Characterization and Engineering of a Two-Enzyme System for Plastics Depolymerization
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Evaluating Feruloyl Esterase—Xylanase Synergism For
agronomy Article Evaluating Feruloyl Esterase—Xylanase Synergism for Hydroxycinnamic Acid and Xylo-Oligosaccharide Production from Untreated, Hydrothermally Pre-Treated and Dilute-Acid Pre-Treated Corn Cobs Lithalethu Mkabayi 1 , Samkelo Malgas 1 , Brendan S. Wilhelmi 2 and Brett I. Pletschke 1,* 1 Enzyme Science Programme (ESP), Department of Biochemistry and Microbiology, Rhodes University, Grahamstown, Eastern Cape 6140, South Africa; [email protected] (L.M.); [email protected] (S.M.) 2 Department of Biochemistry and Microbiology, Rhodes University, Grahamstown, Eastern Cape 6140, South Africa; [email protected] * Correspondence: [email protected]; Tel.: +27-46-6038081 Received: 4 April 2020; Accepted: 30 April 2020; Published: 13 May 2020 Abstract: Agricultural residues are considered the most promising option as a renewable feedstock for biofuel and high valued-added chemical production due to their availability and low cost. The efficient enzymatic hydrolysis of agricultural residues into value-added products such as sugars and hydroxycinnamic acids is a challenge because of the recalcitrant properties of the native biomass. Development of synergistic enzyme cocktails is required to overcome biomass residue recalcitrance, and achieve high yields of potential value-added products. In this study, the synergistic action of two termite metagenome-derived feruloyl esterases (FAE5 and FAE6), and an endo-xylanase (Xyn11) from Thermomyces lanuginosus, was optimized using 0.5% (w/v) insoluble wheat arabinoxylan (a model substrate) and then applied to 1% (w/v) corn cobs for the efficient production of xylo-oligosaccharides (XOS) and hydroxycinnamic acids. The enzyme combination of 66% Xyn11 and 33% FAE5 or FAE6 (protein loading) produced the highest amounts of XOS, ferulic acid, and p-coumaric acid from untreated, hydrothermal, and acid pre-treated corn cobs. -
Marine Microorganisms: Evolution and Solution to Pollution Fu L Li1, Wang B1,2
COMMENTARY Marine microorganisms: Evolution and solution to pollution Fu L Li1, Wang B1,2 Li FL, Wang B. Marine microorganisms: Evolution and solution to pollution. J Mar Microbiol. 2018;2(1):4-5. nce ocean nurtured life, now she needs our care. Marine microorganism will be an opportunity to further understand ourselves and to seek for new Ois the host of ocean in all ages. We should learn from them humbly. methods of fighting old infections. Marine microorganism is tightly bond with human during the history of evolution and nowadays’ environment pollution. Along with industrial revolution, our marine ecosystem suffered serious pollutions. Microplastics are tiny plastic particles (<5 mm) (Figure 1B), Although the topic is still in debate, life is probably originated from which poison marine lives. Because these microplastics are very hard to be submarine in hydrothermal vent systems (1). In the journey of evolution, our degraded, it is predicted that there will be more microplastics than fish in biosphere was completely dominated by microbes for a very long time (Figure ocean by the year 2050 (7). Since marine sediments are considered as the sink 1A). Human being evolves with those microorganisms. Consequently, of microplastics and marine microbes are key dwellers of marine sediments, the influences of microorganisms can be found in all aspects of human more attention should be paid on the interactions between microplastics biology. More than 65% of our genes originated with bacteria, archaea, and and marine microbes. Actually, a call for this has been published in 2011 unicellular eukaryotes, including those genes responsible for host-microbe (8). -
Recent Advances in Biocatalysts Engineering for Polyethylene Terephthalate Plastic Waste Green Recycling
