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عنوان فارسی مقاله:
تبدیل کاتالیزی لاکاز-میانجی بوسیله مدل لیگنین مواد مرکب
عنوان انگلیسی مقاله:
Laccase-mediator catalyzed conversion of model lignin compounds
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
A biorefinery integrates unit operations to convert biomass into a variety of biobased products, including fuels, chemicals, energy, and feed. Government policy initiatives over the last decade have emphasized the production of biobased fuels, and consequently the number of dry-grind ethanol biorefineries has increased significantly. Historically, fuel ethanol biorefineries have produced only two primary products – ethanol and distillers grains. More recently, corn oil and carbon dioxide provided additional revenue streams. However, the growth and sustainability of the biorefining industry requires the development of more value-added products from abundant agricultural feedstocks, including lignocellulosics. The modern ethanol dry-grind biorefinery generally produces two primary products – ethanol and distillers grains. Well-established conventional corn-to-ethanol plants have struggled with fluctuations in the price of corn and stagnant demand for transportation fuels, while the cellulosic biofuel industry remains in its infancy. Current gasoline blending rates restrict the growth of the ethanol sector, and although distillers grains are a significant revenue stream to commercial ethanol plants, their value is generally limited to animal feed. To improve the economic viability of the biorefining industry, there is a need for novel products from renewable biomass-based feedstocks. Combinatorial biocatalysis uses multiple catalysts and iterations to create focused libraries of complex natural products or synthetic compounds (Michels et al., 1998; Altreuter and Clark, 1999; Rich et al., 2002, 2009). This approach uses biocatalysts that have evolved for the synthesis of complex natural products and exploits the broad array of chemistries required for the production and degradation of organic biomolecules that occur under relatively mild conditions. Some of these reactions (e.g., oxidations, esterifications) are difficult to selectively reproduce using purely chemical means. Fungal laccases used with oxidizable low-molecular-weight compounds (mediators) are able to oxidize some nonsubstrate compounds (Bourbonnais and Paice, 1990; Johannes and Majcherczyk, 2000; Riva, 2006; Morozova et al., 2007). While this laccase-mediator system (LMS) has received widespread attention for bleaching kraft pulp (Bourbonnais et al., 1997), these laccasemediator systems can be applied to the oxidation of various compounds. Redox mediators accelerate the reaction rate by shuttling electrons from the biological oxidation of primary electron donors to the electron-accepting organic compound (Husain and Husain, 2008), and their mechanism of action has been the subject of significant research (Crestini et al., 2003; Wong, 2009). Biocatalytic oxidative chemistries provide opportunities toselectively introduce new functionality into a structurally complex natural product (Rich et al., 2009). Using combinations of dozens of mediators with 10–20 commercially available laccase enzymes will provide hundreds of combinations that will be efficiently handled using automated synthetic and analytical methods (Larson et al., 2013). This approach will identify reaction systems, including biocatalyst and mediating substrate, that are efficient for introducing new functional moieties into structurally complex natural products, such as lignin.
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کلمات کلیدی:
Laccase-mediator catalyzed conversion of model lignin ... - USDA ARS https://www.ars.usda.gov/research/publications/publication/?seqNo115=314694 by J Rich - 2016 - Cited by 2 - Related articles Jan 5, 2016 - Citation: Rich, J.O., Anderson, A.M., Larson, T.M. 2016. Laccase-mediator catalyzed conversion of model lignin compounds. Meeting Abstract. Laccase-mediator catalyzed conversion of model lignin ... - USDA ARS https://www.ars.usda.gov/research/publications/publication/?seqNo115=322667 by J Rich - 2016 - Cited by 2 - Related articles Jan 7, 2016 - Citation: Rich, J.O., Anderson, A.M., Berhow, M.A. 2016. Laccase-mediator catalyzed conversion of model lignin compounds. Biocatalysis and ... Laccase-mediator catalyzed conversion of model lignin ... - INFONA https://www.infona.pl/.../bwmeta1.element.elsevier-4b096784-c833-3489-be55-337b... by JO Rich - 2016 - Cited by 2 - Related articles We identified both mediated and non-mediated laccase-catalyzed reactions that converted p-coumaryl alcohol and sinapyl alcohol to p-hydroxybenzaldehyde ... Laccase Catalyzed Synthesis of Iodinated Phenolic Compounds with ... journals.plos.org/plosone/article?id=10.1371/journal.pone.0089924 by J Ihssen - 2014 - Cited by 8 - Related articles Mar 3, 2014 - No conversion of vanillin occurred in the absence of enzyme. The addition of redox mediators in catalytic concentrations increased the rate of ... The effect of phenolic mediators in oxidoreductase catalyzed ... - Helda https://helda.helsinki.fi/handle/10138/182238 Translate this page by P Nousiainen - 2017 The effect of phenolic mediators in oxidoreductase catalyzed conversion of lignin ... to screen their effect and potential in laccase-catalyzed oxidation reactions. Oxidation of phenols by laccase and laccase-mediator systems - d ... onlinelibrary.wiley.com/doi/10.1046/j.1432-1033.2002.03256.x/full by F d'Acunzo - 2002 - Cited by 92 - Related articles Oct 17, 2002 - The extent of substrate conversion, and the nature of the products formed in buffered ... Catalytic cycle of a laccase-mediator oxidation system.
