1
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Cheng X, Xia M, Yang Y. Biodegradation of vulcanized rubber by a gut bacterium from plastic-eating mealworms. JOURNAL OF HAZARDOUS MATERIALS 2023; 448:130940. [PMID: 36758440 DOI: 10.1016/j.jhazmat.2023.130940] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 01/15/2023] [Accepted: 02/02/2023] [Indexed: 06/18/2023]
Abstract
The disposal of vulcanized rubber waste is difficult due to the presence of three-dimensional crosslinking network structure. Here, we report that a bacterium Acinetobacter sp. BIT-H3, isolated from the gut of plastic-eating mealworm, can grow on and degrade vulcanized poly(cis-1,4-isoprene) rubber (vPR). Scanning electronic microscopy (SEM) shows that strain BIT-H3 can penetrate into the vPR and produce craters and cracks. The tensile strength and the crosslink density of vPR decreased by 53.2% and 29.3% after ten weeks' incubation, respectively. The results of Horikx analysis, attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy, and X-ray absorption near-edge structure (XANES) spectroscopy reveal that strain BIT-H3 can break down both sulfide bridges and double bonds of polymeric backbone within vPR. Sulfate and oligo(cis-1,4 isoprene) with terminal aldehyde and keto groups were identified as metabolic products released during vPR degradation. Through genomic and transcriptional analyses, five enzymes of dszA, dszC1, dszC2, Laccase2147, and Peroxidase1232 were found to be responsible for vPR degradation. Based on the chemical structure characterizations and molecular analyses, a vPR biodegradation pathway was proposed for strain BIT-H3. These findings pave a way for exploiting vulcanized rubber-degrading microorganisms from insect gut and contribute to establish a biodegradation method for vulcanized rubber waste disposal.
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Affiliation(s)
- Xiaotao Cheng
- Department of Biology, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
| | - Mengli Xia
- Department of Biology, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
| | - Yu Yang
- Department of Biology, School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China.
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2
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Lages M, Pesenti T, Zhu C, Le D, Mougin J, Guillaneuf Y, Nicolas J. Degradable polyisoprene by radical ring-opening polymerization and application to polymer prodrug nanoparticles. Chem Sci 2023; 14:3311-3325. [PMID: 36970097 PMCID: PMC10034157 DOI: 10.1039/d2sc05316k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 02/20/2023] [Indexed: 03/08/2023] Open
Abstract
Radical ring-opening copolymerization of isoprene and dibenzo[c,e]oxepane-5-thione via free-radical and controlled radical polymerizations led to degradable polyisoprene under basic, oxidative and physiological conditions with application to prodrug nanoparticles.
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Affiliation(s)
- Maëlle Lages
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 17 Avenue des Sciences, 91400 Orsay, France
| | - Théo Pesenti
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 17 Avenue des Sciences, 91400 Orsay, France
| | - Chen Zhu
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 17 Avenue des Sciences, 91400 Orsay, France
| | - Dao Le
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 17 Avenue des Sciences, 91400 Orsay, France
| | - Julie Mougin
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 17 Avenue des Sciences, 91400 Orsay, France
| | - Yohann Guillaneuf
- Aix-Marseille-Univ., CNRS, Institut de Chimie Radicalaire, UMR 7273, F-13397 Marseille, France
| | - Julien Nicolas
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 17 Avenue des Sciences, 91400 Orsay, France
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3
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Zhao X, Boruah B, Chin KF, Đokić M, Modak JM, Soo HS. Upcycling to Sustainably Reuse Plastics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2100843. [PMID: 34240472 DOI: 10.1002/adma.202100843] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/23/2021] [Indexed: 06/13/2023]
Abstract
Plastics are now indispensable in daily lives. However, the pollution from plastics is also increasingly becoming a serious environmental issue. Recent years have seen more sustainable approaches and technologies, commonly known as upcycling, to transform plastics into value-added materials and chemical feedstocks. In this review, the latest research on upcycling is presented, with a greater focus on the use of renewable energy as well as the more selective methods to repurpose synthetic polymers. First, thermal upcycling approaches are briefly introduced, including the redeployment of plastics for construction uses, 3D printing precursors, and lightweight materials. Then, some of the latest novel strategies to deconstruct condensation polymers to monomers for repolymerization or introduce vulnerable linkers to make the plastics more degradable are discussed. Subsequently, the review will explore the breakthroughs in plastics upcycling by heterogeneous and homogeneous photocatalysis, as well as electrocatalysis, which transform plastics into more versatile fine chemicals and materials while simultaneously mitigating global climate change. In addition, some of the biotechnological advances in the discovery and engineering of microbes that can decompose plastics are also presented. Finally, the current challenges and outlook for future plastics upcycling are discussed to stimulate global cooperation in this field.