Environment International 145 (2020) 106144 Contents lists available at ScienceDirect Environment International journal homepage: www.elsevier.com/locate/envint Review article Recent advances in biocatalysts engineering for polyethylene terephthalate plastic waste green recycling Nadia A. Samak a,b,c,1, Yunpu Jia a,b,1, Moustafa M. Sharshar a,b, Tingzhen Mu a, Maohua Yang a, Sumit Peh a,b, Jianmin Xing a,b,* a CAS Key Laboratory of Green Process and Engineering & State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China b College of Chemical Engineering, University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing 100049, PR China c Processes Design and Development Department, Egyptian Petroleum Research Institute, Nasr City, 11727 Cairo, Egypt ARTICLE INFO ABSTRACT Handling Editor: Guo-ping Sheng The massive waste of poly(ethylene terephthalate) (PET) that ends up in the landfills and oceans and needs hundreds of years for degradation has attracted global concern. The poor stability and productivity of the Keywords: available PET biocatalysts hinder their industrial applications. Active PET biocatalysts can provide a promising Plastic waste avenue for PET bioconversion and recycling. Therefore, there is an urgent need to develop new strategies that Poly(ethylene terephthalate) could enhance the stability, catalytic activity, solubility, productivity, and re-usability of these PET biocatalysts Recycling under harsh conditions such as high temperatures, pH, and salinity. This has raised great attention in using Biocatalysts ’ Bioengineering bioengineering strategies to improve PET biocatalysts robustness and catalytic behavior. Herein, historical and forecasting data of plastic production and disposal were critically reviewed. -
Synthesis of Polyesters by the Reaction of Dicarboxylic Acids with Alkyl Dihalides Using the DBU Method
Polymer Journal, Vol. 22, No. 12, pp 1043-1050 (1990) Synthesis of Polyesters by the Reaction of Dicarboxylic Acids with Alkyl Dihalides Using the DBU Method Tadatomi NISHIKUBO* and Kazuhiro OZAKI Department of Applied Chemistry, Faculty of Engineering, Kanagawa University, Rokkakubashi, Kanagawa-ku, Yokohama 221, Japan (Received July 6, 1990) ABSTRACT: Some polyesters with moderate viscosity were synthesized by reactions of dicarboxylic acids with alkyl dihalides using 1,8-diazabicyclo-[5.4.0]-7-undecene (DBU) in aprotic polar solvents such as dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) under relatively mild conditions. The viscosity and yield of the resulting polymer increased with increasing monomer concentration. Although polymers with relatively high viscosity were obtained when the reaction with p-xylylene dichloride was carried out at 70°C in DMSO, the viscosity of the resulting polymers decreased with increasing reaction temperature when the reaction with m-xylylene dibromide was carried out in DMSO. KEY WORDS Polyester Synthesis/ Dicarboxylic Acids/ Alkyl Dihalides / DBU Method / Mild Reaction Condition / Although poly(ethylene terephthalate) is favorable method for the synthesis of polyes synthesized industrially by transesterification ters because the preparation and purification between dimethyl terephthalate and ethylene of the activated. dicarboxylic acids is un glycol at relatively high temperatures using necessary. certain catalysts, many polyesters are usually Some polyesters have also been prepared8 prepared by the polycondensation of dicarbox by reactions between alkali metal salts of ylic-acid chlorides with difunctional alcohols dicarboxylic-acids and aliphatic dibromides or phenols. These reactions are carried out using phase transfer catalysis (PTC)s, which is under relatively mild conditions; however, the a very convenient method for chemical activated dicarboxylic-acid chlorides must be modification, especially esterification9 or ether prepared and purified before the reaction. -
Feruloyl Esterases: Biocatalysts to Overcome Biomass Recalcitrance and for the Production of Bioactive Compounds Dyoni M
Feruloyl esterases: Biocatalysts to overcome biomass recalcitrance and for the production of bioactive compounds Dyoni M. Oliveira, Thatiane R. Mota, Bianca Oliva, Fernando Segato, Rogério Marchiosi, Osvaldo Ferrarese-Filho, Craig Faulds, Wanderley D. dos Santos To cite this version: Dyoni M. Oliveira, Thatiane R. Mota, Bianca Oliva, Fernando Segato, Rogério Marchiosi, et al.. Feru- loyl esterases: Biocatalysts to overcome biomass recalcitrance and for the production of bioactive com- pounds. Bioresource Technology, Elsevier, 2019, 278, pp.408-423. 10.1016/j.biortech.2019.01.064. hal-02627378 HAL Id: hal-02627378 https://hal.inrae.fr/hal-02627378 Submitted on 26 May 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Distributed under a Creative Commons Attribution| 4.0 International License Accepted Manuscript Review Feruloyl esterases: Biocatalysts to overcome biomass recalcitrance and for the production of bioactive compounds Dyoni M. Oliveira, Thatiane R. Mota, Bianca Oliva, Fernando Segato, Rogério Marchiosi, Osvaldo Ferrarese-Filho, Craig -
