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Gares M, Benaissa A, Hiligsmann S, Cherfia R, Flahaut S, Alloun W, Djelid H, Chaoua S, Kacem Chaouche N. Box-Behnken design optimization of xylanase and cellulase production by Aspergillus fumigatus on Stipa tenacissima biomass. Mycologia 2023:1-19. [PMID: 37216583 DOI: 10.1080/00275514.2023.2205331] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Accepted: 04/18/2023] [Indexed: 05/24/2023]
Abstract
Optimization of xylanase and cellulase production by a newly isolated Aspergillus fumigatus strain grown on Stipa tenacissima (alfa grass) biomass without pretreatment was carried out using a Box-Behnken design. First, the polysaccharides of dried and ground alfa grass were characterized using chemical methods (strong and diluted acid). The effect of substrate particle size on xylanase and carboxymethylcellulase (CMCase) production by the selected and identified strain was then investigated. Thereafter, experiments were statistically planned with a Box-Behnken design to optimize initial pH, cultivation temperature, moisture content, and incubation period using alfa as sole carbon source. The effect of these parameters on the two enzyme production was evaluated using the response surface method. Analysis of variance was also carried out, and production of the enzymes was expressed using a mathematical equation depending on the influencing factors. The effects of individual, interaction, and square terms on production of both enzymes were represented using the nonlinear regression equations with significant R2 and P-values. Xylanase and CMCase production levels were enhanced by 25% and 27%, respectively. Thus, this study demonstrated for the first time the potential of alfa as a raw material to produce enzymes without any pretreatment. A set of parameter combinations was found to be effective for the production of xylanase and CMCase by A. fumigatus in an alfa-based solid-state fermentation.
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Affiliation(s)
- Maroua Gares
- Laboratory of Mycology, Biotechnology and Microbial Activity, Department of Applied Biology, Faculty of Natural and Life Sciences, University of Brothers Mentouri, Constantine 25017, Algeria
| | - Akila Benaissa
- Drug and Sustainable Development Laboratory, Faculty of Process Engineering, University Salah Boubnider-Constantine 3, Constantine 25000, Algeria
| | - Serge Hiligsmann
- 3BIO-BioTech, Université Libre de Bruxelles, Av. F. Roosevelt 50, CP 165/61, Brussels 1050, Belgium
| | - Radia Cherfia
- Laboratory of Mycology, Biotechnology and Microbial Activity, Department of Applied Biology, Faculty of Natural and Life Sciences, University of Brothers Mentouri, Constantine 25017, Algeria
| | - Sigrid Flahaut
- Applied Microbiology Laboratory, Interfaculty School of Bioengineers, Université Libre de Bruxelles, Brussels 1050, Belgium
| | - Wiem Alloun
- Laboratory of Mycology, Biotechnology and Microbial Activity, Department of Applied Biology, Faculty of Natural and Life Sciences, University of Brothers Mentouri, Constantine 25017, Algeria
| | - Hadjer Djelid
- Laboratory of Mycology, Biotechnology and Microbial Activity, Department of Applied Biology, Faculty of Natural and Life Sciences, University of Brothers Mentouri, Constantine 25017, Algeria
| | - Samah Chaoua
- Laboratory of Mycology, Biotechnology and Microbial Activity, Department of Applied Biology, Faculty of Natural and Life Sciences, University of Brothers Mentouri, Constantine 25017, Algeria
- Applied Microbiology Laboratory, Interfaculty School of Bioengineers, Université Libre de Bruxelles, Brussels 1050, Belgium
| | - Noreddine Kacem Chaouche
- Laboratory of Mycology, Biotechnology and Microbial Activity, Department of Applied Biology, Faculty of Natural and Life Sciences, University of Brothers Mentouri, Constantine 25017, Algeria
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Chaoua S, Chaouche NK, Songulashvili G, Gares M, Hiligsmann S, Flahaut S. Yellow laccase produced by Trametes versicolor K1 on tomato waste: A comparative study with the blue one produced on semi-synthetic medium. J Biotechnol 2023; 361:99-109. [PMID: 36509383 DOI: 10.1016/j.jbiotec.2022.12.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 11/30/2022] [Accepted: 12/03/2022] [Indexed: 12/13/2022]
Abstract
Laccase production by fungal growth on agrifood waste is still poorly studied. Trametes versicolor K1 isolated from palm bark produced a yellow non glycosylated laccase from tomato waste based medium (TMT) and a blue glycosylated laccase on glucose medium (GLU). Lignocellulosic biomass, such as pinecones (PIN), palm leaves (PLM), olive pomace (OLV), and alfa stems (ALF) have also been used as growth medium for T. versicolor K1. In these conditions, very low or no laccase production was observed. When peptone was supplied in TMT medium, the laccase activity increased from 4170 U/L to 8618 U/L. By increasing the culture volume up to 1 L, laccase production on TMT was 9929 U/L. The yellow laccase (TmtLac) was purified from the supernatant TMT medium and has shown similar characteristics with the blue laccase (GluLac) purified from the GLU medium. Their apparent protein size was 63 kDa. Catalytic activities of the yellow form were not very different from those of the blue form, but specific activity of the purified yellow laccase produced on tomato waste was much higher. The Km and Vm values for four substrates, ABTS, DMP, guaiacol, and pyrogallol were almost similar for both isoenzymes. The optimum pH and temperature were respectively 4.0 and 50 °C. Although the level of glycosylation is clearly different, the thermostability of TmtLac and GluLac are quite similar. TmtLac is even slightly more tolerant at 60 °C for 24 h than GluLac. Moreover TmtLac showed greater stability at alkaline pH after 24 h compared to that of GluLac.We demonstrate that activity of the yellow TmtLac is not significantly affected compared to the blue laccase and that tomato waste is a simple and interesting lignocellulosic substrate to the laccase producer Trametes sp.
