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Hoang TPT, Roullier C, Evanno L, Kerzaon I, Gentil E, Robiou du Pont T, Nazih EH, Pouchus YF, Bertrand S, Poupon E, Grovel O. Nature-Inspired Chemistry of Complex Alkaloids: Combining Targeted Molecular Networking Approach and Semisynthetic Strategy to Access Rare Communesins in a Marine-Derived Penicillium expansum. Chemistry 2023:e202300103. [PMID: 36893323 DOI: 10.1002/chem.202300103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 03/08/2023] [Accepted: 03/09/2023] [Indexed: 03/11/2023]
Abstract
Communesins are rare alkaloids isolated from fungi of the genus Penicillium. In this work, the extract of a marine-derived Penicillium expansum strain was studied using targeted molecular networking approach allowing to detect 65 communesins including 55 novels. A fragmentation pattern for dimethylvinyl communesins was established and a script was implemented allowing to predict the structure and map all communesins in a global molecular network. A semisynthetic strategy was carried out to obtain some minor congeners from the two isolated communesins A and B. Nine communesins were then synthetised: two of them were already described as produced by the studied strain; four are new natural products which occurrence in the extracts was confirmed; three are new semi-synthetic analogues never described so far. These communesins were evaluated for their cytotoxicity on two human cancer cell lines KB and MCF-7 leading to a preliminary study of their structure-activity relationships.
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Affiliation(s)
| | - Catherine Roullier
- Nantes University: Universite de Nantes, UR2160 - ISOMer, UFR Sciences pharmaceutiques et Biologiques, 9 rue Bias, 44000, Nantes, FRANCE
| | - Laurent Evanno
- Université Paris-Saclay Faculté de Pharmacie: Universite Paris-Saclay Faculte de Pharmacie, Chimie des Substances Naturelles, BioCIS, FRANCE
| | - Isabelle Kerzaon
- Lyon 1 University: Universite Claude Bernard Lyon 1, Laboratoire d'écologie microbienne, LEM, UMR5557, FRANCE
| | - Emmanuel Gentil
- Nantes University: Universite de Nantes, UR2160 - ISOMer, FRANCE
| | | | - El-Hassane Nazih
- Nantes University: Universite de Nantes, UR2160 - ISOMer, FRANCE
| | | | - Samuel Bertrand
- Nantes University: Universite de Nantes, UR2160 - ISOMer, FRANCE
| | - Erwan Poupon
- Université Paris-Saclay: Universite Paris-Saclay, Chimie des Substances Naturelles, BioCIS, FRANCE
| | - Olivier Grovel
- Nantes University: Universite de Nantes, UR2160 - ISOMer, FRANCE
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2
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Ory L, Gentil E, Kumla D, Kijjoa A, Nazih EH, Roullier C. Detection of ergosterol using liquid chromatography/electrospray ionization mass spectrometry: Investigation of unusual in-source reactions. Rapid Commun Mass Spectrom 2020; 34:e8780. [PMID: 32154942 DOI: 10.1002/rcm.8780] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 02/18/2020] [Accepted: 03/08/2020] [Indexed: 06/10/2023]
Abstract
RATIONALE In the field of natural products, de-replication of complex mixtures has become a usual practice to annotate known compounds and avoid their re-isolation. For this purpose, many groups rely on liquid chromatography coupled to high-resolution mass spectrometry (HPLC/MS) to deduce molecular formulae of compounds allowing comparison with public or in-house databases. Electrospray ionization (ESI) is usually considered as the method of choice for investigating a large panel of compounds but, in some cases, it may lead to unusual results as described in this article for ergosterol. METHODS Ergosterol and other fungal sterols in methanolic solution were analysed using various chromatographic gradients with HPLC/MS using both ion trap time-of-flight MS and Orbitrap MS instruments fitted with an ESI source. Further flow injection analyses were performed to investigate the influence of the solvent composition. MS/MS fragmentation data were acquired to annotate the various ions observed. RESULTS Contrary to other fungal sterols, ergosterol was found to be highly sensitive to oxidation during ESI. Putative structures were proposed based on MS/MS studies and known oxidation mechanisms of ergosterol by reactive oxygen species that could be formed in the ESI process. The proportion of acetonitrile in the eluent was found to influence this in-source oxidation, with an increased proportion of oxidized sodium adducts with higher proportions of acetonitrile. CONCLUSIONS While ergosterol is a major sterol found in fungi, this study investigates its ionization by electrospray for the first time. The results reported here will help further detection and annotation of this compound in fungal extracts after HPLC/ESI-MS analyses.