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Affiliation(s)
- Xin Zhao
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Bhanupriya Boruah
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Department of Chemical Engineering, Indian Institute of Science, CV Raman Avenue, Bangalore, Karnataka, 560012, India
| | - Kek Foo Chin
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Miloš Đokić
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Jayant M Modak
- Department of Chemical Engineering, Indian Institute of Science, CV Raman Avenue, Bangalore, Karnataka, 560012, India
| | - Han Sen Soo
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Artificial Photosynthesis (Solar Fuels) Laboratory, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
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4
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Ground Tire Rubber Modified by Elastomers via Low-Temperature Extrusion Process: Physico-Mechanical Properties and Volatile Organic Emission Assessment. Polymers (Basel) 2022; 14:polym14030546. [PMID: 35160532 PMCID: PMC8839703 DOI: 10.3390/polym14030546] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 01/25/2022] [Accepted: 01/26/2022] [Indexed: 02/06/2023] Open
Abstract
In this paper, low-temperature extrusion of ground tire rubber was performed as a pro-ecological waste tires recycling method. During this process, ground tire rubber was modified with constant content of dicumyl peroxide and a variable amount of elastomer (in the range: 2.5–15 phr). During the studies, three types of elastomers were used: styrene-butadiene rubber, styrene-ethylene/butylene-styrene grafted with maleic anhydride and ethylene-octene copolymer. Energy consumption measurements, curing characteristics, physico-mechanical properties and volatile organic compounds emitted from modified reclaimed GTR were determined. The VOCs emission profile was investigated using a passive sampling technique, miniature emission chambers system and static headspace analysis and subsequently quantitative or qualitative analysis by gas chromatography. The VOCs analysis showed that in the studied conditions the most emitted volatile compounds are dicumyl peroxide decomposition by-products, such as: α-methylstyrene, acetophenone, α-cumyl alcohol, methyl cumyl ether, while the detection level of benzothiazole (devulcanization “marker”) was very low. Moreover, it was found that the mechanical properties of the obtained materials significantly improved with a higher content of styrene-butadiene rubber and styrene-ethylene/butylene-styrene grafted with maleic anhydride while the opposite trend was observed for ethylene-octene copolymer content.
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5
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GTR/Thermoplastics Blends: How Do Interfacial Interactions Govern Processing and Physico-Mechanical Properties? MATERIALS 2022; 15:ma15030841. [PMID: 35160790 PMCID: PMC8836762 DOI: 10.3390/ma15030841] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Revised: 01/13/2022] [Accepted: 01/18/2022] [Indexed: 02/04/2023]
Abstract
In this work, GTR/thermoplastics blends (in ratio 50/50 and 75/25 wt.%) were prepared by melt-compounding in an internal mixer. During research, trans-polyoctenamer rubber (TOR), ethylene-vinyl acetate copolymer (EVA), ethylene-octene copolymer (EOC), and linear low-density polyethylene (LLDPE), were used in their thermoplastic phase. Microstructure and processing-performance property interrelationships of the studied materials were investigated by: atomic force microscopy (AFM), scanning electron microscopy (SEM), rubber process analyzer (RPA), Mooney viscometer, plastometer, gas chromatography with mass spectrometry, differential scanning calorimetry (DSC), tensile tests and swelling behavior. In blends of thermoplastics with a high content of GTR (50 and 75 wt.%), the thermoplastic modifier type had a significant impact on the processing behavior and microstructure of blends. In terms of the physico-mechanical properties, the GTR/thermoplastics ratio affected elongation at break, hardness, and density, while its effect on tensile strength was negligible. DSC analysis showed that thermoplastics, as modifiers of GTR, should be considered as binders and not plasticizers, as reflected in the almost constant glass-transition temperature of the blends. RPA measurements indicated higher values of G* and η* for GTR-rich blends. SEM showed a rubber-like interfacial break, while AFM confirmed interfacial contact between GTR and thermoplastics.
