Consulta: creatorFacets:"Baron, Regis"
Registros recuperados: 41
Data/hora: 09/06/2024 13:21:31

Procédé d'extrusion réactive et/ou enzymatique pour l'extraction de phycocolloïdes : application aux produits de la mer
Provedor de dados: 5
Autores: Makoure, Dounia; Arhaliass, Abdellah; Echchelh, Adil; Baron, Regis; Legrand, Jack.
In this paper we present the reactive extrusion process to extract the phycocolloids from the sea products. By comparing with other techniques, this process has a several advantages like the economic return, the flexibility, the production of various products with different characteristics and time gains. There are two types of extruder: single-screw and double-screw, each one has its specific properties. The solid products are introduced by means of the hopper that is equipped with a dosage pump for the regulation of the flow. Liquid products are, generally, injected in the not filled zones, through an external pump. The products undergo thermo mechanical modifications and then the shaping of the final products was done in the die. The reactive extrusion...
Tipo: Text
Palavras-chave: Extrusion réactive; Valorisation; Coproduits; Produits de la mer; Phycocolloïdes alginate; Reactive extrusion; Valorization; By-products; Sea-products; Phycocolloids; Alginate.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00500/61171/64645.pdf

Lay and scientific categorizations of new breeding techniques: Implications for food policy and genetically modified organism legislation
Provedor de dados: 5
Autores: Debucquet, Gervaise; Baron, Regis; Cardinal, Mireille.
The rapid development of new genetic breeding techniques is accompanied by a polarized debate around their risks. Research on the public perception of these techniques lags behind scientific developments. This study tests a method for revealing laypeople’s perceptions and attitudes about different genetic techniques. The objectives are to enable laypeople to understand the key principles of new genetic breeding techniques and to permit a comparison of their modes of classification with those of scientific experts. The combined method of a free sorting task and focus groups showed that the participants distinguished the techniques that did not induce any change in DNA sequence, and applied two different logics to classify the other breeding techniques: a...
Tipo: Text
Palavras-chave: Food policy; Genetically modified organism regulation; Genetically modified organisms; Lay categorization; New breeding techniques; And public understanding.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00634/74604/74979.pdf

Numerical and experimental study of a continuous electrostatic smoking process
Provedor de dados: 5
Autores: Baron, Regis; Havet, Michel; Solliec, Camille; Pierrat, Daniel; Touchard, Gerard.
The smoking process is a batch one with long duration processing (some hours). Deposition of smoke particles can be enhanced by electrostatic precipitation. However, a better knowledge of the fundamental physics is needed to optimize the process. We carried out experimental and numerical studies to obtain essential information on the smoke flow. First, experiments physically characterized the wood smoke. These measures lead us to study the turbulent two-phase flow using an algebraic slip model. The main coupling with electrical forces is taken into account through the slip velocity. Various assumptions were tested concerning the coupled phenomena in order to build an algorithm that is able to simulate these phenomena. Numerical resolutions are compared...
Tipo: Text
Palavras-chave: Smoked salmon; Smoke particles; Electrostatic precipitators.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4695.pdf

Modélisation de la contamination des bivalves par les toxines d'Alexandrium spp. Rapport final
Provedor de dados: 5
Autores: Lassus, Patrick; Amzil, Zouher; Bardouil, Michele; Baron, Regis; Bohec, Madeleine; Bougrier, Serge; Garen, Pierre; Laabir, Mohamed; Leguay, Didier; Masselin, Pierre; Truquet, Philippe; Sechet, Veronique; Bablon, Clotilde; Berard, Jean-baptiste; Carre, Camille; Cheignon, Valerie; Lecamp, Sylvain; Mabit, Marie.
L'objectif général de l'étude est de simuler les épisodes de contamination de certains bivalves (huîtres et moules) par les toxines d'Alexandrium minutum et A. calenella à partir d'un module expérimental adapté, et en vue de construire un modèle de contamination applicable à ces espèces. Ce modèle sera ensuite susceptible d'être couplé aux modèles biologiques locaux (estuaire de Penzé et étang de Thau) de déterminisme des blooms, ainsi qu'aux modèles hydrodynamiques développés par différentes équipes (Ifremer, Université de Montpellier). La première année (2001-2002) était consacrée à la simulation des contaminations en estuaire de Penzé (Alexandrium minulum) et au développement de cultures en masse d'A. calenella de Thau en bioréacteurs.
Tipo: Text
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00156/26711/24786.pdf