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Affiliation(s)
- Lucie Ory
- EA2160 - MMS, Nantes University, 9 rue Bias, Nantes, 44035, France
| | - Emmanuel Gentil
- EA2160 - MMS, Nantes University, 9 rue Bias, Nantes, 44035, France
- Corsaire - ThalassOMICS, Biogenouest, Université de Nantes, Nantes, 44000, France
| | - Decha Kumla
- ICBAS - Instituto de Ciências Biomédicas Abel Salazar and CIIMAR, Universidade do Porto, Porto, 4050-313, Portugal
| | - Anake Kijjoa
- ICBAS - Instituto de Ciências Biomédicas Abel Salazar and CIIMAR, Universidade do Porto, Porto, 4050-313, Portugal
| | - El-Hassane Nazih
- EA2160 - MMS, Nantes University, 9 rue Bias, Nantes, 44035, France
| | - Catherine Roullier
- EA2160 - MMS, Nantes University, 9 rue Bias, Nantes, 44035, France
- Corsaire - ThalassOMICS, Biogenouest, Université de Nantes, Nantes, 44000, France
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3
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Laurent A, Clavreul J, Bernstad A, Bakas I, Niero M, Gentil E, Christensen TH, Hauschild MZ. Review of LCA studies of solid waste management systems--part II: methodological guidance for a better practice. Waste Manag 2014; 34:589-606. [PMID: 24388596 DOI: 10.1016/j.wasman.2013.12.004] [Citation(s) in RCA: 134] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Revised: 11/30/2013] [Accepted: 12/05/2013] [Indexed: 05/12/2023]
Abstract
Life cycle assessment (LCA) is increasingly used in waste management to identify strategies that prevent or minimise negative impacts on ecosystems, human health or natural resources. However, the quality of the provided support to decision- and policy-makers is strongly dependent on a proper conduct of the LCA. How has LCA been applied until now? Are there any inconsistencies in the past practice? To answer these questions, we draw on a critical review of 222 published LCA studies of solid waste management systems. We analyse the past practice against the ISO standard requirements and the ILCD Handbook guidelines for each major step within the goal definition, scope definition, inventory analysis, impact assessment, and interpretation phases of the methodology. Results show that malpractices exist in several aspects of the LCA with large differences across studies. Examples are a frequent neglect of the goal definition, a frequent lack of transparency and precision in the definition of the scope of the study, e.g. an unclear delimitation of the system boundaries, a truncated impact coverage, difficulties in capturing influential local specificities such as representative waste compositions into the inventory, and a frequent lack of essential sensitivity and uncertainty analyses. Many of these aspects are important for the reliability of the results. For each of them, we therefore provide detailed recommendations to practitioners of waste management LCAs.