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Soares FA, Steinbüchel A. Enzymatic and Chemical Approaches for Post-Polymerization Modifications of Diene Rubbers: Current state and Perspectives. Macromol Biosci 2021; 21:e2100261. [PMID: 34528407 DOI: 10.1002/mabi.202100261] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/26/2021] [Indexed: 11/07/2022]
Abstract
Diene rubbers are polymeric materials which present elastic properties and have double bonds in the macromolecular backbone after the polymerization process. Post-polymerization modifications of rubbers can be conducted by enzymatic or chemical methods. Enzymes are environmentally friendly catalysts and with the increasing demand for rubber waste management, biodegradation and biomodifications have become hot topics of research. Some rubbers are renewable materials and are a source of organic molecules, and biodegradation can be conducted to obtain either oligomers or monomers. On the other hand, chemical modifications of rubbers by click-chemistry are important strategies for the creation and combination of new materials. In a way to expand the scope of uses to other non-traditional applications, several and effective modifications can be conducted with diene rubbers. Two groups of efficient tools, enzymatic, and chemical modifications in diene rubbers, are summarized in this review. By analyzing stereochemical and reactivity aspects, the authors also point to some applications perspectives for biodegradation products and to rational modifications of diene rubbers by combining both methodologies.
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Affiliation(s)
- Franciela Arenhart Soares
- International Center for Research on Innovative Biobased Materials (ICRI-BioM)-International Research Agenda, Lodz University of Technology, Żeromskiego 116, Lodz, 90-924, Poland
| | - Alexander Steinbüchel
- International Center for Research on Innovative Biobased Materials (ICRI-BioM)-International Research Agenda, Lodz University of Technology, Żeromskiego 116, Lodz, 90-924, Poland
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7
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Thermo-oxidative degradation of vulcanized SBR: A comparison between ultraviolet (UV) and microwave as recovery techniques. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-021-02497-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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8
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Altenhoff AL, Thierbach S, Steinbüchel A. In vitro studies on the degradation of common rubber waste material with the latex clearing protein (Lcp1 VH2) of Gordonia polyisoprenivorans VH2. Biodegradation 2021; 32:113-125. [PMID: 33677743 DOI: 10.1007/s10532-020-09920-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Accepted: 11/17/2020] [Indexed: 10/22/2022]
Abstract
The enzymatic degradation of the rubber polymer poly(cis-1,4-isoprene), e.g. by the latex clearing protein Lcp1VH2 of Gordonia polyisoprenivorans VH2 has been demonstrated with latex milk or pure isoprene-rubber particles, recently. Unfortunately, carbon black filled vulcanized rubber (CFVR) making the biggest part of worldwide rubber wastes, contains several harmful additives making microbial and enzymatic rubber degradation challenging. However, this study demonstrates the successful enzymatic cleavage of industrially produced CFVR. The formation of the cleavage products, oligo(cis-1,4-isoprenoids), from incubating CFVR particles with Lcp1VH2 was detected by HPLC-MS. Various organic solvents were tested to remove harmful or inhibiting additives like antioxidants to enhance product formation. The pretreatment of CFVR particles, especially with chloroform or cyclohexane, significantly improved the degradation. It was also demonstrated that reducing the particles size and thus increasing the enzymatically accessible surface area of the particles led to a strong acceleration of the degradation process. Furthermore, ATR-IR analyses showed that Lcp1VH2 led to the functionalization of the rubber particle surface with carbonyl groups by cleaving isoprene chains, still linked to the particle. Both, the oligo(cis-1,4-isoprenoids) as well as the functionalized rubber particles, are potentially important products, which can be reused as fine chemicals or as additives in rubber production. The present study, showing the enzymatic degradation of common CFVR for the first time, takes an important step towards a new way of rubber waste disposal and indicates the economic feasibility of an efficient and environmentally friendly recycling process by using the rubber oxygenase Lcp1VH2.