Optimisation d'un nouveau procédé de fumage du poisson par précipitation électrostatique des particules de fumée
Provedor de dados: 5
Autores: Baron, Regis; Sanquer, Odile; Département Sciences et Techniques Alimentaires Marines de l'IFREMER de Nantes; UMR CNRS GEPEA; CETIM; UMR LEA Univ. Poitiers.
Cette étude porte sur l'optimisation d'un nouveau procédé de fumage en continu par précipitation électrostatique des particules de fumée. Le principe est de faire circuler Ia fumée, produite par pyrolyse de bois, entre deux électrodes. Sous des conditions électriques spécifiques, un flux ionique entre les électrodes est généré.
Tipo: Text
Ano: 2006
URL: http://archimer.ifremer.fr/doc/00065/17626/15155.pdf

Etude de l'extrusion
Provedor de dados: 5
Autores: Baron, Regis.
Ce rapport fait suite au stage effectué au sein du laboratoire «Génie Alimentaire», de l'Institut Français de Recherche pour l'Exploitation de la MER. Ce stage fait partie du cycle de préparation à la Maîtrise de Sciences et Techniques en Systèmes Automatiques Industriels. Il s'est déroulé du 25 Février au 17 Mai 1991.Ce rapport porte sur l'étude du procédé d'extrusion.
Tipo: Text
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00137/24870/22958.pdf

Improving detoxification Efficiency of PSP-contaminated oysters (Crassostrea gigas Thunberg)
Provedor de dados: 5
Autores: Lassus, Patrick; Bardouil, Michele; Baron, Regis; Berard, Jean-baptiste; Masselin, Pierre; Truquet, Philippe; Pitrat, Jp.
Shellfish production, and production of marine bivalve molluscs in particular, is the main form of marine aquaculture in the European Union, with a production estimated at 1,200,000 tons in 1999 (Food and Agricultural Organization). Moreover, aquaculture production is rapidly expanding throughout Europe and is becoming a major economic resource in developing areas such as Northern Greece, Ireland, and northwestern Spain. These shellfish, mainly mussels, oysters, and clams, are produced in a natural environment. Due to variations in their environment, these otherwise edible species may however become unsafe for human consumption. Potential problems are amplified due to the nature of shellfish themselves: as they are filter feeders, they consume large...
Tipo: Text
Palavras-chave: Detoxification; PSP toxin; Toxic algae; Bioaccumulation; Contaminant; Clam; Mussel; Oyster; Shellfish culture.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-2271.pdf

Use of random forest methodology to link aroma profiles to volatile compounds: application to enzymatic hydrolysis of Atlantic salmon (Salmo salar) by-products combined with Maillard reactions
Provedor de dados: 5
Autores: Cardinal, Mireille; Chaussy, Marianne; Donnay-moreno, Claire; Cornet, Josiane; Rannou, Cecile; Fillonneau, Catherine; Prost, Carole; Baron, Regis; Courcoux, Philippe.
To use salmon protein hydrolysates as food ingredients and to mask the fish odor, Maillard reactions were associated with enzymatic production of hydrolysates. The study explored an original approach based on regression trees (RT) and random forest (RF) methodologies to predict hydrolysate odor profiles from volatile compounds. An experimental design with four factors: enzyme/substrate ratio, quantity of xylose, hydrolysis and cooking times was used to create a range of enzymatic hydrolysates. Twenty samples were submitted to a trained panel for sensory descriptions of odor. Hydrolysate volatile compounds were extracted by means of Headspace Solid Phase MicroExtraction (HS-SPME) and analyzed using gas chromatography/mass spectrometry (GC-MS). The results...
Tipo: Text
Palavras-chave: Sensory characteristics; Volatile compounds; HS-SPME/GC-MS; Regression tree; Random forest; Hydrolysate; Maillard reactions.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00624/73590/73024.pdf