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Affiliation(s)
- Samah Chaoua
- Laboratoire de Mycologie, de Biotechnologie et de l'Activité Microbienne (LaMyBAM), Département de Biologie Appliquée, Université des Frères Mentouri Constantine 1, Constantine, Algeria; Laboratoire de Microbiologie Appliquée, Université Libre de Bruxelles, Brussels, Belgium.
| | - Noreddine Kacem Chaouche
- Laboratoire de Mycologie, de Biotechnologie et de l'Activité Microbienne (LaMyBAM), Département de Biologie Appliquée, Université des Frères Mentouri Constantine 1, Constantine, Algeria
| | - George Songulashvili
- Laboratoire de Microbiologie Appliquée, Université Libre de Bruxelles, Brussels, Belgium
| | - Maroua Gares
- Laboratoire de Mycologie, de Biotechnologie et de l'Activité Microbienne (LaMyBAM), Département de Biologie Appliquée, Université des Frères Mentouri Constantine 1, Constantine, Algeria
| | - Serge Hiligsmann
- Bioengineering Department, CELABOR Research Center, Herve, Belgium
| | - Sigrid Flahaut
- Laboratoire de Microbiologie Appliquée, Université Libre de Bruxelles, Brussels, Belgium
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Gares M, Hiligsmann S, Kacem Chaouche N. Lignocellulosic biomass and industrial bioprocesses for the production of second generation bio-ethanol, does it have a future in Algeria? SN Appl Sci 2020. [DOI: 10.1007/s42452-020-03442-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Liu X, Hiligsmann S, Gourdon R, Bayard R. Anaerobic digestion of lignocellulosic biomasses pretreated with Ceriporiopsis subvermispora. J Environ Manage 2017; 193:154-162. [PMID: 28213299 DOI: 10.1016/j.jenvman.2017.01.075] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 09/21/2016] [Revised: 01/26/2017] [Accepted: 01/28/2017] [Indexed: 06/06/2023]
Abstract
Fungal pretreatment by Ceriporiopsis subvermispora of two forest residues (hazel and acacia branches) and two agricultural lignocellulosic residues (barley straw and sugarcane bagasse) were studied as a pretreatment to improve their subsequent anaerobic digestion for methane production. Biomass samples were grinded to 2 ranges of particle sizes (<4 or 1 mm), autoclaved, inoculated with two strains of C. subvermispora (ATCC 90467 and ATCC 96608) and incubated at 28 °C for 28 days. The effects of fungal pretreatment were assessed by analyzing the samples before and after incubations for dry solids mass, biochemical composition, bio-methane production (BMP) and availability of cellulose to hydrolysis. The production of ligninolytic enzymes MnP and/or laccase was observed with both strains during incubation on most of the samples tested. It almost doubled the hazel branches BMP per unit mass of dry solids but did not improve however the BMP of the agricultural residues and acacia branches. These observations were explained by the fact that although both strains were able to degrade 20-25% of lignin in <1 mm and <4 mm hazel branches samples, none of them was successful however to significantly degrade lignin in the other samples, except for sugarcane bagasse.
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Affiliation(s)
- X Liu
- Univ. Lyon, INSA-Lyon, DEEP Laboratory, EA4126, Bldg. S. Carnot, 20 Avenue A. Einstein, F-69621 Villeurbanne, France
| | - S Hiligsmann
- 3BIO-BioTech, Université Libre de Bruxelles, Av. F. Roosevelt 50, CP 165/61, Brussels, Belgium
| | - R Gourdon
- Univ. Lyon, INSA-Lyon, DEEP Laboratory, EA4126, Bldg. S. Carnot, 20 Avenue A. Einstein, F-69621 Villeurbanne, France
| | - R Bayard
- Univ. Lyon, INSA-Lyon, DEEP Laboratory, EA4126, Bldg. S. Carnot, 20 Avenue A. Einstein, F-69621 Villeurbanne, France.
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Dumont G, Pilawski T, Dzaomuho-Lenieregue P, Hiligsmann S, Delvigne F, Thonart P, Robert T, Nguyen F, Hermans T. Gravimetric water distribution assessment from geoelectrical methods (ERT and EMI) in municipal solid waste landfill. Waste Manag 2016; 55:129-140. [PMID: 26926783 DOI: 10.1016/j.wasman.2016.02.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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: 10/02/2015] [Revised: 01/05/2016] [Accepted: 02/09/2016] [Indexed: 06/05/2023]
Abstract
The gravimetric water content of the waste material is a key parameter in waste biodegradation. Previous studies suggest a correlation between changes in water content and modification of electrical resistivity. This study, based on field work in Mont-Saint-Guibert landfill (Belgium), aimed, on one hand, at characterizing the relationship between gravimetric water content and electrical resistivity and on the other hand, at assessing geoelectrical methods as tools to characterize the gravimetric water distribution in a landfill. Using excavated waste samples obtained after drilling, we investigated the influences of the temperature, the liquid phase conductivity, the compaction and the water content on the electrical resistivity. Our results demonstrate that Archie's law and Campbell's law accurately describe these relationships in municipal solid waste (MSW). Next, we conducted a geophysical survey in situ using two techniques: borehole electromagnetics (EM) and electrical resistivity tomography (ERT). First, in order to validate the use of EM, EM values obtained in situ were compared to electrical resistivity of excavated waste samples from corresponding depths. The petrophysical laws were used to account for the change of environmental parameters (temperature and compaction). A rather good correlation was obtained between direct measurement on waste samples and borehole electromagnetic data. Second, ERT and EM were used to acquire a spatial distribution of the electrical resistivity. Then, using the petrophysical laws, this information was used to estimate the water content distribution. In summary, our results demonstrate that geoelectrical methods represent a pertinent approach to characterize spatial distribution of water content in municipal landfills when properly interpreted using ground truth data. These methods might therefore prove to be valuable tools in waste biodegradation optimization projects.