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Affiliation(s)
- Anna-Lena Altenhoff
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, Corrensstraße 3, 48149, Munster, Germany
| | - Sven Thierbach
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, Corrensstraße 3, 48149, Munster, Germany
| | - Alexander Steinbüchel
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, Corrensstraße 3, 48149, Munster, Germany. .,Environmental Sciences Department, King Abdulaziz University, Jeddah, Saudi Arabia.
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9
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Zhang T, Peruch F, Wirotius AL, Ibarboure E, Rosu F, Schatz C, Garbay B. Unprecedented coupling of natural rubber and ELP: synthesis, characterization and self-assembly properties. Polym Chem 2021. [DOI: 10.1039/d1py00969a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Developing new biomaterials is an active research area owing to their applications in regenerative medicine, tissue engineering and drug delivery.
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Affiliation(s)
- Tingting Zhang
- Univ. Bordeaux, CNRS, Bordeaux INP, LCPO, UMR 5629, F-33600, Pessac, France
| | - Frédéric Peruch
- Univ. Bordeaux, CNRS, Bordeaux INP, LCPO, UMR 5629, F-33600, Pessac, France
| | | | - Emmanuel Ibarboure
- Univ. Bordeaux, CNRS, Bordeaux INP, LCPO, UMR 5629, F-33600, Pessac, France
| | - Frédéric Rosu
- Univ. Bordeaux, CNRS & Inserm, IECB, UMS3033, US001, 33607 Pessac, France
| | - Christophe Schatz
- Univ. Bordeaux, CNRS, Bordeaux INP, LCPO, UMR 5629, F-33600, Pessac, France
| | - Bertrand Garbay
- Univ. Bordeaux, CNRS, Bordeaux INP, LCPO, UMR 5629, F-33600, Pessac, France
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10
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Zedler Ł, Burger P, Wang S, Formela K. Ground Tire Rubber Modified by Ethylene-Vinyl Acetate Copolymer: Processing, Physico-Mechanical Properties, Volatile Organic Compounds Emission and Recycling Possibility. MATERIALS 2020; 13:ma13204669. [PMID: 33092105 PMCID: PMC7594032 DOI: 10.3390/ma13204669] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 10/13/2020] [Accepted: 10/16/2020] [Indexed: 02/07/2023]
Abstract
Ground tire rubber (GTR) was reclaimed and modified with 10 phr of ethylene-vinyl acetate copolymer via low-temperature extrusion process. Processing, physico-mechanical properties, volatile organic compounds emission, and recycling possibility were investigated. In order to better understand the impact of used modifiers, their efficiency was compared with trans-polyoctenamer, which is an additive that is commercially dedicated to waste rubber recycling. The results showed that a relatively small amount of ethylene-vinyl acetate copolymer improves the mechanical properties of modified reclaimed GTR and also allows further recycling by multiple processing without the deterioration of performance after three cycles.
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Affiliation(s)
- Łukasz Zedler
- Department of Polymer Technology, Faculty of Chemistry, Gdańsk University of Technology, 80–233 Gdańsk, Poland; (Ł.Z.); (P.B.)
| | - Paulina Burger
- Department of Polymer Technology, Faculty of Chemistry, Gdańsk University of Technology, 80–233 Gdańsk, Poland; (Ł.Z.); (P.B.)
| | - Shifeng Wang
- Department of Polymer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
| | - Krzysztof Formela
- Department of Polymer Technology, Faculty of Chemistry, Gdańsk University of Technology, 80–233 Gdańsk, Poland; (Ł.Z.); (P.B.)
