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El Ali Z, Gerbeix C, Esser P, Robert P, Legrand J, Martin S, Pallardy M, Kerdine-Römer S. The role of the transcriptional factor Nrf2 in contact hypersensitivity. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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52
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El Amrani A, Betat A, Loriot S, Forster R, Legrand J. Anaesthetized guinea pig: An early safety pharmacology screening model for assessment of cardio-hemodynamic and electrophysiological parameters. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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53
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Bouchez C, Gervais F, Fleurance R, Palate B, Legrand J, Descotes J. Development of a delayed-type hypersensitivity (DTH) model in the Cynomolgus monkey. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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54
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El Amrani A, Loriot S, Giraudet F, Bétat A, Forster R, Legrand J. Safety assessment of auditory function in rat: Ototoxicity and measurements of Auditory Brainstem Response. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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55
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Gervais F, Liberge P, Palate B, Legrand J. The most common ocular histology lesions observed in rabbits and minipigs after intravitreal injection during toxicology studies. Toxicol Lett 2011. [DOI: 10.1016/j.toxlet.2011.05.695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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56
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Nicorescu I, Vial C, Talansier E, Lechevalier V, Loisel C, Della Valle D, Riaublanc A, Djelveh G, Legrand J. Comparative effect of thermal treatment on the physicochemical properties of whey and egg white protein foams. Food Hydrocoll 2011. [DOI: 10.1016/j.foodhyd.2010.09.020] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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57
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Degrenne B, Pruvost J, Titica M, Takache H, Legrand J. Kinetic modeling of light limitation and sulfur deprivation effects in the induction of hydrogen production with Chlamydomonas reinhardtii. Part II: Definition of model-based protocols and experimental validation. Biotechnol Bioeng 2011; 108:2288-99. [PMID: 21520019 DOI: 10.1002/bit.23180] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2010] [Revised: 03/17/2011] [Accepted: 04/08/2011] [Indexed: 11/11/2022]
Abstract
Photosynthetic hydrogen production under light by the green microalga Chlamydomonas reinhardtii was investigated in a torus-shaped PBR in sulfur-deprived conditions. Culture conditions, represented by the dry biomass concentration of the inoculum, sulfate concentration, and incident photon flux density (PFD), were optimized based on a previously published model (Fouchard et al., 2009. Biotechnol Bioeng 102:232-245). This allowed a strictly autotrophic production, whereas the sulfur-deprived protocol is usually applied in photoheterotrophic conditions. Experimental results combined with additional information from kinetic simulations emphasize effects of sulfur deprivation and light attenuation in the PBR in inducing anoxia and hydrogen production. A broad range of PFD was tested (up to 500 µmol photons m(-2) s(-1) ). Maximum hydrogen productivities were 1.0 ± 0.2 mL H₂ /h/L (or 25 ± 5 mL H₂ /m(2) h) and 3.1 mL ± 0.4 H₂ /h L (or 77.5 ± 10 mL H₂ /m(2) h), at 110 and 500 µmol photons m(-2) s(-1) , respectively. These values approached a maximum specific productivity of approximately 1.9 mL ± 0.4 H₂ /h/g of biomass dry weight, clearly indicative of a limitation in cell capacity to produce hydrogen. The efficiency of the process and further optimizations are discussed.
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58
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Degrenne B, Pruvost J, Legrand J. Effect of prolonged hypoxia in autotrophic conditions in the hydrogen production by the green microalga Chlamydomonas reinhardtii in photobioreactor. BIORESOURCE TECHNOLOGY 2011; 102:1035-43. [PMID: 20817442 DOI: 10.1016/j.biortech.2010.08.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2010] [Revised: 07/31/2010] [Accepted: 08/02/2010] [Indexed: 05/10/2023]
Abstract
In the context of hydrogen production by the green alga Chlamydomonas reinhardtii, the control of light attenuation conditions is used to set-up anoxia under illuminated and autotrophic conditions, without affecting photosynthetic capacities of cells (as with sulphur deprivation or PSII inhibitors like DCMU). This paper presents a full description of the protocol where the incident photons flux density (PFD) is adapted during cultivation in order to obtain a sufficiently low illuminated fraction γ under 0.25 leading to anoxic hydrogen producing conditions during several days. The protocol is validated in a torus-shape photobioreactor (PBR) revealing after few days of anoxic conditions a peak of hydrogen production (1.44 ml H2/h/l of culture; [0.8-1.0] ml H2/h/g of dry weight biomass) concomitant with a decrease of biomass concentration, protein content and maximal photosynthetic yield. Effect of over-accumulating starch, as being known to increase hydrogen production by the PSII-independent pathway, is also investigated.