Elements for optimizing a one-step enzymatic bio-refinery process of shrimp cuticles: Focus on enzymatic proteolysis screening
Provedor de dados: 5
Autores: Baron, Regis; Socol, Marius; Kaas, Raymond; Arhaliass, A.; Rodriguez Del Pino, J.; Le Roux, Karine; Donnay-moreno, Claire; Berge, Jean-pascal.
This article complements an earlier work published in 2015 Baron et al. (2015) that showed the interest of a shrimp shells bio-refining process. We compare here the effect of eleven commercial proteases at pH 3.5 or 4.0 on a residual amount of shrimp shells proteins after 6 hours at 50 °C. The two pH are obtained when respectively 40 and 25 mmol of formic acid are added to 5 g of mild dried shell. Deproteinisation yield above 95% are obtained. Residual amino acids profile in the solid phase was identical for the eleven proteases except for pepsin which was similar to the raw material profile. A significant relative increase in the proportion of Glycine is observed for the ten other cases. Likewise, shapes of size exclusion chromatograms of the dissolved...
Tipo: Text
Palavras-chave: Bio-refinery; Shrimp cuticles; Acidic enzymatic proteolysis.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00388/49957/50530.pdf

Fabrication d'un aliment piscicole frais et humide à base de captures accessoires et de coproduits de poissons
Provedor de dados: 5
Autores: Doudard, Karine; Chim, Liet; Arhaliass, Abdellah; Trintignac, Pascal; Garsi, Pierre; Legrand, Jack; Baron, Regis.
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00605/71719/70182.pdf

Valorization of the Macroalgae Sargassum Muticum by Enzymatic Hydrolysis, Interest of Surfactants to Improve the Extraction of Phlorotannins and Polysaccharides
Provedor de dados: 5
Autores: Vandanjon, Laurent; Vallet, Laurent; Le Glatin, Titouan; Deleris, Paul; Baron, Regis; Bourseau, Patrick; Dumay, Justine.
The use of surfactants to improve enzymatic hydrolysis of the macroalgae Sargassum muticum has been investigated. Visible absorption spectroscopy has been used to quantify the solubilization of both polysaccharides and phlorotannins in the hydrolysates.   After total extraction, results showed that Sargassum muticum contained 2.74% (expressed in percent of the dry weight of the algae) of phlorotannins whose 32 % were in the cell wall. This result shows that it is important to access to the parietal phlorotannins. To reach this objective, we chose the enzymatic approach for destructurating the cell wall of the algae. The use of 5% dry weight (DW - 5% by weight of hydrolyzed algae) of an enzymatic mix containing a commercial beta-glucanase, a commercial...
Tipo: Text
Palavras-chave: Brown macroalgae; Sargassum muticum; Enzymatic hydrolysis; Surfactants; Phlorotannins.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00350/46105/46073.pdf

A Physiologically Structured Equation to Consider Quota Heterogeneity in the Droop Model
Provedor de dados: 5
Autores: Mairet, Francis; Baron, Regis.
The Droop model allows to represent microalgae growth limited by a nutrient, using a cell quota (also referred to as variable-yield) approach. Single-cell measurements have revealed quota heterogeneity in phytoplankton collected from field studies. Such heterogeneity can be due, among other factors, to spatial structure (e.g. in biogeochemical cycles in the ocean, or for photobioreactors connected in series). Nonetheless, quota heterogeneity is generally omitted in modelling studies, using an average quota approach, or included in size-structured or individual-based models. Here, we propose a distributed Droop equation to tackle this problem, considering subpopulation growth -in line with Droop macroscopic view- rather than cell division dynamics. We...
Tipo: Text
Palavras-chave: Population Balance Model; Variable-yield model; Cell Quota; Phytoplankton; Microalgae.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00600/71187/69542.pdf

Gut passage times in two bivalve molluscs fed toxic microalgae: Alexandrium minutum, A-catenella and Pseudo-nitzschia calliantha
Provedor de dados: 5
Autores: Gueguen, Marielle; Lassus, Patrick; Laabir, Mohamed; Bardouil, Michele; Baron, Regis; Sechet, Veronique; Truquet, Philippe; Amzil, Zouher; Barille, Laurent.
The occurrence of new phytoplankton species in a coastal area may be explained by the import of shellfish containing whole live algal cells in their digestive tracts. Indeed, shellfish containing toxic algal cells can induce both primary contaminations in safe areas ( initially free from toxic microalgae), and secondary contaminations of other shellfish growing in the same area via the faeces of the imported animals. To mitigate this problem, shellfish need to be placed in a separate holding tank and their intestinal content purged. For a deeper understanding of the risks associated with transferring contaminated shellfish, oysters ( Crassostrea gigas) and mussels ( Mytilus edulis) were purposely fed either Alexandrium minutum or A. catenella (...
Tipo: Text
Palavras-chave: Risk assessment; Toxic phytoplankton; Uptake; Gut passage; Mytilus edulis; Crassostrea gigas.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3897.pdf