- Correspondence:
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11
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Vinciguerra D, Jacobs M, Denis S, Mougin J, Guillaneuf Y, Lazzari G, Zhu C, Mura S, Couvreur P, Nicolas J. Heterotelechelic polymer prodrug nanoparticles: Adaptability to different drug combinations and influence of the dual functionalization on the cytotoxicity. J Control Release 2019; 295:223-236. [DOI: 10.1016/j.jconrel.2018.12.047] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Revised: 12/25/2018] [Accepted: 12/28/2018] [Indexed: 11/27/2022]
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12
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A facile route to heterotelechelic polymer prodrug nanoparticles for imaging, drug delivery and combination therapy. J Control Release 2018; 286:425-438. [DOI: 10.1016/j.jconrel.2018.08.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 07/30/2018] [Accepted: 08/07/2018] [Indexed: 12/31/2022]
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13
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Bao Y, Guégain E, Mougin J, Nicolas J. Self-stabilized, hydrophobic or PEGylated paclitaxel polymer prodrug nanoparticles for cancer therapy. Polym Chem 2018. [DOI: 10.1039/c7py01918a] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Facile derivatization of paclitaxel (Ptx) and subsequent “drug-initiated” synthesis of well-defined Ptx-polymer prodrugs was performed from nitroxide-mediated polymerization or reversible addition–fragmentation chain transfer polymerization.
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Affiliation(s)
- Yinyin Bao
- Institut Galien Paris-Sud
- CNRS UMR 8612
- Univ Paris-Sud
- Faculté de Pharmacie
- 92290 Châtenay-Malabry
| | - Elise Guégain
- Institut Galien Paris-Sud
- CNRS UMR 8612
- Univ Paris-Sud
- Faculté de Pharmacie
- 92290 Châtenay-Malabry
| | - Julie Mougin
- Institut Galien Paris-Sud
- CNRS UMR 8612
- Univ Paris-Sud
- Faculté de Pharmacie
- 92290 Châtenay-Malabry
| | - Julien Nicolas
- Institut Galien Paris-Sud
- CNRS UMR 8612
- Univ Paris-Sud
- Faculté de Pharmacie
- 92290 Châtenay-Malabry
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14
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Sugano S, Kouzai H. Solid-liquid Phase Degradation of Vulcanized Rubber Using Lipid Peroxidation. CHEM LETT 2016. [DOI: 10.1246/cl.151165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shou Sugano
- Department of Applied Chemistry, College of Science and Engineering, Kanto Gakuin University
| | - Hiroaki Kouzai
- Department of Applied Chemistry, College of Science and Engineering, Kanto Gakuin University
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15
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Delplace V, Couvreur P, Nicolas J. Recent trends in the design of anticancer polymer prodrug nanocarriers. Polym Chem 2014. [DOI: 10.1039/c3py01384g] [Citation(s) in RCA: 217] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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16
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Harrisson S, Nicolas J, Maksimenko A, Bui DT, Mougin J, Couvreur P. Nanoparticles with In Vivo Anticancer Activity from Polymer Prodrug Amphiphiles Prepared by Living Radical Polymerization. Angew Chem Int Ed Engl 2012; 52:1678-82. [DOI: 10.1002/anie.201207297] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Indexed: 11/10/2022]
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17
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Harrisson S, Nicolas J, Maksimenko A, Bui DT, Mougin J, Couvreur P. Nanoparticles with In Vivo Anticancer Activity from Polymer Prodrug Amphiphiles Prepared by Living Radical Polymerization. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201207297] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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18
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Venturi M. Due casi clinici di riassorbimento progressivo della guttaperca all’interno dei canali radicolari. GIORNALE ITALIANO DI ENDODONZIA 2012. [DOI: 10.1016/j.gien.2012.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Harrisson S, Couvreur P, Nicolas J. Use of Solvent Effects to Improve Control Over Nitroxide-Mediated Polymerization of Isoprene. Macromol Rapid Commun 2012; 33:805-10. [DOI: 10.1002/marc.201100866] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Revised: 01/16/2012] [Indexed: 11/08/2022]
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20
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Harrisson S, Couvreur P, Nicolas J. SG1 Nitroxide-Mediated Polymerization of Isoprene: Alkoxyamine Structure/Control Relationship and α,ω–Chain-End Functionalization. Macromolecules 2011. [DOI: 10.1021/ma202078q] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Simon Harrisson
- Laboratoire de Physico-Chimie, Pharmacotechnie et Biopharmacie, Université Paris-Sud, UMR CNRS 8612, Faculté de Pharmacie, 5 rue Jean-Baptiste Clément, F-92296 Châtenay-Malabry cedex, France
| | - Patrick Couvreur