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Affiliation(s)
- Gaël Dumont
- Applied Geophysics, GEO(3) - ArGEnCo, Univertisity of Liege, Quartier Polytech 1, Allée de la Découverte 9, 4000 Liège, Belgium.
| | - Tamara Pilawski
- Applied Geophysics, GEO(3) - ArGEnCo, Univertisity of Liege, Quartier Polytech 1, Allée de la Découverte 9, 4000 Liège, Belgium; F.R.S.-FNRS, Brussels, Belgium.
| | - Phidias Dzaomuho-Lenieregue
- Industrial Biochemistry and Microbiology, Univertisity of Liege, Quartier Vallée 1, Chemin de la vallée 2, 4000 Liège, Belgium.
| | - Serge Hiligsmann
- Industrial Biochemistry and Microbiology, Univertisity of Liege, Quartier Vallée 1, Chemin de la vallée 2, 4000 Liège, Belgium.
| | - Frank Delvigne
- Industrial Biochemistry and Microbiology, Univertisity of Liege, Quartier Vallée 1, Chemin de la vallée 2, 4000 Liège, Belgium.
| | - Philippe Thonart
- Industrial Biochemistry and Microbiology, Univertisity of Liege, Quartier Vallée 1, Chemin de la vallée 2, 4000 Liège, Belgium.
| | - Tanguy Robert
- Applied Geophysics, GEO(3) - ArGEnCo, Univertisity of Liege, Quartier Polytech 1, Allée de la Découverte 9, 4000 Liège, Belgium.
| | - Frédéric Nguyen
- Applied Geophysics, GEO(3) - ArGEnCo, Univertisity of Liege, Quartier Polytech 1, Allée de la Découverte 9, 4000 Liège, Belgium.
| | - Thomas Hermans
- Applied Geophysics, GEO(3) - ArGEnCo, Univertisity of Liege, Quartier Polytech 1, Allée de la Découverte 9, 4000 Liège, Belgium; F.R.S.-FNRS, Brussels, Belgium.
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Masy T, Caterina D, Tromme O, Lavigne B, Thonart P, Hiligsmann S, Nguyen F. Electrical resistivity tomography to monitor enhanced biodegradation of hydrocarbons with Rhodococcus erythropolis T902.1 at a pilot scale. J Contam Hydrol 2016; 184:1-13. [PMID: 26697744 DOI: 10.1016/j.jconhyd.2015.11.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [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: 03/19/2015] [Revised: 11/02/2015] [Accepted: 11/12/2015] [Indexed: 06/05/2023]
Abstract
Petroleum hydrocarbons (HC) represent the most widespread contaminants and in-situ bioremediation remains a competitive treatment in terms of cost and environmental concerns. However, the efficiency of such a technique (by biostimulation or bioaugmentation) strongly depends on the environment affected and is still difficult to predict a priori. In order to overcome these uncertainties, Electrical Resistivity Tomography (ERT) appears as a valuable non-invasive tool to detect soil heterogeneities and to monitor biodegradation. The main objective of this study was to isolate an electrical signal linked to an enhanced bacterial activity with ERT, in an aged HC-contaminated clay loam soil. To achieve this, a pilot tank was built to mimic field conditions. Compared to a first insufficient biostimulation phase, bioaugmentation with Rhodococcus erythropolis T902.1 led to a HC depletion of almost 80% (6900 to 1600ppm) in 3months in the center of the contaminated zone, where pollutants were less bioavailable. In the meantime, lithological heterogeneities and microbial activities (growth and biosurfactant production) were successively discriminated by ERT images. In the future, this cost-effective technique should be more and more transferred to the field in order to monitor biodegradation processes and assist in selecting the most appropriate remediation technique.
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Affiliation(s)
- Thibaut Masy
- Bio-industries Research Unit, Gembloux Agro-Bio Tech, University of Liège, Passage des Déportés 2, 5030 Gembloux, Belgium; Walloon Center of Industrial Biology, Department of Health Sciences, University of Liège, Chemin de la Vallée 2 (B40), 4000 Liège, Belgium.
| | - David Caterina
- Applied Geophysics Research Unit, Department ArGEnCo, Faculty of Applied Sciences, University of Liège, Allée de la Découverte 9 (B52), 4000 Liège, Belgium.
| | - Olivier Tromme
- Sanifox SPRL, Rue Enhet-Centre 47, 5590 Chevetogne, Belgium
| | - Benoît Lavigne
- Sanifox SPRL, Rue Enhet-Centre 47, 5590 Chevetogne, Belgium
| | - Philippe Thonart
- Bio-industries Research Unit, Gembloux Agro-Bio Tech, University of Liège, Passage des Déportés 2, 5030 Gembloux, Belgium; Walloon Center of Industrial Biology, Department of Health Sciences, University of Liège, Chemin de la Vallée 2 (B40), 4000 Liège, Belgium
| | - Serge Hiligsmann
- Walloon Center of Industrial Biology, Department of Health Sciences, University of Liège, Chemin de la Vallée 2 (B40), 4000 Liège, Belgium
| | - Frédéric Nguyen
- Applied Geophysics Research Unit, Department ArGEnCo, Faculty of Applied Sciences, University of Liège, Allée de la Découverte 9 (B52), 4000 Liège, Belgium
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Kamdem I, Jacquet N, Tiappi FM, Hiligsmann S, Vanderghem C, Richel A, Jacques P, Thonart P. Comparative biochemical analysis after steam pretreatment of lignocellulosic agricultural waste biomass from Williams Cavendish banana plant (Triploid Musa AAA group). Waste Manag Res 2015; 33:1022-1032. [PMID: 26264932 DOI: 10.1177/0734242x15597998] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The accessibility of fermentable substrates to enzymes is a limiting factor for the efficient bioconversion of agricultural wastes in the context of sustainable development. This paper presents the results of a biochemical analysis performed on six combined morphological parts of Williams Cavendish Lignocellulosic Biomass (WCLB) after steam cracking (SC) and steam explosion (SE) pretreatments. Solid (S) and liquid (L) fractions (Fs) obtained from SC pretreatment performed at 180°C (SLFSC180) and 210°C (SLFSC210) generated, after diluted acid hydrolysis, the highest proportions of neutral sugar (NS) contents, specifically 52.82 ± 3.51 and 49.78 ± 1.39%w/w WCLB dry matter (DM), respectively. The highest proportions of glucose were found in SFSC210 (53.56 ± 1.33%w/w DM) and SFSC180 (44.47 ± 0.00%w/w DM), while the lowest was found in unpretreated WCLB (22.70 ± 0.71%w/w DM). Total NS content assessed in each LF immediately after SC and SE pretreatments was less than 2%w/w of the LF DM, thus revealing minor acid autohydrolysis consequently leading to minor NS production during the steam pretreatment. WCLB subjected to SC at 210 °C (SC210) generated up to 2.7-fold bioaccessible glucan and xylan. SC and SE pretreatments showed potential for the deconstruction of WCLB (delignification, depolymerization, decrystallization and deacetylation), enhancing its enzymatic hydrolysis. The concentrations of enzymatic inhibitors, such as 2-furfuraldehyde and 5-(hydroxymethyl)furfural from LFSC210, were the highest (41 and 21 µg ml(-1), respectively). This study shows that steam pretreatments in general and SC210 in particular are required for efficient bioconversion of WCLB. Yet, biotransformation through biochemical processes (e.g., anaerobic digestion) must be performed to assess the efficiency of these pretreatments.
