing University, Chongqing, China
| | - Yan Liu
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, China; Department of Environmental Engineering, Chongqing University, Chongqing, China
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Graphene enhanced transformation of lignin in laccase-ABTS system by accelerating electron transfer. Enzyme Microb Technol 2018; 119:17-23. [DOI: 10.1016/j.enzmictec.2018.08.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 07/25/2018] [Accepted: 08/17/2018] [Indexed: 02/03/2023]
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Keaveney ST, Harper JB, Croft AK. Ion-Reagent Interactions Contributing to Ionic Liquid Solvent Effects on a Condensation Reaction. Chemphyschem 2018; 19:3279-3287. [PMID: 30289579 DOI: 10.1002/cphc.201800695] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Indexed: 11/09/2022]
Abstract
Molecular dynamics simulations of solutions of hexan-1-amine or 4-methoxybenzaldehyde in acetonitrile, an ionic liquid/acetonitrile mixture (χIL =0.2), and a number of different (neat) ionic liquids were performed, to further understand the solvent effects on the condensation reaction of these species. This work indicates that, in the presence of an ionic liquid, the amine group of hexan-1-amine is exclusively solvated by the components of the ionic liquid, and not by acetonitrile, and that the anion interacts with the aldehyde group of 4-methoxybenzaldehyde. These interactions showed little dependence on the proportion of the ionic liquid present. When varying the cation of the ionic liquid there were changes in the cation-amine interaction, and 1-butyl-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl)imide ([Bm2 im][N(CF3 SO2 )2 ]) was found to order more than expected about the amine. This ordering is likely the origin of the large rate constant values determined in [Bm2 im][N(CF3 SO2 )2 ] for this condensation reaction and explains an anomaly seen previously. When changing the anion, changes were seen in the interactions between both the cation and anion with hexan-1-amine, and the anion with 4-methoxybenzaldehyde. The differing magnitude of these interactions likely causes subtle changes in the activation parameters for this condensation reaction, and provides an explanation for the anomalous rate constant values previously determined when varying the anion.
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Affiliation(s)
- Sinead T Keaveney
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
- Department of Molecular Sciences, Macquarie University, North Ryde, NSW 2109, Australia
| | - Jason B Harper
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | - Anna K Croft
- Department of Chemical and Environmental Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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Sun J, Liu H, Yang W, Chen S, Fu S. Molecular Mechanisms Underlying Inhibitory Binding of Alkylimidazolium Ionic Liquids to Laccase. Molecules 2017; 22:E1353. [PMID: 28809813 PMCID: PMC6152407 DOI: 10.3390/molecules22081353] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 08/06/2017] [Accepted: 08/10/2017] [Indexed: 11/16/2022] Open
Abstract
Water-miscible alkylimidazolium ionic liquids (ILs) are "green" co-solvents for laccase catalysis, but generally inhibit enzyme activity. Here, we present novel insights into inhibition mechanisms by a combination of enzyme kinetics analysis and molecular simulation. Alkylimidazolium cations competitively bound to the TI Cu active pocket in the laccase through hydrophobic interactions. Cations with shorter alkyl chains (C₂~C₆) entered the channel inside the pocket, exhibiting a high compatibility with laccase (competitive inhibition constant Kic = 3.36~3.83 mM). Under the same conditions, [Omim]Cl (Kic = 2.15 mM) and [Dmim]Cl (Kic = 0.18 mM) with longer alkyl chains bound with Leu296 or Leu297 near the pocket edge and Leu429 around TI Cu, which resulted in stronger inhibition. Complexation with alkylimidazolium cations shifted the pH optima of laccase to the right by 0.5 unit, and might, thereby, lead to invalidation of the Hofmeister series of anions. EtSO₄- showed higher biocompatibility than did Ac- or Cl-, probably due to its binding near the TI Cu and its hindering the entry of alkylimidazolium cations. In addition, all tested ILs accelerated the scavenging of 2, 2'-azino-bis-(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radicals, which, however, did not play a determining role in the inhibition of laccase.
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Affiliation(s)
- Jianliang Sun
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China.
| | - Hao Liu
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China.
| | - Wenping Yang
- School of Mathematics, South China University of Technology, Guangzhou 510640, Guangdong, China.
| | - Shicheng Chen
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI 48824, USA.
| | - Shiyu Fu
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China.
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Dier TKF, Rauber D, Durneata D, Hempelmann R, Volmer DA. Sustainable Electrochemical Depolymerization of Lignin in Reusable Ionic Liquids. Sci Rep 2017; 7:5041. [PMID: 28698638 PMCID: PMC5505966 DOI: 10.1038/s41598-017-05316-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 05/26/2017] [Indexed: 11/23/2022] Open
Abstract
Lignin's aromatic building blocks provide a chemical resource that is, in theory, ideal for substitution of aromatic petrochemicals. Moreover, degradation and valorization of lignin has the potential to generate many high-value chemicals for technical applications. In this study, electrochemical degradation of alkali and Organosolv lignin was performed using the ionic liquids 1-ethyl-3-methylimidazolium trifluoromethanesulfonate and triethylammonium methanesulfonate. The extensive degradation of the investigated lignins with simultaneous almost full recovery of the electrolyte materials provided a sustainable alternative to more common lignin degradation processes. We demonstrate here that both the presence (and the absence) of water during electrolysis and proton transport reactions had significant impact on the degradation efficiency. Hydrogen peroxide radical formation promoted certain electrochemical mechanisms in electrolyte systems "contaminated" with water and increased yields of low molecular weight products significantly. The proposed mechanisms were tentatively confirmed by determining product distributions using a combination of liquid chromatography-mass spectrometry and gas-chromatography-mass spectrometry, allowing measurement of both polar versus non-polar as well as volatile versus non-volatile components in the mixtures.
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Affiliation(s)
- Tobias K F Dier
- Institute of Bioanalytical Chemistry, Saarland University, Campus B2.2, 66123, Saarbrücken, Germany
| | - Daniel Rauber
- Institute of Physical Chemistry, Saarland University, Campus B2.2, 66123, Saarbrücken, Germany
| | - Dan Durneata
- Institute of Physical Chemistry, Saarland University, Campus B2.2, 66123, Saarbrücken, Germany
| | - Rolf Hempelmann
- Institute of Physical Chemistry, Saarland University, Campus B2.2, 66123, Saarbrücken, Germany
| | - Dietrich A Volmer
- Institute of Bioanalytical Chemistry, Saarland University, Campus B2.2, 66123, Saarbrücken, Germany.
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Abstract
Liquid salts comprising molten salts and ionic liquids offer important media to address both energy and materials challenges. Here we review topics presented in this Faraday Discussion volume related to improved electrowinning of metals, optimisation of processes, new electrochemical device concepts, chemistry in ionic liquids, conversion of biomass, carbon chemistry and nuclear applications. The underlying phenomenology is then reviewed and commentary given. Some future applications are then discussed, further exemplifying the high potential rewards achievable from these chemistries.
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