Liquid Phase Oxidation of P-Xylene to Terephthalic Acid at Medium-High Temperatures: Multiple Benefits of CO2-Expanded Liquids
View Article Online / Journal Homepage / Table of Contents for this issue PAPER www.rsc.org/greenchem | Green Chemistry Liquid phase oxidation of p-xylene to terephthalic acid at medium-high temperatures: multiple benefits of CO2-expanded liquids Xiaobin Zuo,a,b Fenghui Niu,a Kirk Snavely,a,c Bala Subramaniam*a,c and Daryle H. Busch*a,b Received 29th September 2009, Accepted 18th November 2009 First published as an Advance Article on the web 15th January 2010 DOI: 10.1039/b920262e The Co/Mn/Br catalyzed oxidation of p-xylene to terephthalic acid (TPA) is demonstrated in CO2-expanded solvents at temperatures lower than those of the traditional Mid-Century (MC) process. As compared with the traditional air (N2/O2) oxidation system, the reaction with CO2/O2 ◦ mixture at 160 C and using an additional inert gas (N2 or CO2) pressure of 100 bar increases both the yield of TPA and the purity of solid TPA via a more efficient conversion of the intermediates, 4-carboxybenzaldehyde and p-toluic acid. At the same time, the amount of yellow colored by-products in the solid TPA product is also lessened, as determined by spectroscopic analysis. Equally important, the decomposition or burning of the solvent, acetic acid, monitored in terms of the yield of the gaseous products, CO and CO2, is reduced by ca.20%basedonlabeledCO2 experiments. These findings broaden the versatility of this new class of reaction media in homogeneous catalytic oxidations by maximizing the utilization of feedstock carbon for desired products while simultaneously reducing carbon emissions. 1. Introduction limited by the even harsher reaction conditions (T = 300–400 ◦C, P > 200 bar). -
Tannin Degradation by Phytopathogen's Tannase: a Plant's
Biocatalysis and Agricultural Biotechnology 21 (2019) 101342 Contents lists available at ScienceDirect Biocatalysis and Agricultural Biotechnology journal homepage: http://www.elsevier.com/locate/bab Tannin degradation by phytopathogen’s tannase: A Plant’s defense perspective Kanti Prakash Sharma Department of Biosciences, Mody University of Science and Technology, Lakshmangarh, Sikar, Rajasthan, 332311, India ARTICLE INFO ABSTRACT Keywords: Tannins are plant secondary metabolites and characterized as plant defensive molecules. They impose a barrier Tannin against phytopathogens invasion in plants and thus oppose diseases occurrence in them. Tannase is an enzyme Tannase known for its ability to degrade plant tannins. Important plant pathogens also possess tannase coding sequence in Plant defense their genome. Researches on tannase are till date focused on its applications in animal nutrition, in bioreme Pathogen diation and in food industries etc. The information about tannase role with respect to pathogen’s virulence is Virulence very scanty or almost nil in scientific literature. The presence of tannase in pathogen’s genome is an adaptive feature which may be a part of its strategy to overcome the negative effects of plants tannins. The present review summarizes important aspects of tannase and its possible role in disease causing ability of pathogens in plants. 1. Introduction hydrolyzable tannins (Zhang et al., 2001). In complex tannins, a cate chin or epicatechin unit is bound glycosidically to a gallotannin or an Tannins are universally present in plants and represent the fourth ellagitannin unit to yield catechin or epicatechin and gallic acid or most abundant group of secondary metabolites after cellulose, hemi ellagic acid upon hydrolysis. -
Aging Behavior and Modeling Studies of Unsaturated Polyester Resin and Unsaturated Polyester Resin-Based Blends Emmanuel Richaud, Jacques Verdu