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Affiliation(s)
- Irénée Kamdem
- Walloon Centre of Industrial Biology (CWBI), University of Liege, Belgium
| | - Nicolas Jacquet
- Unité de chimie biologique industrielle, University of Liege, Gembloux Agro-Bio Tech, Belgium
| | - Florian Mathias Tiappi
- Unité de chimie biologique industrielle, University of Liege, Gembloux Agro-Bio Tech, Belgium
| | - Serge Hiligsmann
- Walloon Centre of Industrial Biology (CWBI), University of Liege, Belgium
| | - Caroline Vanderghem
- Unité de chimie biologique industrielle, University of Liege, Gembloux Agro-Bio Tech, Belgium
| | - Aurore Richel
- Unité de chimie biologique industrielle, University of Liege, Gembloux Agro-Bio Tech, Belgium
| | - Philippe Jacques
- Walloon Centre of Industrial Biology (CWBI), University of Liege, Belgium
| | - Philippe Thonart
- Walloon Centre of Industrial Biology (CWBI), University of Liege, Belgium
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Beckers L, Masset J, Hamilton C, Delvigne F, Toye D, Crine M, Thonart P, Hiligsmann S. Investigation of the links between mass transfer conditions, dissolved hydrogen concentration and biohydrogen production by the pure strain Clostridium butyricum CWBI1009. Biochem Eng J 2015. [DOI: 10.1016/j.bej.2015.01.008] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [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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Kinet R, Destain J, Hiligsmann S, Thonart P, Delhalle L, Taminiau B, Daube G, Delvigne F. Thermophilic and cellulolytic consortium isolated from composting plants improves anaerobic digestion of cellulosic biomass: Toward a microbial resource management approach. Bioresour Technol 2015; 189:138-144. [PMID: 25879181 DOI: 10.1016/j.biortech.2015.04.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [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: 02/02/2015] [Revised: 04/01/2015] [Accepted: 04/02/2015] [Indexed: 06/04/2023]
Abstract
A cellulolytic consortium was isolated from a composting plant in order to boost the initial hydrolysis step encountered in anaerobic digestion. Improvement of the cellulose degradation, as well as biogas production, was observed for the cultures inoculated with the exogenous consortium. Metagenomics analyses pointed out a weak richness (related to the number of OTUs) of the exogenous consortium induced by the selective pressure (cellulose as sole carbon source) met during the initial isolation steps. Main microbial strains determined were strictly anaerobic and belong to the Clostridia class. During cellulose anaerobic degradation, pH drop induced a strong modification of the microbial population. Despite the fact that richness and evenness were very weak, the exogenous consortium was able to adapt and to maintain the cellulolytic degradation potential. This important result point out the fact that simplified microbial communities could be used in order to increase the robustness of mixed cultures involved in environmental biotechnology.
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Affiliation(s)
- R Kinet
- Unit of BioIndustry, Gembloux Agro-Bio Tech, University of Liège, Passage des déportés, 2, Gembloux B-5030, Belgium.
| | - J Destain
- Unit of BioIndustry, Gembloux Agro-Bio Tech, University of Liège, Passage des déportés, 2, Gembloux B-5030, Belgium
| | - S Hiligsmann
- Unit of BioIndustry, Gembloux Agro-Bio Tech, University of Liège, Passage des déportés, 2, Gembloux B-5030, Belgium
| | - P Thonart
- Unit of BioIndustry, Gembloux Agro-Bio Tech, University of Liège, Passage des déportés, 2, Gembloux B-5030, Belgium
| | - L Delhalle
- Quality Partner S.A., Rue Hayeneux, 62, Herstal B-4040, Belgium
| | - B Taminiau
- Fundamental and Applied Research for Animal & Health (FARAH), Food Science Department, Faculty of Veterinary Medicine, University of Liège, Sart-Tilman, B43b, Liège B-4000, Belgium
| | - G Daube
- Fundamental and Applied Research for Animal & Health (FARAH), Food Science Department, Faculty of Veterinary Medicine, University of Liège, Sart-Tilman, B43b, Liège B-4000, Belgium
| | - F Delvigne
- Unit of BioIndustry, Gembloux Agro-Bio Tech, University of Liège, Passage des déportés, 2, Gembloux B-5030, Belgium
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Mambanzulua Ngoma P, Hiligsmann S, Sumbu Zola E, Culot M, Fievez T, Thonart P. Comparative study of the methane production based on the chemical compositions of Mangifera Indica and Manihot Utilissima leaves. Springerplus 2015; 4:75. [PMID: 25825684 PMCID: PMC4374082 DOI: 10.1186/s40064-015-0832-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2014] [Accepted: 01/16/2015] [Indexed: 11/17/2022]
Abstract
Leaves of Mangifera Indica (MI, mango leaves) and Manihot Utilissima (MU, cassava leaves) are available in tropical regions and are the most accessible vegetal wastes of Kinshasa, capital of Democratic Republic of Congo. These wastes are not suitably managed and are not rationally valorized. They are abandoned in full air, on the soil and in the rivers. They thus pollute environment. By contrast, they can be recuperated and treated in order to produce methane (energy source), organic fertilizer and clean up the environment simultaneously. The main objective of this study was to investigate methane production from MI and MU leaves by BMP tests at 30°C. The yields achieved from the anaerobic digestion of up to 61.3 g raw matter in 1 l medium were 0.001 l/g and 0.100 l CH4/g volatile solids of MI and MU leaves, respectively. The yield of MU leaves was in the range mentioned in the literature for other leaves because of a poor presence of bioactive substrates, and low C/N ratio. This methane yield corresponded to 7% of calorific power of wood. By contrast, the methane yield from MI leaves was almost nil suggesting some metabolism inhibition because of their rich composition in carbon and bioactive substrates. Whereas classical acidogenesis and acetogenesis were recorded. Therefore, methane production from the sole MI leaves seems unfavorable by comparison to MU leaves at the ambient temperature in tropical regions. Their solid and liquid residues obtained after anaerobic digestion would be efficient fertilizers. However, the methane productivity of both leaves could be improved by anaerobic co-digestion.