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Affiliation(s)
- Alexis Laurent
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
| | - Julie Clavreul
- Residual Resources Engineering, Department of Environmental Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Anna Bernstad
- Water and Environmental Engineering, Department of Chemical Engineering, Lund University, 221 00 Lund, Sweden
| | - Ioannis Bakas
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Monia Niero
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark; ECO - Ecosystems and Environmental Sustainability, Department of Chemical and Biochemical Engineering, Technical University of Denmark, 4000 Roskilde, Denmark
| | | | - Thomas H Christensen
- Residual Resources Engineering, Department of Environmental Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Michael Z Hauschild
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
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4
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Laurent A, Bakas I, Clavreul J, Bernstad A, Niero M, Gentil E, Hauschild MZ, Christensen TH. Review of LCA studies of solid waste management systems--part I: lessons learned and perspectives. Waste Manag 2014; 34:573-88. [PMID: 24369845 DOI: 10.1016/j.wasman.2013.10.045] [Citation(s) in RCA: 186] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Revised: 10/02/2013] [Accepted: 10/19/2013] [Indexed: 05/17/2023]
Abstract
The continuously increasing solid waste generation worldwide calls for management strategies that integrate concerns for environmental sustainability. By quantifying environmental impacts of systems, life cycle assessment (LCA) is a tool, which can contribute to answer that call. But how, where and to which extent has it been applied to solid waste management systems (SWMSs) until now, and which lessons can be learnt from the findings of these LCA applications? To address these questions, we performed a critical review of 222 published LCA studies of SWMS. We first analysed the geographic distribution and found that the published studies have primarily been concentrated in Europe with little application in developing countries. In terms of technological coverage, they have largely overlooked application of LCA to waste prevention activities and to relevant waste types apart from household waste, e.g. construction and demolition waste. Waste management practitioners are thus encouraged to abridge these gaps in future applications of LCA. In addition to this contextual analysis, we also evaluated the findings of selected studies of good quality and found that there is little agreement in the conclusions among them. The strong dependence of each SWMS on local conditions, such as waste composition or energy system, prevents a meaningful generalisation of the LCA results as we find it in the waste hierarchy. We therefore recommend stakeholders in solid waste management to regard LCA as a tool, which, by its ability of capturing the local specific conditions in the modelling of environmental impacts and benefits of a SWMS, allows identifying critical problems and proposing improvement options adapted to the local specificities.
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Affiliation(s)
- Alexis Laurent
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
| | - Ioannis Bakas
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Julie Clavreul
- Residual Resources Engineering, Department of Environmental Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Anna Bernstad
- Water and Environmental Engineering, Department of Chemical Engineering, Lund University, 221 00 Lund, Sweden
| | - Monia Niero
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark; ECO - Ecosystems and Environmental Sustainability, Department of Chemical and Biochemical Engineering, Technical University of Denmark, 4000 Roskilde, Denmark
| | | | - Michael Z Hauschild
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Thomas H Christensen
- Residual Resources Engineering, Department of Environmental Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
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5
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Laurent A, Clavreul J, Bernstad A, Bakas I, Niero M, Gentil E, Christensen TH, Hauschild MZ. Review of LCA studies of solid waste management systems--part II: methodological guidance for a better practice. Waste Manag 2014. [PMID: 24388596 DOI: 10.1016/j.wasman.2013.12.004.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Life cycle assessment (LCA) is increasingly used in waste management to identify strategies that prevent or minimise negative impacts on ecosystems, human health or natural resources. However, the quality of the provided support to decision- and policy-makers is strongly dependent on a proper conduct of the LCA. How has LCA been applied until now? Are there any inconsistencies in the past practice? To answer these questions, we draw on a critical review of 222 published LCA studies of solid waste management systems. We analyse the past practice against the ISO standard requirements and the ILCD Handbook guidelines for each major step within the goal definition, scope definition, inventory analysis, impact assessment, and interpretation phases of the methodology. Results show that malpractices exist in several aspects of the LCA with large differences across studies. Examples are a frequent neglect of the goal definition, a frequent lack of transparency and precision in the definition of the scope of the study, e.g. an unclear delimitation of the system boundaries, a truncated impact coverage, difficulties in capturing influential local specificities such as representative waste compositions into the inventory, and a frequent lack of essential sensitivity and uncertainty analyses. Many of these aspects are important for the reliability of the results. For each of them, we therefore provide detailed recommendations to practitioners of waste management LCAs.