Aging behavior and modeling studies of unsaturated polyester resin and unsaturated polyester resin-based blends Emmanuel Richaud, Jacques Verdu To cite this version: Emmanuel Richaud, Jacques Verdu. Aging behavior and modeling studies of unsaturated polyester resin and unsaturated polyester resin-based blends. Unsaturated Polyester Resins : Fundamentals, Design, Fabrication, and Applications, Elsevier, pp.199-231, 2019, 978-012816129-6. 10.1016/B978- 0-12-816129-6.00009-0. hal-02568819 HAL Id: hal-02568819 https://hal.archives-ouvertes.fr/hal-02568819 Submitted on 10 May 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. AGING BEHAVIOR AND MODELING STUDIES OF UNSATURATED POLYESTER RESIN AND UNSATURATED POLYESTER RESIN-BASED BLENDS Emmanuel Richaud and Jacques Verdu PIMM, UMR 8006, ENSAM À CNRS À CNAM, HESAM Universite,´ Paris, France 9.1 INTRODUCTION Unsaturated polyester resins (UPRs) are usually obtained from a prepolymer being a condensation product of unsaturated anhydride (or diacid) and a diol. This highly viscous liquid is dissolved in a reactive low viscosity solvent, commonly styrene (or sometimes methyl methacrylate). The curing is initiated by peroxide and metallic salt catalyst of the peroxide decomposition often called “accelerator”. -
2019 Abstracts
We are delighted EDITORIAL to welcome the worldwide yeast community in Gothenburg for ICYGMB2019! The “International Yeast Conferences” started in the 1960s with a handful of delegates and since then have become THE most important event in yeast research. Now the yeast meeting to returns to Gothenburg. Many yeast researchers still remember the meeting in 2003 with over 1,100 delegates, a truly memorable event. The Life Sciences are changing, and yeast research remains at their forefront. Advancements in genome sequencing and genome editing just make yeast more exciting as model organism in basic cell biological research, genome evolution and as a tool for synthetic biology and biotechnology. One of the most important reasons for the enormous success of yeast research lies in the unique character of the international yeast research community. No other community employs such a free exchange and access to information and research tools. Nor has any other community had the ability to build – even intercontinental – consortia of critical mass to tackle large‐scale projects, such as in sequencing the first eukaryotic genome or the first comprehensive yeast knockout library. Yeast2019 is the meeting of the international yeast research community where the latest, and even unpublished results are exchanged, and new projects, alliances, and collaborations are founded. A do‐not‐miss‐event. We attempt to incorporate the present excitement in yeast research in the programme of yeast2019. We are confident that this conference will contain important news and information for all yeast researchers. Taken together, yeast2019 will provide an up‐ to‐date overview in yeast research and it will set the scene for years to come. -
BARNES-DISSERTATION-2016.Pdf (1.557Mb)
ABSORPTION AND METABOLISM OF MANGO (MANGIFERA INDICA L.) GALLIC ACID AND GALLOYL GLYCOSIDES A Dissertation by RYAN CRISPEN BARNES Submitted to the Office of Graduate and Professional Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Chair of Committee, Stephen Talcott Co-Chair of Committee, Susanne Talcott Committee Members, Nancy Turner Arul Jayaraman Head of Department, Boon Chew December 2016 Major Subject: Food Science and Technology Copyright 2016 Ryan Barnes ABSTRACT The composition, absorption, metabolism, and excretion of gallic acid, monogalloyl glucose, and gallotannins in mango (Mangifera indica L.) pulp were investigated. Each galloyl derivative was hypothesized to have a different rate of absorption, and their concentrations were compared in the pulp of five mango varieties. The cultivar Ataulfo was found to have the highest concentration of monogalloyl glucose and gallotannins while the cultivar Kent had the lowest. Enzymatic hydrolysis of gallotannins with tannase led to the characterization of six digalloyl glucoses and five trigalloyl glucoses that have the potential to be formed in the colon following gallotannin consumption. The bioaccessibility of galloyl derivatives was evaluated in both homogenized mango pulp and 0.65 mm3 cubes following in vitro digestion conditions. Monogalloyl glucose was found to be bioaccessible in both homogenized and cubed mango pulp. However, cubed mango pulp had a significantly higher amount of gallotannins still bound to the fruit following digestion. Gallic acid bioaccessibility significantly increased following digestion in both homogenized and cubed mango pulp, likely from hydrolysis of gallotannins. Additionally, for the first time, the absorption of monogalloyl glucose and gallic acid was investigated in both Caco-2 monolayer transport models and a porcine pharmacokinetic model with no significant differences found in their absorption or ability to produce phase II metabolites. -