Paralytic shellfish poison outbreaks in the Penze estuary: Environmental factors affecting toxin uptake in the oyster, Crassostrea gigas
Provedor de dados: 5
Autores: Lassus, Patrick; Baron, Regis; Garen, Pierre; Truquet, Philippe; Masselin, Pierre; Bardouil, Michele; Leguay, Didier; Amzil, Zouher.
Several experiments using a self-regulated system were conducted to define the factors likely to influence the uptake of paralytic shellfish poison (PSP) by oysters in the Penze estuary (France, Brittany). Each 4-day experiment was carried out in a recirculated sea water system using 15 Pacific oysters (Crassostrea gigas) separated from each other and supplied with unfiltered natural seawater containing alternatively toxic (Alexandrium minutum) or non-toxic (Skeletonema costatum) algal diets. The food supply and exposure times to toxic diets were determined according to field studies of the Upstream and downstream movement of patches containing A. minutum. The experimental parameters corresponded roughly to the hydrological conditions generally observed in...
Tipo: Text
Palavras-chave: Experimental contamination; Oyster toxicity; Dinophyceae; Toxin; PSP.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-400.pdf

Odor Modification in Salmon Hydrolysates Using the Maillard Reaction
Provedor de dados: 5
Autores: Kouakou, Christelle; Berge, Jean-pascal; Baron, Regis; Lethuaut, Laurent; Prost, Carole; Cardinal, Mireille.
The aim of this work was to study the effect of adding sugar during proteolysis to promote the Maillard reaction and mask the initial fish odor and off-flavors generated. An experimental design, based on the Doehlert plan, was used to study the influence of hydrolysis conditions (time, temperature, sugar, and antioxidant addition) on the odor characteristics of hydrolysates, soluble protein levels, and amino acid content. Results showed that the lowest level of sugar (10g of D-xylose added to 1kg of by-products) was enough to develop a grilled odor in hydrolysates. In the hydrolysis conditions used, i.e. enzyme inactivation at 95°C for 30min, hydrolysis temperature had no effect on grilled odor production but significantly affected the soluble protein...
Tipo: Text
Palavras-chave: Salmon by-product; Hydrolysate; Maillard reaction; Sensory characteristics; Off-flavor; Soluble protein.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00156/26702/24778.pdf

Modélisation de la contamination des huîtres par les toxines d'Alexandrium minutum - Rapport final (2ème année)
Provedor de dados: 5
Autores: Lassus, Patrick; Bardouil, Michele; Baron, Regis; Garen, Pierre; Laabir, Mohamed; Leguay, Didier; Masselin, Pierre; Truquet, Philippe; Joret, Camille.
L'objectif de l'étude est de simuler les épisodes de contamination des huîtres par les toxines d'Alexandrium minufum à partir d'un module expérimental adapté, et en vue de construire un modèle de contamination applicable à cette espèce. Ce modèle sera ensuite susceptible d'être couplé au modèle biologique local (estuaire de Penzé) de déterminisme des blooms, ainsi qu'aux modèles hydrodynamiques développés par différentes équipes (Ifremer).
Tipo: Text
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00156/26712/24787.pdf

Utilisation des sous-produits de la pêche et de l'aquaculture pour l'alimentation en aquaculture
Provedor de dados: 5
Autores: Penven, Anais; Baron, Regis; Etienne, Monique; Delannoy, Charles; Berge, Jean-pascal.
Tipo: Text
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00607/71938/70635.pdf

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
Provedor de dados: 5
Autores: Baron, Regis; Vauchel, Peggy; Kaas, Raymond; Arhaliass, Abdellah; Legrand, Jack.
The context of this study is the modelling of reactive extrusion process based on an alginate extraction protocol. Residence Time Distribution (RTD) is one important part to predict the kinetics of reactive compounds. A simple model is proposed to predict RTD in fully intermeshing co-rotating twin-screw extruders without reaction. This model, which can be easily extended to reactive case in a future work, is based on the extension of an axial dispersion model, including control parameters (screw speed and flow rate) and geometrical parameters (screw profile and die design). Simulations were performed for various operating and geometrical conditions so as to illustrate possibilities offered by the proposed model. Validation was conducted for two different...
Tipo: Text
Palavras-chave: Alginate; Extraction; Extrusion; Mathematical modelling; Residence time distribution; Simulation; Laminaria digitata.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00005/11592/8985.pdf