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Affiliation(s)
- Alexis Laurent
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
| | - Julie Clavreul
- Residual Resources Engineering, Department of Environmental Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Anna Bernstad
- Water and Environmental Engineering, Department of Chemical Engineering, Lund University, 221 00 Lund, Sweden
| | - Ioannis Bakas
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Monia Niero
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark; ECO - Ecosystems and Environmental Sustainability, Department of Chemical and Biochemical Engineering, Technical University of Denmark, 4000 Roskilde, Denmark
| | | | - Thomas H Christensen
- Residual Resources Engineering, Department of Environmental Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Michael Z Hauschild
- Division for Quantitative Sustainability Assessment, Department of Management Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
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Kwiecień RA, Kosieradzka K, Le Questel JY, Lebreton J, Fournial A, Gentil E, Delaforge M, Paneth P, Robins RJ. Cytochrome P450 Monooxygenase-Catalyzed Ring Opening of the Bicyclic Amine, Nortropine: An Experimental and DFT Computational Study. ChemCatChem 2012. [DOI: 10.1002/cctc.201100386] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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7
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Tea I, Kosieradzka K, Antheaume I, Gentil E, Robins RJ. Determination of the concentration of nitrogenous bio-organic compounds using an isotope ratio mass spectrometer operating in continuous flow mode. Anal Bioanal Chem 2011; 401:1263-71. [DOI: 10.1007/s00216-011-5182-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2011] [Revised: 06/08/2011] [Accepted: 06/13/2011] [Indexed: 10/18/2022]
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8
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Abstract
Accounting of emissions of greenhouse gas (GHG) is a major focus within waste management. This paper analyses and compares the four main types of GHG accounting in waste management including their special features and approaches: the national accounting, with reference to the Intergovernmental Panel on Climate Change (IPCC), the corporate level, as part of the annual reporting on environmental issues and social responsibility, life-cycle assessment (LCA), as an environmental basis for assessing waste management systems and technologies, and finally, the carbon trading methodology, and more specifically, the clean development mechanism (CDM) methodology, introduced to support cost-effective reduction in GHG emissions. These types of GHG accounting, in principle, have a common starting point in technical data on GHG emissions from specific waste technologies and plants, but the limited availability of data and, moreover, the different scopes of the accounting lead to many ways of quantifying emissions and producing the accounts. The importance of transparency in GHG accounting is emphasised regarding waste type, waste composition, time period considered, GHGs included, global warming potential (GWP) assigned to the GHGs, counting of biogenic carbon dioxide, choice of system boundaries, interactions with the energy system, and generic emissions factors. In order to enhance transparency and consistency, a format called the upstream-operating-downstream framework (UOD) is proposed for reporting basic technology-related data regarding GHG issues including a clear distinction between direct emissions from waste management technologies, indirect upstream (use of energy and materials) and indirect downstream (production of energy, delivery of secondary materials) activities.
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Affiliation(s)
- Emmanuel Gentil
- Department of Environmental Engineering, Technical University of Denmark, Kongens Lyngby, Denmark.
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9
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Scheutz C, Kjeldsen P, Gentil E. Greenhouse gases, radiative forcing, global warming potential and waste management--an introduction. Waste Manag Res 2009; 27:716-723. [PMID: 19748948 DOI: 10.1177/0734242x09345599] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Management of post-consumer solid waste contributes to emission of greenhouse gases (GHGs) representing about 3% of global anthropogenic GHG emissions. Most GHG reporting initiatives around the world utilize two metrics proposed by the Intergovernmental Panel on Climate Change (IPCC): radiative forcing (RF) and global warming potential (GWP). This paper provides a general introduction of the factors that define a GHG and explains the scientific background for estimating RF and GWP, thereby exposing the lay reader to a brief overview of the methods for calculating the effects of GHGs on climate change. An objective of this paper is to increase awareness that the GWP of GHGs has been re-adjusted as the concentration and relative proportion of these GHGs has changed with time (e.g., the GWP of methane has changed from 21 to 25 CO(2)-eq). Improved understanding of the indirect effects of GHGs has also led to a modification in the methodology for calculating GWP. Following a presentation of theory behind GHG, RF and GWP concepts, the paper briefly describes the most important GHG sources and sinks in the context of the waste management industry. The paper serves as a primer for more detailed research publications presented in this special issue of Waste Management & Research providing a technology-based assessment of quantitative GHG emissions from different waste management technologies.
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Affiliation(s)
- Charlotte Scheutz
- Department of Environmental Engineering, Technical University of Denmark, Kongens Lyngby, Denmark.