Nummer 18/17 03 Mei 2017 Nummer 18/17 2 03 Mei 2017
Nummer 18/17 03 mei 2017 Nummer 18/17 2 03 mei 2017 Inleiding Introduction Hoofdblad Patent Bulletin Het Blad de Industriële Eigendom verschijnt The Patent Bulletin appears on the 3rd working op de derde werkdag van een week. Indien day of each week. If the Netherlands Patent Office Octrooicentrum Nederland op deze dag is is closed to the public on the above mentioned gesloten, wordt de verschijningsdag van het blad day, the date of issue of the Bulletin is the first verschoven naar de eerstvolgende werkdag, working day thereafter, on which the Office is waarop Octrooicentrum Nederland is geopend. Het open. Each issue of the Bulletin consists of 14 blad verschijnt alleen in elektronische vorm. Elk headings. nummer van het blad bestaat uit 14 rubrieken. Bijblad Official Journal Verschijnt vier keer per jaar (januari, april, juli, Appears four times a year (January, April, July, oktober) in elektronische vorm via www.rvo.nl/ October) in electronic form on the www.rvo.nl/ octrooien. Het Bijblad bevat officiële mededelingen octrooien. The Official Journal contains en andere wetenswaardigheden waarmee announcements and other things worth knowing Octrooicentrum Nederland en zijn klanten te for the benefit of the Netherlands Patent Office and maken hebben. its customers. Abonnementsprijzen per (kalender)jaar: Subscription rates per calendar year: Hoofdblad en Bijblad: verschijnt gratis Patent Bulletin and Official Journal: free of in elektronische vorm op de website van charge in electronic form on the website of the Octrooicentrum Nederland. -
Transcriptomic Analysis of Calonectria Pseudoreteaudii During Various Stages of Eucalyptus Infection
RESEARCH ARTICLE Transcriptomic Analysis of Calonectria pseudoreteaudii during Various Stages of Eucalyptus Infection Xiaozhen Ye1,2,3, Hongyi Liu1,3, Yajie Jin1,3, Mengmeng Guo1,3, Aizhen Huang1,3, Quanzhu Chen2,3, Wenshuo Guo1,3, Feiping Zhang1, Lizhen Feng1,3* 1 Forestry College, Fujian Agriculture and Forestry University, Fuzhou, China, 2 Jinshan College, Fujian Agriculture and Forestry University, Fuzhou, China, 3 Institute of Forestry Protection, Fujian Agriculture and Forestry University, Fuzhou, China a1111111111 a1111111111 * [email protected] a1111111111 a1111111111 a1111111111 Abstract Eucalyptus leaf blight caused by Calonectria spp. is a serious disease in Eucalyptus seed- ling and plantations. However, the molecular mechanisms of the infection process and path- OPEN ACCESS ogenesis of Calonectria to Eucalyptus is not well-studied. In this study, we analyzed the Citation: Ye X, Liu H, Jin Y, Guo M, Huang A, Chen transcriptomes of C. pseudoreteaudii at three stages of Eucalyptus leaf infection, and in Q, et al. (2017) Transcriptomic Analysis of mycelium grown in potato dextrose broth using Illumina RNA-Seq technology. We identified Calonectria pseudoreteaudii during Various Stages 161 differentially expressed genes between C. pseudoreteaudii from leaf and mycelium of Eucalyptus Infection. PLoS ONE 12(1): grown in potato dextrose broth. GO and KEGG enrichment analyses of these genes sug- e0169598. doi:10.1371/journal.pone.0169598 gested that they were mainly involved in oxidoreductase activity, hydrolase activity, and Editor: Shihui Yang, National Renewable Energy transmembrane transporter activity. Most of the differentially expressed genes at the early Laboratory, UNITED STATES infection stage were upregulated. These upregulated genes were mainly involved in cell wall Received: July 31, 2016 hydrolysis and toxin synthesis, suggesting a role for toxin and cell wall hydrolases in the Accepted: December 19, 2016 establishment of Calonectria leaf blight.