- Laboratoire de Physico-Chimie, Pharmacotechnie et Biopharmacie, Université Paris-Sud, UMR CNRS 8612, Faculté de Pharmacie, 5 rue Jean-Baptiste Clément, F-92296 Châtenay-Malabry cedex, France
| | - Julien Nicolas
- Laboratoire de Physico-Chimie, Pharmacotechnie et Biopharmacie, Université Paris-Sud, UMR CNRS 8612, Faculté de Pharmacie, 5 rue Jean-Baptiste Clément, F-92296 Châtenay-Malabry cedex, France
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21
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Xu C, Chen Y, Huang J, Zeng X, Ding J. Thermal aging on mechanical properties and crosslinked network of natural rubber/zinc Dimethacrylate composites. J Appl Polym Sci 2011. [DOI: 10.1002/app.35286] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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22
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Sato S, Ohashi Y, Kojima M, Watanabe T, Honda Y, Watanabe T. Degradation of sulfide linkages between isoprenes by lipid peroxidation catalyzed by manganese peroxidase. CHEMOSPHERE 2009; 77:798-804. [PMID: 19740510 DOI: 10.1016/j.chemosphere.2009.08.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2009] [Revised: 07/31/2009] [Accepted: 08/05/2009] [Indexed: 05/28/2023]
Abstract
Scission of sulfide linkages in vulcanized rubber has been a major concern since the early 20th century, because devulcanization is a key process for recycling waste rubber products as polymer materials that pose low environmental risks. We herein demonstrate that lipid peroxidation (LPO) of linoleic acid by manganese peroxidase (MnP), a proposed lignin-degradation system in the early stage of selective white rot fungi, cleaves sulfide bond in a model rubber compound, di(2-methylpent-2-enyl) sulfide, to 2,4-dimethylthiophene and 2-methyl-2-pentenal. The major intermediate of the LPO process, 2,4-decadienal was directly oxidized by MnP to cleave the sulfur-carbon bond. We propose that electrophilic radicals from 2,4-decadienal abstract one electron from a sulfur atom of the model compound to produce the sulfur radical cation intermediate, which in turn reacts with molecular oxygen to cleave the sulfur-carbon bond. The discovery of free radical-mediated scission of sulfide bond coupled with Mn oxidation provides a novel strategy for recycling vulcanized rubber wastes.
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Affiliation(s)
- Shin Sato
- Laboratory of Biomass Conversion, Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji Kyoto 611-0011, Japan
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Schulte C, Arenskötter M, Berekaa MM, Arenskötter Q, Priefert H, Steinbüchel A. Possible involvement of an extracellular superoxide dismutase (SodA) as a radical scavenger in poly(cis-1,4-isoprene) degradation. Appl Environ Microbiol 2008; 74:7643-53. [PMID: 18952871 PMCID: PMC2607186 DOI: 10.1128/aem.01490-08] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2008] [Accepted: 10/20/2008] [Indexed: 11/20/2022] Open
Abstract
Gordonia westfalica Kb1 and Gordonia polyisoprenivorans VH2 induce the formation of an extracellular superoxide dismutase (SOD) during poly(cis-1,4-isoprene) degradation. To investigate the function of this enzyme in G. polyisoprenivorans VH2, the sodA gene was disrupted. The mutants exhibited reduced growth in liquid mineral salt media containing poly(cis-1,4-isoprene) as the sole carbon and energy source, and no SOD activity was detectable in the supernatants of the cultures. Growth experiments revealed that SodA activity is required for optimal growth on poly(cis-1,4-isoprene), whereas this enzyme has no effect on aerobic growth in the presence of water-soluble substrates like succinate, acetate, and propionate. This was detected by activity staining, and proof of expression was by antibody detection of SOD. When SodA from G. westfalica Kb1 was heterologously expressed in the sodA sodB double mutant Escherichia coli QC779, the recombinant mutant exhibited increased resistance to paraquat, thereby indicating the functionality of the G. westfalica Kb1 SodA and indirectly protection of G. westfalica cells by SodA from oxidative damage. Both sodA from G. polyisoprenivorans VH2 and sodA from G. westfalica Kb1 coded for polypeptides comprising 209 amino acids and having approximately 90% and 70% identical amino acids, respectively, to the SodA from Mycobacterium smegmatis strain MC(2) 155 and Micrococcus luteus NCTC 2665. As revealed by activity staining experiments with the wild type and the disruption mutant of G. polyisoprenivorans, this bacterium harbors only one active SOD belonging to the manganese family. The N-terminal sequences of the extracellular SodA proteins of both Gordonia species showed no evidence of leader peptides for the mature proteins, like the intracellular SodA protein of G. polyisoprenivorans VH2, which was purified under native conditions from the cells. In G. westfalica Kb1 and G. polyisoprenivorans VH2, SodA probably provides protection against reactive oxygen intermediates which occur during degradation of poly(cis-1,4-isoprene).