Modelling of paralytic shellfish toxin biotransformations in the course of Crassostrea gigas detoxification kinetics
Provedor de dados: 5
Autores: Gueguen, Marielle; Baron, Regis; Bardouil, Michele; Truquet, Philippe; Haberkorn, Hansy; Lassus, Patrick; Barille, Laurent; Amzil, Zouher.
The aim of this study was to evaluate the importance of biotransformation of paralytic shellfish toxins during the detoxification process in contaminated oysters. Mathematical models based upon the detoxification patterns of digestive gland and other tissues were developed. It was demonstrated that biotransformations do not seem to play an important role in digestive gland or other tissue detoxification kinetics with our data set. Moreover, different toxin transfers from digestive gland toward other tissues were investigated. No significant transfer was highlighted in our data set. These first conclusions were drawn after comparing the results obtained from 13 biotransformations and identifiable transfer scenarios. Finally, to determine a more robust...
Tipo: Text
Palavras-chave: Detoxification kinetics modelling; Biotransformation of saxitoxin analogues; Oyster.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00049/16047/14309.pdf

Continuous fluorescence recording as a way to improve Pacific oyster (Crassostrea gigas) models of paralytic shellfish toxin accumulation
Provedor de dados: 5
Autores: Baron, Regis; Couedel, Marielle; Joret, Camille; Garen, Pierre; Truquet, Philippe; Masselin, Pierre; Bardouil, Michele; Lassus, Patrick.
A simple system was used to simulate the effect of alternating toxic (paralytic shellfish poisoning toxins) and non-toxic microalgal diets on oyster feeding behaviors and rates of toxin accumulation. These experimental conditions were meant to reflect, to some extent, the incoming and outgoing fluxes of toxic algae observed at the mouth of the Penze estuary (Northern Brittany, France). Physiological and toxicological parameters were estimated based oil fluorescence measurements recorded continuously at the outlet of each experimental tank, which contained a single oyster. Q(tox), this variable describes toxin uptake in oysters, it was used (instead of the toxin ingestion rate): i) in simple graphical analyses, ii) as well as in one- and two-compartment...
Tipo: Text
Palavras-chave: Skeletonema costatum; Alexandrium minutum; Fluorescence; Modeling; Kinetics; Toxin uptake; Shellfish toxin; PSP.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1400.pdf

First metabolomic approach of the epiphytic bacteria-marine diatom Haslea ostrearia relationships
Provedor de dados: 5
Autores: Mondeguer, Florence; Lepinay, Alexandra; Capiaux, Hervé; Turpin, Vincent; Baron, Regis; Hess, Philipp; Lebeau, Thierry; Boug,.
The marine diatom Haslea ostrearia [1] produces a water-soluble blue-pigment named marennine [2] of economic interest. But the lack of knowledge of the ecological conditions, under which this microalga develops in its natural ecosystem, more especially bacteria H. ostrearia interactions, prevents any optimization of its culture in well-controlled conditions.  The structure of the bacterial community was analyzed by PCR-TTGE before and after the isolation of H. ostrearia cells recovered from 4 localities, to distinguish the relative part of the biotope and the biocenose and eventually to describe the temporal dynamic of the structure of the bacterial community at two time-scales. The differences in genetic fingerprints, more especially high between two H....
Tipo: Text
Palavras-chave: Haslea ostrearia; Marine diatom; Co-culture microalgae; Bacterial community; PCR-TTGE; High Resolution Mass Spectrometry; Untargeted metabolomics.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00342/45367/44862.pdf

Influence of Crassostrea gigas (Thunberg) sexual maturation stage and ploidy on uptake of paralytic phycotoxins
Provedor de dados: 5
Autores: Gueguen, Marielle; Baron, Regis; Bardouil, Michele; Haberkorn, Hansy; Soudant, Philippe; Truquet, Philippe; Lassus, Patrick.
The purpose of this study was to assess paralytic phycotoxin uptake in diploid and triploid oysters at two stages of their sexual cycle corresponding to their status in early summer (June) and winter (November). Samples of diploid and triploid oysters were exposed to a toxic culture of Alexandrium minutum for 4 days in each season. No significant differences in filtration or clearance rates were observed during either November or June experiments. When diploid oysters were at resting stage (November), toxin uptake showed no significant difference between the ploidy classes. In contrast, when the diploid oysters were at the peak of their sexual maturation (June), the triploid oysters were seen to accumulate almost double the amount of paralytic toxins as...
Tipo: Text
Palavras-chave: Paralytic shellfish poisoning; Crassostrea gigas; Diploid; Triploid; Contamination.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00087/19796/17487.pdf