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10
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Christensen TH, Gentil E, Boldrin A, Larsen AW, Weidema BP, Hauschild M. C balance, carbon dioxide emissions and global warming potentials in LCA-modelling of waste management systems. Waste Manag Res 2009; 27:707-15. [PMID: 19423592 DOI: 10.1177/0734242x08096304] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Global warming potential (GWP) is an important impact category in life-cycle-assessment modelling of waste management systems. However, accounting of biogenic CO(2) emissions and sequestered biogenic carbon in landfills and in soils, amended with compost, is carried out in different ways in reported studies. A simplified model of carbon flows is presented for the waste management system and the surrounding industries, represented by the pulp and paper manufacturing industry, the forestry industry and the energy industry. The model calculated the load of C to the atmosphere, under ideal conditions, for 14 different waste management scenarios under a range of system boundary conditions and a constant consumption of C-product (here assumed to be paper) and energy production within the combined system. Five sets of criteria for assigning GWP indices to waste management systems were applied to the same 14 scenarios and tested for their ability to rank the waste management alternatives reflecting the resulting CO(2) load to the atmosphere. Two complete criteria sets were identified yielding fully consistent results; one set considers biogenic CO(2) as neutral, the other one did not. The results showed that criteria for assigning global warming contributions are partly linked to the system boundary conditions. While the boundary to the paper industry and the energy industry usually is specified in LCA studies, the boundary to the forestry industry and the interaction between forestry and the energy industry should also be specified and accounted for.
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Affiliation(s)
- Thomas H Christensen
- Department of Environmental Engineering, Technical University of Denmark, Kongens Lyngby, Denmark.
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11
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Abstract
The global warming factor (GWF; CO(2)-eq. tonne(-1) waste) performance of municipal waste management has been investigated for six representative European Member States: Denmark, France, Germany, Greece, Poland and the United Kingdom. The study integrated European waste statistical data for 2007 in a life-cycle assessment modelling perspective. It is shown that significant GWF benefit was achieved due to the high level of energy and material recovery substituting fossil energy and raw materials production, especially in Denmark and Germany. The study showed that, despite strong regulation of waste management at European level, there are major differences in GWF performance among the member states, due to the relative differences of waste composition, type of waste management technologies available nationally, and the average performance of these technologies. It has been demonstrated through a number of sensitivity analyses that, within the national framework, key waste management technology parameters can influence drastically the national GWF performance of waste management.
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Affiliation(s)
- Emmanuel Gentil
- Department of Environmental Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
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12
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Christensen TH, Gentil E, Boldrin A, Larsen AW, Weidema BP, Hauschild M. C balance, carbon dioxide emissions and global warming potentials in LCA-modelling of waste management systems. Waste Manag Res 2009. [PMID: 19423592 DOI: 10.1177/0734242x08096304.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Global warming potential (GWP) is an important impact category in life-cycle-assessment modelling of waste management systems. However, accounting of biogenic CO(2) emissions and sequestered biogenic carbon in landfills and in soils, amended with compost, is carried out in different ways in reported studies. A simplified model of carbon flows is presented for the waste management system and the surrounding industries, represented by the pulp and paper manufacturing industry, the forestry industry and the energy industry. The model calculated the load of C to the atmosphere, under ideal conditions, for 14 different waste management scenarios under a range of system boundary conditions and a constant consumption of C-product (here assumed to be paper) and energy production within the combined system. Five sets of criteria for assigning GWP indices to waste management systems were applied to the same 14 scenarios and tested for their ability to rank the waste management alternatives reflecting the resulting CO(2) load to the atmosphere. Two complete criteria sets were identified yielding fully consistent results; one set considers biogenic CO(2) as neutral, the other one did not. The results showed that criteria for assigning global warming contributions are partly linked to the system boundary conditions. While the boundary to the paper industry and the energy industry usually is specified in LCA studies, the boundary to the forestry industry and the interaction between forestry and the energy industry should also be specified and accounted for.
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Affiliation(s)
- Thomas H Christensen
- Department of Environmental Engineering, Technical University of Denmark, Kongens Lyngby, Denmark.
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13
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Mahmoud M, Gentil E, Robins RJ. Natural-abundance isotope ratio mass spectrometry as a means of evaluating carbon redistribution during glucose-citrate cofermentation by Lactococcus lactis. ACTA ACUST UNITED AC 2004; 271:4392-400. [PMID: 15560780 DOI: 10.1111/j.1432-1033.2004.04376.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The cometabolism of citrate and glucose by growing Lactococcus lactis ssp. lactis bv. diacetylactis was studied using a natural-abundance stable isotope technique. By a judicious choice of substrates differing slightly in their 13C/12C ratios, the simultaneous metabolism of citrate and glucose to a range of compounds was analysed. These end-products include lactate, acetate, formate, diacetyl and acetoin. All these products have pyruvate as a common intermediate. With the objective of estimating the degree to which glucose and citrate metabolism through pyruvate may be differentially regulated, the delta13C values of the products accumulated over a wide range of concentrations of citrate and glucose were compared. It was found that, whereas the relative accumulation of different products responds to both the substrate concentration and the ratio between the substrates, the delta13C values of the products primarily reflect the availability of the two substrates over the entire range examined. It can be concluded that in actively growing L. lactis the maintenance of pyruvate homeostasis takes precedence over the redox status of the cells as a regulatory factor.