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Pruvost J, Van Vooren G, Le Gouic B, Couzinet-Mossion A, Legrand J. Systematic investigation of biomass and lipid productivity by microalgae in photobioreactors for biodiesel application. BIORESOURCE TECHNOLOGY 2011; 102:150-8. [PMID: 20675127 DOI: 10.1016/j.biortech.2010.06.153] [Citation(s) in RCA: 150] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2010] [Revised: 06/23/2010] [Accepted: 06/25/2010] [Indexed: 05/04/2023]
Abstract
We describe a methodology to investigate the potential of given microalgae species for biodiesel production by characterizing their productivity in terms of both biomass and lipids. A multi-step approach was used: determination of biological needs for macronutrients (nitrate, phosphate and sulphate), determination of maximum biomass productivity (the "light-limited" regime), scaling-up of biomass production in photobioreactors, including a theoretical framework to predict corresponding productivities, and investigation of how nitrate starvation protocol affects cell biochemical composition and triggers triacylglycerol (TAG) accumulation. The methodology was applied to two freshwater strains, Chlorella vulgaris and Neochloris oleoabundans, and one seawater diatom strain, Cylindrotheca closterium. The highest total lipid content was achieved with N. oleoabundans (25-37% of DW), while the highest TAG content was found in C. vulgaris (11-14% of DW). These two species showed similar TAG productivities.
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Pruvost J, Cornet JF, Goetz V, Legrand J. Modeling dynamic functioning of rectangular photobioreactors in solar conditions. AIChE J 2010. [DOI: 10.1002/aic.12389] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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61
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Bonnaud E, Zarzoso-Lacoste D, Bourgeois K, Ruffino L, Legrand J, Vidal E. Top-predator control on islands boosts endemic prey but not mesopredator. Anim Conserv 2010. [DOI: 10.1111/j.1469-1795.2010.00376.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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62
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Nicorescu I, Vial C, Loisel C, Riaublanc A, Djelveh G, Cuvelier G, Legrand J. Influence of protein heat treatment on the continuous production of food foams. Food Res Int 2010. [DOI: 10.1016/j.foodres.2010.03.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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63
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Salhi Y, Si-Ahmed EK, Legrand J, Degrez G. Stability analysis of inclined stratified two-phase gas–liquid flow. NUCLEAR ENGINEERING AND DESIGN 2010. [DOI: 10.1016/j.nucengdes.2009.12.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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64
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Baron R, Vauchel P, Kaas R, Arhaliass A, Legrand J. Dynamical modelling of a reactive extrusion process: Focus on residence time distribution in a fully intermeshing co-rotating twin-screw extruder and application to an alginate extraction process. Chem Eng Sci 2010. [DOI: 10.1016/j.ces.2010.02.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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65
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Blel W, Legentilhomme P, Le Gentil-Lelièvre C, Faille C, Legrand J, Bénézech T. Cleanability study of complex geometries: Interaction between B. cereus spores and the different flow eddies scales. Biochem Eng J 2010. [DOI: 10.1016/j.bej.2009.11.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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66
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Pruvost J, Van Vooren G, Cogne G, Legrand J. Investigation of biomass and lipids production with Neochloris oleoabundans in photobioreactor. BIORESOURCE TECHNOLOGY 2009; 100:5988-95. [PMID: 19560349 DOI: 10.1016/j.biortech.2009.06.004] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2009] [Revised: 05/29/2009] [Accepted: 06/02/2009] [Indexed: 05/09/2023]
Abstract
The fresh water microalga Neochloris oleoabundans was investigated for its ability to accumulate lipids and especially triacylglycerols (TAG). A systematic study was conducted, from the determination of the growth medium to its characterization in an airlift photobioreactor. Without nutrient limitation, a maximal biomass areal productivity of 16.5 g m(-2) day(-1) was found. Effects of nitrogen starvation to induce lipids accumulation was next investigated. Due to initial N. oleoabundans total lipids high content (23% of dry weight), highest productivity was obtained without mineral limitation with a maximal total lipids productivity of 3.8 g m(-2) day(-1). Regarding TAG, an almost similar productivity was found whatever the protocol was: continuous production without mineral limitation (0.5 g m(-2) day(-1)) or batch production with either sudden or progressive nitrogen deprivation (0.7 g m(-2) day(-1)). The decrease in growth rate reduces the benefit of the important lipids and TAG accumulation as obtained in nitrogen starvation (37% and 18% of dry weight, respectively).