Manufacture of "fresh/wet" aquaculture feeds based on by-catches, fish by-products and algae
Provedor de dados: 5
Autores: Doudard, Karine; Chim, Liet; Arhaliass, Abdellah; Przybyla, Cyrille; Baron, Regis.
This work focuses on available bio resources transformation such as by-catches or fish by-products and marine plants (seaweed and microalgae) as ren circuit . The objective is to make this production as autonomous and sustainable as possible and fitted to the idea of circular economy. Thanks to previous projects, it seems that by-catches could be a plentiful source of proteins for fish. The challenge associated with this type of aquaculture formulations relies on the ability to incorporate abundant resources readily available and the significant reduction of certain energy‐consuming steps (such as drying) in order to minimize the environmental impact of a fish feed production. The adequacy of this strategy (fresh raw material and wet feed) with a...
Tipo: Text
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00456/56736/58525.pdf

Manufacture of "fresh/wet" aquaculture feeds based on marine by-product including fishing by-catches
Provedor de dados: 5
Autores: Doudard, Karine; Chim, Liet; Arhaliass, Abdellah; Trintignac, Pascal; Garsi, Pierre; Legrand, Jack; Baron, Regis.
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00605/71718/70181.pdf

Transient initial phase in continuous culture of Isochrysis galbana affinis Tahiti
Provedor de dados: 5
Autores: Bougaran, Gael; Le Dean, Loic; Lukomska, Ewa; Kaas, Raymond; Baron, Regis.
Starting microalgae continuous culture generally includes a preliminary batch culture to obtain sufficient cell density. It is possible to apply continuous regime from the beginning of the culture (IC mode) rather than to begin by an initial batch (IB mode). It is our purpose to check that both initial modes lead to identical steady-state cell characteristics. The microalga Isochrysis galbana affinis Tahiti was used for this comparative study. With an initial cell density of 5 x 10(5) cell ml(-1) and a dilution rate of about 1.0 d(-1), both IB and IC modes led to identical cell density once steady-state is reached between 6 and 8 d after inoculation in the two cases. Cell concentration of chlorophyll a and pheopigment a were found to be similar for IB and...
Tipo: Text
Palavras-chave: Isochrysis; Cell quota; Photosynthesis; Steady state; Continuous culture.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-597.pdf

Optimizing conditions for the continuous culture of Isochrysis affinis galbana relevant to commercial hatcheries
Provedor de dados: 5
Autores: Marchetti, Julie; Bougaran, Gael; Le Dean, Loic; Megrier, Cyril; Lukomska, Ewa; Kaas, Raymond; Olivo, Erell; Baron, Regis; Robert, Rene; Cadoret, Jean-paul.
Optimal culture conditions were investigated for the continuous culture of Isochrysis affinis galbana (T-Iso) by assessing the effects of irradiance, temperature, pH and nitrogen and phosphorus requirements. Assessment of the growth rate-irradiance relationship in a turbidostat experiment highlighted that an optimum irradiance efficiency for growth (E-mu) occurred at irradiance much lower than the saturating level. Furthermore, our modeling approach for productivity pointed out that an optimal set of irradiance and dilution rate could be achieved in order to maximize irradiance efficiency. Optimal conditions for growth were assessed for temperature, pH and irradiance by means of a factorial design experiment. The resulting model predicted that optimal...
Tipo: Text
Palavras-chave: Isochrysis affinis galbana; Irradiance efficiency; Factor interaction; Nutrient limitation; Microalgae cultures.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00076/18736/16465.pdf

Effect of smoking processes on the contents of 10 major phenolic compounds in smoked fillets of herring (Cuplea harengus)
Provedor de dados: 5
Autores: Serot, Thierry; Baron, Regis; Knockaert, Camille; Vallet, Jean-luc.
This study evaluated the effects of five smoking processes on the contents of 10 major phenolic compounds in fillets of herring (Cuplea harengus), namely two traditional processes, involving smoke production by smouldering or friction, one process using liquid smoke atomisation, and two electrostatic smoking processes, also involving smouldering or friction. The effects of several parameters, such as smoking time, smokehouse temperature, electrode voltage, and fish fillet temperature before smoking were assessed for each process. The results indicate that the content of phenolic compounds are strongly affected by the process applied. The percentages of phenolic compounds in fish flesh remained constant and discriminant for a given process, regardless of...
Tipo: Text
Palavras-chave: Herring; Phenolic compounds; Smoking process.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-674.pdf