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Affiliation(s)
- Mohamed Mahmoud
- Groupe de Fractionnement Isotopique de Métabolismes, Laboratoire d'Analyse Isotopique et Electrochimique de Métabolismes, Université de Nantes, France
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14
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Goupry S, Gentil E, Akoka S, Robins RJ. Co-fermentation of glucose and citrate by Lactococcus lactis diacetylactis: quantification of the relative metabolic rates by isotopic analysis at natural abundance. Appl Microbiol Biotechnol 2003; 62:489-97. [PMID: 12750852 DOI: 10.1007/s00253-003-1313-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2002] [Revised: 03/10/2003] [Accepted: 03/11/2003] [Indexed: 11/25/2022]
Abstract
The simultaneous catabolism of citrate and glucose by growing Lactococcus lactis subsp. lactis biovar. diacetylactis to obtain energy was followed quantitatively, using a non-enrichment isotopic technique. Both citrate and glucose are precursors of pyruvate, which may either be reduced to lactate, the principle product that accumulates, or be converted to diacetyl and acetoin. Under suitable conditions, both routes regenerate NAD+. Until recently, however, the quantitative relationships between the two substrates and these three products were poorly defined. It was recently shown, by exploiting differences in natural abundance 13C/12C ratios in the two substrates, that there is no metabolic separation of the catabolism of these two carbon sources. In this study, it is shown that the relative consumption rates change throughout the growth phase, citrate being preferentially metabolised at the onset of a culture of energy-depleted cells, with a subsequent evolution towards a metabolism dominated by glucose consumption. Additionally, it is shown that the relative consumption rates are influenced by environmental factors, notably initial pH and temperature.
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Affiliation(s)
- S Goupry
- Isotopic Fractionation in Metabolism Group, LAIEM, CNRS UMR6006, Faculté des Sciences et des Techniques, 2 rue de la Houssinière, 44322 Nantes, France
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15
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Zhang BL, Jouitteau C, Pionnier S, Gentil E. Determination of Multiple Equilibrium Isotopic Fractionation Factors at Natural Abundance in Liquid-Vapor Transitions of Organic Molecules. J Phys Chem B 2002. [DOI: 10.1021/jp013522p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ben-Li Zhang
- Laboratoire d'Analyse Isotopique et Electrochimique de Métabolismes, CNRS UMR 6006, Université de Nantes, 2, rue de la Houssinière, 44322 Nantes, France
| | - Catherine Jouitteau
- Laboratoire d'Analyse Isotopique et Electrochimique de Métabolismes, CNRS UMR 6006, Université de Nantes, 2, rue de la Houssinière, 44322 Nantes, France
| | - Sébastien Pionnier
- Laboratoire d'Analyse Isotopique et Electrochimique de Métabolismes, CNRS UMR 6006, Université de Nantes, 2, rue de la Houssinière, 44322 Nantes, France
| | - Emmanuel Gentil
- Laboratoire d'Analyse Isotopique et Electrochimique de Métabolismes, CNRS UMR 6006, Université de Nantes, 2, rue de la Houssinière, 44322 Nantes, France
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André C, Spangenberg P, Gentil E, Rabiller C. In situ 19F NMR spectroscopy study of enzymatic transglycosylation reactions using α-d-aldohexopyranosyl fluorides as donors and acceptors. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s0957-4166(01)00120-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Goupry S, Rochut N, Robins RJ, Gentil E. Evaluation of solid-phase microextraction for the isotopic analysis of volatile compounds produced during fermentation by lactic acid bacteria. J Agric Food Chem 2000; 48:2222-7. [PMID: 10888526 DOI: 10.1021/jf9908852] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The use of solid-phase microextraction (SPME) coupled with isotope ratio mass spectrometry (IRMS) for the analysis of flavor compounds produced by lactic acid bacteria has been evaluated using both liquid and headspace sampling modes. Initially, it was necessary to optimize the conditions for the SPME extraction of flavors-diacetyl and acetoin-in standard aqueous solutions. The effects of salt, headspace versus liquid sampling, and coating phase were tested. Second, the suitability of the coupling of SPME and gas chromatography-combustion interface-IRMS (GC-C-IRMS) for the determination of delta(13)C values was assessed. It is shown that neither the analyte concentration nor the period of fiber exposure has an effect on the delta(13)C values. Finally, having verified that there are no matrix effects from the fermentation medium, it is reported for the first time that flavor compounds can be extracted directly from culture supernatant by SPME and their delta(13)C values can be obtained by GC-C-IRMS.