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67
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Nicorescu I, Loisel C, Riaublanc A, Vial C, Djelveh G, Cuvelier G, Legrand J. Effect of dynamic heat treatment on the physical properties of whey protein foams. Food Hydrocoll 2009. [DOI: 10.1016/j.foodhyd.2008.09.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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68
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Blel W, Le Gentil-Lelièvre C, Bénézech T, Legrand J, Legentilhomme P. Application of turbulent pulsating flows to the bacterial removal during a cleaning in place procedure. Part 1: Experimental analysis of wall shear stress in a cylindrical pipe. J FOOD ENG 2009. [DOI: 10.1016/j.jfoodeng.2008.07.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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69
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Vauchel P, Le Roux K, Leroux K, Kaas R, Arhaliass A, Baron R, Legrand J. Kinetics modeling of alginate alkaline extraction from Laminaria digitata. BIORESOURCE TECHNOLOGY 2009; 100:1291-6. [PMID: 18849163 DOI: 10.1016/j.biortech.2008.03.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2007] [Revised: 03/03/2008] [Accepted: 03/03/2008] [Indexed: 05/26/2023]
Abstract
Alginates being depolymerized during their alkaline extraction, reducing extraction time could help producing higher rheological quality alginates. The purpose of the present work is to study fresh Laminaria digitata destructuration during alkaline extraction and its link to extraction kinetics. Both alginate extraction yield and mean diameter of algae particles were followed for different values of agitation level and initial size of algae pieces. Results highlighted the existence of a link between extraction yield and algal destructuration. Those elements and the specificity of L.digitata structure have been taken into account to propose a kinetics model based on a fluid-particle reaction with decreasing size particles. The model parameters have been adjusted thanks to acquisition data and its predictive capacity was assessed by validation data. Provided predictions appeared to be relevant and the model structure suitability was confirmed, as extraction yield kinetics specific shape was quite reliably described.
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Meynard JL, Lacombe K, Poirier JM, Legrand J, Morand-Joubert L, Girard PM. Influence of liver fibrosis stage on plasma levels of efavirenz in HIV-infected patients with chronic hepatitis B or C. J Antimicrob Chemother 2009; 63:579-84. [DOI: 10.1093/jac/dkn531] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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71
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Loubière K, Olivo E, Bougaran G, Pruvost J, Robert R, Legrand J. A new photobioreactor for continuous microalgal production in hatcheries based on external-loop airlift and swirling flow. Biotechnol Bioeng 2009; 102:132-47. [DOI: 10.1002/bit.22035] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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72
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Fouchard S, Pruvost J, Degrenne B, Titica M, Legrand J. Kinetic modeling of light limitation and sulfur deprivation effects in the induction of hydrogen production withChlamydomonas reinhardtii: Part I. Model development and parameter identification. Biotechnol Bioeng 2009; 102:232-45. [DOI: 10.1002/bit.22034] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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73
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Blel W, Pierrat D, Le Gentil C, Legentilhomme P, Legrand J, Hermon C, Faille C, Bénézech T. Numerical and experimental investigations of the flow structures through a gradual expansion pipe. Trends Food Sci Technol 2009. [DOI: 10.1016/j.tifs.2009.01.043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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74
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Lazko J, Popineau Y, Renard D, Legrand J. Microcapsules based on glycinin–sodium dodecyl sulfate complex coacervation. J Microencapsul 2008; 21:59-70. [PMID: 14718186 DOI: 10.1080/02652040310001619785] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Microcapsules processed by complex coacervation were prepared using hexadecane for the oil phase and glycinin (a soybean storage protein)-sodium dodecyl sulfate (SDS) as the main wall-forming material. The study underlines the essential role of SDS, which, by the way of [glycinin(+)-SDS(-)] insoluble complex formation, allowed the precipitation of proteins around oil droplets. Moreover, particular attention was attributed to the study of suitable conditions of glycinin cross-linking with glutaraldehyde. The reticulation step was performed at pH 4.0 and it was observed that the precipitated state of proteins increased considerably the efficiency of the cross-linking reaction. Analysis of the reactional medium after each main step of the process (emulsification, complex coacervation, cross-linking) allowed the follow-up and characterization of microcapsule formation. Optimization of different process parameters such as glycinin concentration, glycinin/SDS/glutaraldehyde ratios, pH and the kinetics of cross-linking allowed the encapsulation of the totality of oil and the use of more than 98% of initially introduced proteins for the microcapsule wall formation.
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75
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Mabit J, Belhamri R, Fayolle F, Legrand J. Development of a time temperature integrator for quantification of thermal treatment in scraped surface heat exchangers. INNOV FOOD SCI EMERG 2008. [DOI: 10.1016/j.ifset.2008.01.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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