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Affiliation(s)
- Carina Schulte
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, Correnstrasse 3, D-48149 Münster, Germany
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Maniglia-Ferreira C, Bönecker G, Silva JBA, de Paula RCM, Feitosa JPA, Souza-Filho FJ. Degradation of trans-polyisoprene after root filling with thermoplasticized techniques. Int Endod J 2008; 41:296-302. [DOI: 10.1111/j.1365-2591.2007.01352.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Maniglia-Ferreira C, Silva JBA, de Paula RCM, Feitosa JPA, Zaia AA, Ferraz CCR, Gomes BPFA, Souza-Filho FJ. Degradation of trans-polyisoprene over time following the analysis of root fillings removed during conventional retreatment. Int Endod J 2007; 40:25-30. [PMID: 17209829 DOI: 10.1111/j.1365-2591.2006.01172.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIM To evaluate in vivo degradation of root filling materials over time. METHODOLOGY Thirty-six root filled teeth with or without periapical lesions were selected. Teeth with poor coronal restoration were not included. The teeth had been root filled 3-30 years previous and were scheduled for conventional retreatment. The association of root canal treatment, age, periapical lesion and root filling degradation was investigated. The filling material was removed from the root canal using files and no solvent. Trans-1,4-polyisoprene was isolated through solubilization of root filling remnants in chloroform followed by filtration and centrifugation. Gel permeation chromatography (GPC) and infrared spectroscopy (FT-IR) were utilized to study the occurrence and degree of degradation. The GPC and FT-IR data were collected for each sample and analysed statistically using the Kruskal-Wallis test. RESULTS Degradation of trans-1,4-polyisoprene was a slow process. The process was identified as an oxidation reaction through the production of carboxyl and hydroxyl groups. Compared with the control group, significant molar mass decrease was noted after 15 years (P = 0.0146) in teeth with no periapical lesions. However, in teeth associated with periapical lesions the number of years for significant degradation was reduced to 5 (P = 0.0009). CONCLUSION Polyisoprene degrades inside root canals as an oxidative process. The presence of periapical lesions was associated with a more rapid onset of degradation.
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Maniglia-Ferreira C, Valverde GB, Silva Jr JBA, Paula RCMD, Feitosa JPA, Souza-Filho FJD. Clinical relevance of trans 1,4-polyisoprene aging degradation on the longevity of root canal treatment. Braz Dent J 2007; 18:97-101. [DOI: 10.1590/s0103-64402007000200002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2007] [Accepted: 05/15/2007] [Indexed: 11/22/2022] Open
Abstract
This in vivo study investigated the time of degradation of root filling material (trans 1,4-polyisoprene) retrieved from endodontically treated teeth and correlated the occurrence of degradation with the longevity of endodontics. Thirty-six root-filled teeth with different filling times (2 to 30 years) and with and without periapical lesions were selected. All teeth presented clinical indication for root canal retreatment. The association among filling time, presence of periapical lesion and root filling material degradation was investigated. Root filling samples were retrieved from the root canals using a Hedströ m file without solvent. The trans 1,4-polyisoprene was isolated by root filling solubilization in chloroform followed by filtration and centrifugation. GPC and FT-IR were the analytical techniques utilized. Degradation of trans 1,4-polyisoprene occurred with time, as a slow process. It is an oxidative process, and production of carboxyl and hydroxyl groups in the residual polymer were observed. Statistically significant decrease of molar mass was observed after 5 (p=0.0001) and 15 (p=0.01) years in teeth with and without periapical lesion, respectively. Bacteria participated in polymer degradation. Gutta-percha aging was proven an important factor for the long-term success of endodontic treatment. The findings of the present study showed that, after 15 years, polymer weight loss may decrease the capacity of the filling mass to seal the root canal space and prevent re-infection, thus compromising significantly the longevity of root canal therapy.