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Affiliation(s)
- Philippe Mambanzulua Ngoma
- Walloon Center of Industrial Biology (CWBI), Gembloux Agro-Bio Tech, University of Liège, 2 Passage des Déportés, 5030 Gembloux, Belgium ; Faculty of Pharmaceutical Sciences, University of Kinshasa, P. O. Box 212, Kinshasa XI, Democratic Republic of Congo
| | - Serge Hiligsmann
- Walloon Center of Industrial Biology (CWBI), Gembloux Agro-Bio Tech, University of Liège, 2 Passage des Déportés, 5030 Gembloux, Belgium
| | - Eric Sumbu Zola
- Faculty of Agricultural Sciences, University of Kinshasa, P. O. Box 117, Kinshasa XI, Democratic Republic of Congo
| | - Marc Culot
- Laboratory of Microbial Ecology and Water Purification, Gembloux Agro-Bio Tech, University of Liège, B52, 27 Maréchal Juin, B-5030 Gembloux, Belgium
| | - Thierry Fievez
- Laboratory of Microbial Ecology and Water Purification, Gembloux Agro-Bio Tech, University of Liège, B52, 27 Maréchal Juin, B-5030 Gembloux, Belgium
| | - Philippe Thonart
- Walloon Center of Industrial Biology (CWBI), Gembloux Agro-Bio Tech, University of Liège, 2 Passage des Déportés, 5030 Gembloux, Belgium
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Wannoussa W, Masy T, Lambert SD, Heinrichs B, Tasseroul L, Al-Ahmad A, Weekers F, Thonar P, Hiligsmann S. Effect of Iron Nanoparticles Synthesized by a Sol-Gel Process on <i>Rhodococcus erythropolis</i> T902.1 for Biphenyl Degradation. ACTA ACUST UNITED AC 2015. [DOI: 10.4236/jwarp.2015.73021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Calusinska M, Hamilton C, Monsieurs P, Mathy G, Leys N, Franck F, Joris B, Thonart P, Hiligsmann S, Wilmotte A. Genome-wide transcriptional analysis suggests hydrogenase- and nitrogenase-mediated hydrogen production in Clostridium butyricum CWBI 1009. Biotechnol Biofuels 2015; 8:27. [PMID: 25722742 PMCID: PMC4342158 DOI: 10.1186/s13068-015-0203-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Accepted: 01/12/2015] [Indexed: 05/21/2023]
Abstract
BACKGROUND Molecular hydrogen, given its pollution-free combustion, has great potential to replace fossil fuels in future transportation and energy production. However, current industrial hydrogen production processes, such as steam reforming of methane, contribute significantly to the greenhouse effect. Therefore alternative methods, in particular the use of fermentative microorganisms, have attracted scientific interest in recent years. However the low overall yield obtained is a major challenge in biological H2 production. Thus, a thorough and detailed understanding of the relationships between genome content, gene expression patterns, pathway utilisation and metabolite synthesis is required to optimise the yield of biohydrogen production pathways. RESULTS In this study transcriptomic and proteomic analyses of the hydrogen-producing bacterium Clostridium butyricum CWBI 1009 were carried out to provide a biomolecular overview of the changes that occur when the metabolism shifts to H2 production. The growth, H2-production, and glucose-fermentation profiles were monitored in 20 L batch bioreactors under unregulated-pH and fixed-pH conditions (pH 7.3 and 5.2). Conspicuous differences were observed in the bioreactor performances and cellular metabolisms for all the tested metabolites, and they were pH dependent. During unregulated-pH glucose fermentation increased H2 production was associated with concurrent strong up-regulation of the nitrogenase coding genes. However, no such concurrent up-regulation of the [FeFe] hydrogenase genes was observed. During the fixed pH 5.2 fermentation, by contrast, the expression levels for the [FeFe] hydrogenase coding genes were higher than during the unregulated-pH fermentation, while the nitrogenase transcripts were less abundant. The overall results suggest, for the first time, that environmental factors may determine whether H2 production in C. butyricum CWBI 1009 is mediated by the hydrogenases and/or the nitrogenase. CONCLUSIONS This work, contributing to the field of dark fermentative hydrogen production, provides a multidisciplinary approach for the investigation of the processes involved in the molecular H2 metabolism of clostridia. In addition, it lays the groundwork for further optimisation of biohydrogen production pathways based on genetic engineering techniques.