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Affiliation(s)
- S Goupry
- Laboratoire d'Analyse Isotopique et Electrochimique de Métabolismes, CNRS UMR 6006, Faculté des Sciences et des Techniques, Nantes, France
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Goupry S, Croguennec T, Gentil E, Robins RJ. Metabolic flux in glucose/citrate co-fermentation by lactic acid bacteria as measured by isotopic ratio analysis. FEMS Microbiol Lett 2000; 182:207-11. [PMID: 10620667 DOI: 10.1111/j.1574-6968.2000.tb08896.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
The flux of carbon into lactic acid, diacetyl and acetoin during the co-metabolism of glucose and citrate by Lactococcus lactis subsp. lactis biovar. diacetylactis has been determined using natural abundance isotopic ratio analysis. During fermentation in the conditions used (glucose, 27.8 mM; citric acid, 13.9 mM; initial pH 6.2-6.4, anaerobic) it is shown that approximately 65% of the carbon source used for the aroma compounds is derived from the carbohydrate. Equally, citrate contributes approximately 30% of the carbon recovered in lactic acid. Thus, there is no evidence for a metabolic separation of the catabolism of these two carbon sources.
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Affiliation(s)
- S Goupry
- Laboratoire d'Analyse Isotopique et Electrochimique de Métabolismes, CNRS ESA 6006, Faculté des Sciences et des Techniques, 2 rue de la Houssinière, 44322, Nantes, France
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Descotes G, Ramza J, Basset JM, Pagano S, Gentil E, Banoub J. Synthesis and structural characterization of macrocyclic carbohydrate derivatives obtained from catalytic metathesis reaction with chloro-aryloxide complexes of tungsten. Tetrahedron 1996. [DOI: 10.1016/0040-4020(96)00612-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Descotes G, Gentil E, Ramzal J, Banoub J. Electrospray Mass Spectrometric Characterization of Novel Unsaturated Neutral Carbohydrate Bolaforms Obtained by Catalytic Metathesis. J BRAZIL CHEM SOC 1996. [DOI: 10.5935/0103-5053.19960067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Abstract
Two series of synthetic self-complementary isomeric DNA hexamers, namely d(CAGCTG), d(CGATCG) and d(CGTACG) (M(r) 1791) and d(CATATG), d(TGATCA) and d(TGTACA) (M(r) 1790) were analysed by negative electrospray mass spectrometry. As expected, these DNA hexamers exhibited identical series of multi-charged deprotonated molecular ions. Low-energy collision-induced dissociation tandem mass spectrometric analysis of the multi-charged oligonucleotide anions [M-3H]3- and [M-4H]4- provided characteristic and distinct finger-print patterns which permitted discrimination amongst the individual isomeric DNA hexamers and allowed complete direct sequence determination.
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Affiliation(s)
- E Gentil
- Memorial University of Newfoundland, Department of Biochemistry, St John's, Canada
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Gentil E, Potier M, Boullanger P, Descotes G. Utilisation de dérivés 2-alkoxycarbonylés dans les réactions de glucosylation. Synthèse stéréosélective d'orthocarbonates. Carbohydr Res 1990. [DOI: 10.1016/0008-6215(90)84131-d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Bulbol WS, Cavalcante A, Gentil E, Fábio Junior C. [Prevalence of arterial hypertension in the city of Manaus]. AMB Rev Assoc Med Bras 1981; 27:297-8. [PMID: 6979769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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