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Silva JBA, de Paula RCM, Feitosa JPA, Gurgel-Filho ED, Maniglia-Ferreira C, de Souza Filho FJ. In vivo aging of gutta-percha dental cone. J Appl Polym Sci 2006. [DOI: 10.1002/app.23272] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Rose K, Steinbüchel A. Biodegradation of natural rubber and related compounds: recent insights into a hardly understood catabolic capability of microorganisms. Appl Environ Microbiol 2005; 71:2803-12. [PMID: 15932971 PMCID: PMC1151847 DOI: 10.1128/aem.71.6.2803-2812.2005] [Citation(s) in RCA: 134] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Karsten Rose
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 3, D-48149 Münster, Germany
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Kapich AN, Prior BA, Lundell T, Hatakka A. A rapid method to quantify pro-oxidant activity in cultures of wood-decaying white-rot fungi. J Microbiol Methods 2005; 61:261-71. [PMID: 15722153 DOI: 10.1016/j.mimet.2004.12.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2004] [Revised: 12/14/2004] [Accepted: 12/14/2004] [Indexed: 11/27/2022]
Abstract
A new, rapid method for evaluation of lipid peroxidation promoting (pro-oxidant) activity in cultures of wood-decaying fungi was developed. The method is based on measurement of the rate of oxygen consumption in the reaction of linoleic acid peroxidation initiated by fungal culture filtrates. The liquid cultures of the white-rot fungi Bjerkandera adusta and Phanerochaete chrysosporium grown on wheat straw-containing glucose-peptone-corn steep liquor medium possessed significant levels of the pro-oxidant activity. Other white-rot fungi producing manganese peroxidase (MnP) were also found to show the activity. MnP demonstrated a crucial role as the major pro-oxidant agent in the fungal cultures. The total pro-oxidant activity may be considered as net result of the peroxidation by MnP and the inhibition by antioxidant compounds present in the fungal culture fluids.
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Affiliation(s)
- A N Kapich
- Department of Applied Chemistry and Microbiology, University of Helsinki, Viikinkaari 9, Viikki Biocenter 1, P.O.Box 56, 00014 Helsinki, Finland.
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Bröker D, Arenskötter M, Legatzki A, Nies DH, Steinbüchel A. Characterization of the 101-kilobase-pair megaplasmid pKB1, isolated from the rubber-degrading bacterium Gordonia westfalica Kb1. J Bacteriol 2004; 186:212-25. [PMID: 14679241 PMCID: PMC303448 DOI: 10.1128/jb.186.1.212-225.2004] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The complete sequence of the circular 101,016-bp megaplasmid pKB1 from the cis-1,4-polyisoprene-degrading bacterium Gordonia westfalica Kb1, which represents the first described extrachromosomal DNA of a member of this genus, was determined. Plasmid pKB1 harbors 105 open reading frames. The predicted products of 46 of these are significantly related to proteins of known function. Plasmid pKB1 is organized into three functional regions that are flanked by insertion sequence (IS) elements: (i) a replication and putative partitioning region, (ii) a putative metabolic region, and (iii) a large putative conjugative transfer region, which is interrupted by an additional IS element. Southern hybridization experiments revealed the presence of another copy of this conjugational transfer region on the bacterial chromosome. The origin of replication (oriV) of pKB1 was identified and used for construction of Escherichia coli-Gordonia shuttle vectors, which was also suitable for several other Gordonia species and related genera. The metabolic region included the heavy-metal resistance gene cadA, encoding a P-type ATPase. Expression of cadA in E. coli mediated resistance to cadmium, but not to zinc, and decreased the cellular content of cadmium in this host. When G. westfalica strain Kb1 was cured of plasmid pKB1, the resulting derivative strains exhibited slightly decreased cadmium resistance. Furthermore, they had lost the ability to use isoprene rubber as a sole source of carbon and energy, suggesting that genes essential for rubber degradation are encoded by pKB1.
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Affiliation(s)
- Daniel Bröker
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, D-48149 Münster, Germany
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