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Affiliation(s)
- Magdalena Calusinska
- />Centre for Protein Engineering, Bacterial Physiology and Genetics, University of Liège, Allée de la Chimie 3, B-4000 Liège, Belgium
- />Environmental Research and Innovation Department, Luxembourg Institute of Science and Technology, Rue du Brill 41, L-4422 Belvaux, Luxembourg
| | - Christopher Hamilton
- />Walloon Centre of Industrial Biology, University of Liège, Boulevard du Rectorat 29, B-4000 Liège, Belgium
| | - Pieter Monsieurs
- />Microbiology Unit, Expertise Group for Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre (SCK-CEN), Boeretang 200, B-2400 Mol, Belgium
| | - Gregory Mathy
- />Bioenergetics Laboratory, University of Liège, Boulevard du Rectorat 27, B-4000 Liège, Belgium
| | - Natalie Leys
- />Microbiology Unit, Expertise Group for Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre (SCK-CEN), Boeretang 200, B-2400 Mol, Belgium
| | - Fabrice Franck
- />Bioenergetics Laboratory, University of Liège, Boulevard du Rectorat 27, B-4000 Liège, Belgium
| | - Bernard Joris
- />Centre for Protein Engineering, Bacterial Physiology and Genetics, University of Liège, Allée de la Chimie 3, B-4000 Liège, Belgium
| | - Philippe Thonart
- />Walloon Centre of Industrial Biology, University of Liège, Boulevard du Rectorat 29, B-4000 Liège, Belgium
| | - Serge Hiligsmann
- />Walloon Centre of Industrial Biology, University of Liège, Boulevard du Rectorat 29, B-4000 Liège, Belgium
| | - Annick Wilmotte
- />Centre for Protein Engineering, Bacterial Physiology and Genetics, University of Liège, Allée de la Chimie 3, B-4000 Liège, Belgium
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Alloue-Boraud WAM, N'Guessan KF, Djeni NT, Hiligsmann S, Djè KM, Delvigne F. Fermentation profile of Saccharomyces cerevisiae and Candida tropicalis as starter cultures on barley malt medium. J Food Sci Technol 2014; 52:5236-42. [PMID: 26243947 DOI: 10.1007/s13197-014-1526-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 08/12/2014] [Accepted: 08/15/2014] [Indexed: 11/28/2022]
Abstract
Saccharomyces cerevisiae C8-5 and Candida tropicalis F0-5 isolated from traditional sorghum beer were tested for kinetic parameters on barley malt extract, YPD (863 medium) and for alcohol production. The results showed that C. tropicalis has the highest maximum growth rate and the lowest doubling time. Values were 0.22 and 0.32 h(-1) for maximum growth rate, 3 h 09 min and 2 h 09 min for doubling time respectively on barley malt extract and YPD. On contrary, glucose consumption was the fastest with S. cerevisiae (-0.36 and -0.722 g/l/h respectively on barley malt extract and YPD). When these two yeasts were used as starters in pure culture and co-culture at proportion of 1:1 and 2:1 (cell/cell) for barley malt extract fermentation, we noticed that maltose content increased first from 12.12 g/l to 13.62-16.46 g/l and then decreased. The highest increase was obtained with starter C. tropicalis + S. cerevisiae 2:1. On contrary, glucose content decreased throughout all the fermentation process. For all the starters used, the major part of the ethanol was produced at 16 h of fermentation. Values obtained in the final beers were 11.4, 11.6, 10.4 and 10.9 g/l for fermentation conducted with S. cerevisiae, C. tropicalis, C. tropicalis + S. cerevisiae 1:1 and C. tropicalis + S. cerevisiae 2:1. Cell viability measurement during the fermentation by using flow cytometry revealed that the lowest mean channel fluorescence for FL3 (yeast rate of death) was obtained with C. tropicalis + S. cerevisiae 2:1 after 48 h of fermentation.
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Affiliation(s)
- Wazé Aimée Mireille Alloue-Boraud
- Centre Wallon de Biologie Industrielle (CWBI) Unité de Bio-industries, Université de Liège, Gembloux Agrobio-Tech, Passage des Déportés 2, 5030 Gembloux, Belgium ; Laboratoire de Biotechnologie et Microbiologie des Aliments, UFR-STA, Université Nangui Abrogoua, 02 BP 801, Abidjan 02, Côte d'Ivoire
| | - Kouadio Florent N'Guessan
- Laboratoire de Biotechnologie et Microbiologie des Aliments, UFR-STA, Université Nangui Abrogoua, 02 BP 801, Abidjan 02, Côte d'Ivoire
| | - N'Dédé Théodore Djeni
- Laboratoire de Biotechnologie et Microbiologie des Aliments, UFR-STA, Université Nangui Abrogoua, 02 BP 801, Abidjan 02, Côte d'Ivoire
| | - Serge Hiligsmann
- Centre Wallon de Biologie Industrielle, Bd du Rectorat, 29, B.40 - P.70, 4000 Liège, Belgium
| | - Koffi Marcellin Djè
- Laboratoire de Biotechnologie et Microbiologie des Aliments, UFR-STA, Université Nangui Abrogoua, 02 BP 801, Abidjan 02, Côte d'Ivoire
| | - Franck Delvigne
- Centre Wallon de Biologie Industrielle (CWBI) Unité de Bio-industries, Université de Liège, Gembloux Agrobio-Tech, Passage des Déportés 2, 5030 Gembloux, Belgium
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Plancke C, Vigeolas H, Höhner R, Roberty S, Emonds-Alt B, Larosa V, Willamme R, Duby F, Onga Dhali D, Thonart P, Hiligsmann S, Franck F, Eppe G, Cardol P, Hippler M, Remacle C. Lack of isocitrate lyase in Chlamydomonas leads to changes in carbon metabolism and in the response to oxidative stress under mixotrophic growth. Plant J 2014; 77:404-17. [PMID: 24286363 DOI: 10.1111/tpj.12392] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [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: 08/10/2013] [Revised: 10/30/2013] [Accepted: 11/21/2013] [Indexed: 05/10/2023]
Abstract
Isocitrate lyase is a key enzyme of the glyoxylate cycle. This cycle plays an essential role in cell growth on acetate, and is important for gluconeogenesis as it bypasses the two oxidative steps of the tricarboxylic acid (TCA) cycle in which CO₂ is evolved. In this paper, a null icl mutant of the green microalga Chlamydomonas reinhardtii is described. Our data show that isocitrate lyase is required for growth in darkness on acetate (heterotrophic conditions), as well as for efficient growth in the light when acetate is supplied (mixotrophic conditions). Under these latter conditions, reduced acetate assimilation and concomitant reduced respiration occur, and biomass composition analysis reveals an increase in total fatty acid content, including neutral lipids and free fatty acids. Quantitative proteomic analysis by ¹⁴N/¹⁵N labelling was performed, and more than 1600 proteins were identified. These analyses reveal a strong decrease in the amounts of enzymes of the glyoxylate cycle and gluconeogenesis in parallel with a shift of the TCA cycle towards amino acid synthesis, accompanied by an increase in free amino acids. The decrease of the glyoxylate cycle and gluconeogenesis, as well as the decrease in enzymes involved in β-oxidation of fatty acids in the icl mutant are probably major factors that contribute to remodelling of lipids in the icl mutant. These modifications are probably responsible for the elevation of the response to oxidative stress, with significantly augmented levels and activities of superoxide dismutase and ascorbate peroxidase, and increased resistance to paraquat.
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Affiliation(s)
- Charlotte Plancke
- Genetics of Microorganisms, Institute of Botany, B22, University of Liege, 4000, Liege, Belgium
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Beckers L, Hiligsmann S, Lambert SD, Heinrichs B, Thonart P. Improving effect of metal and oxide nanoparticles encapsulated in porous silica on fermentative biohydrogen production by Clostridium butyricum. Bioresour Technol 2013; 133:109-17. [PMID: 23428815 DOI: 10.1016/j.biortech.2012.12.168] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 12/23/2012] [Accepted: 12/26/2012] [Indexed: 05/09/2023]
Abstract
This paper investigated the enhancement effect of nanometre-sized metallic (Pd, Ag and Cu) or metallic oxide (FexOy) nanoparticles on fermentative hydrogen production from glucose by a Clostridium butyricum strain. These nanoparticles (NP) of about 2-3 nm were encapsulated in porous silica (SiO2) and were added at very low concentration (10(-6) mol L(-1)) in batch hydrogen production test. The cultures containing iron oxide NP produced 38% more hydrogen with a higher maximum H2 production rate (HPR) of 58% than those without NP or with silica particles only. The iron oxide NP were used in a 2.5L sequencing-batch reactor and showed no significant effect on the yields (established at 2.2 mol(hydrogen) mol(glucose)(-1)) but an improvement of the HPR (+113%, reaching a maximum HPR of 86 mL(hydrogen) L(-1) h(-1)). These results suggest an improvement of the electron transfers trough some combinations between enzymatic activity and inorganic materials.
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Affiliation(s)
- Laurent Beckers
- Centre Wallon de Biologie Industrielle (CWBI), Département des Sciences de la Vie, Université de Liège, Liège, Belgium.
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Masset J, Calusinska M, Hamilton C, Hiligsmann S, Joris B, Wilmotte A, Thonart P. Fermentative hydrogen production from glucose and starch using pure strains and artificial co-cultures ofClostridium spp. Biotechnol Biofuels 2012; 5:35. [PMID: 22616621 PMCID: PMC3474151 DOI: 10.1186/1754-6834-5-35] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Accepted: 05/22/2012] [Indexed: 05/26/2023]
Abstract
BACKGROUND Pure bacterial strains give better yields when producing H2 than mixed, natural communities. However the main drawback with the pure cultures is the need to perform the fermentations under sterile conditions. Therefore, H2 production using artificial co-cultures, composed of well characterized strains, is one of the directions currently undertaken in the field of biohydrogen research. RESULTS Four pure Clostridium cultures, including C. butyricum CWBI1009, C. pasteurianum DSM525, C. beijerinckii DSM1820 and C. felsineum DSM749, and three different co-cultures composed of (1) C. pasteurianum and C. felsineum, (2) C. butyricum and C. felsineum, (3) C. butyricum and C. pasteurianum, were grown in 20 L batch bioreactors. In the first part of the study a strategy composed of three-culture sequences was developed to determine the optimal pH for H2 production (sequence 1); and the H2-producing potential of each pure strain and co-culture, during glucose (sequence 2) and starch (sequence 3) fermentations at the optimal pH. The best H2 yields were obtained for starch fermentations, and the highest yield of 2.91 mol H2/ mol hexose was reported for C. butyricum. By contrast, the biogas production rates were higher for glucose fermentations and the highest value of 1.5 L biogas/ h was observed for the co-culture (1). In general co-cultures produced H2 at higher rates than the pure Clostridium cultures, without negatively affecting the H2 yields. Interestingly, all the Clostridium strains and co-cultures were shown to utilize lactate (present in a starch-containing medium), and C. beijerinckii was able to re-consume formate producing additional H2. In the second part of the study the co-culture (3) was used to produce H2 during 13 days of glucose fermentation in a sequencing batch reactor (SBR). In addition, the species dynamics, as monitored by qPCR (quantitative real-time PCR), showed a stable coexistence of C. pasteurianum and C. butyricum during this fermentation. CONCLUSIONS The four pure Clostridium strains and the artificial co-cultures tested in this study were shown to efficiently produce H2 using glucose and starch as carbon sources. The artificial co-cultures produced H2 at higher rates than the pure strains, while the H2 yields were only slightly affected.
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Affiliation(s)
- Julien Masset
- Walloon Centre of Industrial Biology, Boulevard du Rectorat 29, Liège, B4000, Belgium
| | - Magdalena Calusinska
- Centre for Protein Engineering, Bacterial physiology and genetics, University of Liège, Allée de la Chimie 3, Liège, B4000, Belgium
| | - Christopher Hamilton
- Walloon Centre of Industrial Biology, Boulevard du Rectorat 29, Liège, B4000, Belgium
| | - Serge Hiligsmann
- Walloon Centre of Industrial Biology, Boulevard du Rectorat 29, Liège, B4000, Belgium
| | - Bernard Joris
- Centre for Protein Engineering, Bacterial physiology and genetics, University of Liège, Allée de la Chimie 3, Liège, B4000, Belgium
| | - Annick Wilmotte
- Centre for Protein Engineering, Bacterial physiology and genetics, University of Liège, Allée de la Chimie 3, Liège, B4000, Belgium
| | - Philippe Thonart
- Walloon Centre of Industrial Biology, Boulevard du Rectorat 29, Liège, B4000, Belgium
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Hiligsmann S, Masset J, Hamilton C, Beckers L, Thonart P. Comparative study of biological hydrogen production by pure strains and consortia of facultative and strict anaerobic bacteria. Bioresour Technol 2011; 102:3810-3818. [PMID: 21185171 DOI: 10.1016/j.biortech.2010.11.094] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2010] [Revised: 11/21/2010] [Accepted: 11/22/2010] [Indexed: 05/30/2023]
Abstract
In this paper, a simple and rapid method was developed in order to assess in comparative tests the production of binary biogas mixtures containing CO(2) and another gaseous compound such as hydrogen or methane. This method was validated and experimented for the characterisation of the biochemical hydrogen potential of different pure strains and mixed cultures of hydrogen-producing bacteria (HPB) growing on glucose. The experimental results compared the hydrogen production yield of 19 different pure strains and sludges: facultative and strict anaerobic HPB strains along with anaerobic digester sludges thermally pre-treated or not. Significant yields variations were recorded even between different strains of the same species by i.e. about 20% for three Clostridium butyricum strains. The pure Clostridium butyricum and pasteurianum strains achieved the highest yields i.e. up to 1.36 mol H(2)/mol glucose compared to the yields achieved by the sludges and the tested Escherichia and Citrobacter strains.
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Affiliation(s)
- Serge Hiligsmann
- Walloon Centre of Industrial Biology (CWBI), Bd du Rectorat, 29, B.40 - P.70, B-4000 Liege, Belgium.
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Rodriguez C, Hiligsmann S, Ongena M, Charlier R, Thonart P. Development of an enzymatic assay for the determination of cellulose bioavailability in municipal solid waste. Biodegradation 2005; 16:415-22. [PMID: 15865155 DOI: 10.1007/s10532-004-3575-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [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]
Abstract
As there is a constant need to assess the biodegradation potential of refuse disposed of in landfills, we have developed a method to evaluate the biodegradability of cellulosic compounds (cellulose and hemicellulose) in municipal solid waste. This test is based on the quantification of monosaccharides released after the hydrolysis of solid waste samples with an optimised enzyme preparation containing commercially available cellulases and hemicellulases. We show that the amounts of monosaccharides could be related to the biodegradability of the cellulosic material contained in the samples. This enzymatic cellulose degradation test was assayed on 37 samples originating from three Belgian landfills and collected at different depths. As results correlated well with those obtained with a classical biochemical methane potential assay, this new and rapid test is sufficiently reliable to evaluate cellulose bioavailability in waste samples.
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Affiliation(s)
- Christian Rodriguez
- Walloon Center of Industrial Biology, Unit of Microbial Technology, University of Liège, Bd. du Rectorat, B40, B-4000 Sart-Tilman, Belgium.
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Sabri A, Jacques P, Weekers F, Baré G, Hiligsmann S, Moussaïf M, Thonart P. Effect of temperature on growth of psychrophilic and psychrotrophic members of Rhodotorula aurantiaca. Appl Biochem Biotechnol 2000; 84-86:391-9. [PMID: 10849805 DOI: 10.1385/abab:84-86:1-9:391] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [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: 11/11/2022]
Abstract
The thermo-dependence of growth kinetic parameters was investigated for the Antarctic psychrophilic strain Rhodotorula aurantiaca and a psychrotrophic strain of the same species isolated in Belgium (Ardennes area). Cell production, maximum growth rate (mu max), and half-saturation constant for glucose uptake (Ks) of both yeasts were temperature dependent. For the two yeasts, a maximum cell production was observed at about 0 degree C, and cell production decreased when temperature increased. The mu max values for both strains increased with temperature up to a maximum of 10 degrees C for the psychrophilic strain and 17 degrees C for the psychrotrophic strain. For both yeasts, Ks for glucose was relatively constant at low temperatures. It increased at temperatures above 10 degrees C for the psychrophilic strain and 17 degrees C for the psychrotrophic strain. Although its glucose affinity was lower, the psychrotrophic strain grew more rapidly than the psychrophilic one. The difference in growth rate and substrate affinity was related to the origin of the strain and the adaptation strategy of R. aurantiaca to environmental conditions.
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Affiliation(s)
- A Sabri
- Centre Wallon de Biologie Industrielle, University of Liege, Belgium.
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Abstract
Eleven pure strains of sulfate-reducing bacteria have been isolated from lab-scale bioreactors or gypsum disposal sites, all featuring relatively high concentrations of sulfate, and from natural environments in order to produce sulfide from gypsum using hydrogen as energy source. The properties of the eleven strains have been investigated and compared to these of three collection strains i.e. Desulfovibrio desulfuricans and Dv. vulgaris and Desulfotomaculum orientis. Particular attention was paid to the volumetric and specific sulfide production rate and to the hydrogen sulfide inhibition level. By comparison to the three collection strains, a 75% higher production rate and a hydrogen sulfide inhibition level about twice as high i.e. 25.1 mM have been achieved with strains isolated from sulfate-rich environments. The strain selection, particularly from sulfate-rich environments, should be considered as an optimization factor for the sulfate reduction processes.
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Affiliation(s)
- S Hiligsmann
- University of Liege, Centre Wallon de Biologie Industrielle, Belgium
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Hiligsmann S, Deswaef S, Taillieu X, Crine M, Milande N, Thonart P. Production of sulfur from gypsum as an industrial byproduct. Appl Biochem Biotechnol 1996. [DOI: 10.1007/bf02941776] [Citation(s) in RCA: 4] [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: 11/28/2022]
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