Kinetic study of solid phase demineralization by weak acids in one-step enzymatic bio-refinery of shrimp cuticles
Provedor de dados: 5
Autores: Baron, Regis; Socol, Marius; Arhaliass, A.; Bruzac, Sandrine; Le Roux, Karine; Del Pino, J. Rodriguez; Berge, Jean-pascal; Kaas, Raymond.
We describe a one-step bio-refinery process for shrimp composites by-products. Its originality lies in a simple rapid (6 h) biotechnological cuticle fragmentation process that recovers all major compounds (chitins, peptides and minerals in particular calcium). The process consists of a controlled exogenous enzymatic proteolysis in a food-grade acidic medium allowing chitin purification (solid phase), and recovery of peptides and minerals (liquid phase). At a pH of between 3.5 and 4, protease activity is effective, and peptides are preserved. Solid phase demineralization kinetics were followed for phosphoric, hydrochloric, acetic, formic and citric acids with pKa ranging from 2.1 to 4.76. Formic acid met the initial aim of (i) 99 % of demineralization yield...
Tipo: Text
Palavras-chave: Bio-refinery; Acidic enzymatic proteolysis; Shrimp cuticles; Demineralization kinetics and modeling.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00281/39244/37809.pdf

Kinetics modeling of alginate alkaline extraction from Laminaria digitata
Provedor de dados: 5
Autores: Vauchel, Peggy; Le Roux, Karine; Kaas, Raymond; Arhaliass, Abdellah; Baron, Regis; Legrand, Jack.
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...
Tipo: Text
Palavras-chave: Model; Laminaria digitata; Alkaline extraction kinetics; Alginate.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6315.pdf

A New Process for Extracting Alginates from Laminaria digitata: Reactive Extrusion
Provedor de dados: 5
Autores: Vauchel, Peggy; Kaas, Raymond; Arhaliass, Abdellah; Baron, Regis; Legrand, Julien.
Alginates are natural polysaccharides that are extracted from brown seaweeds and widely used for their rheological properties. The main step in the extraction protocol used in the alginate industry is that of alkaline extraction. A batch process is used for this step, which is time-, water-, and reactant-consuming. The possibility of extracting by reactive extrusion was investigated. The reactive extrusion process appeared to be more efficient than the batch process for the alkaline extraction of alginates from Laminaria digitata in several key ways: Time demand is reduced from about an hour to only few minutes, water and reactant requirements are divided by more than a factor 2, extraction yield is 15% higher (relative enhancement), and the rheological...
Tipo: Text
Palavras-chave: Intrinsic viscosity; Reactive extrusion; Laminaria digitata; Alkaline extraction; Alginate.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6255.pdf

Influence of temperature, pH and NaCl concentration on the maximal growth rate of Brochothrix thermosphacta and a bioprotective bacteria Lactococcus piscium CNCM I-4031
Provedor de dados: 5
Autores: Leroi, Francoise; Fall, Papa-abdoulaye; Pilet, Marie-france; Chevalier, Frederique; Baron, Regis.
The maximum specific growth rate (μmax) of Brochothrix thermosphacta, a spoilage bacteria of cooked peeled shrimp, and Lactococcus piscium CNCM I-4031, a bioprotective strain, was investigated under different conditions of temperature, NaCl concentrations and pH. The basic modelling approach used was the Gamma concept (γ-concept) and the model developed was then adapted to shrimp. Cardinal growth parameters were quite similar for the two strains, except for NaCl. No NaCl was required for growth and the NaClmax was three-times higher for B. thermosphacta than for L. piscium (62 and 23 g l−1 respectively). However, tolerance to NaCl was higher in seafood than in liquid broth, possibly due to presence of osmoltically active molecules. L. piscium and B....
Tipo: Text
Palavras-chave: Modelling; Biopreservation; Shrimp; Lactic acid bacteria; Brochothrix thermosphacta; Spoilage bacteria; Environmental conditions.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00083/19473/17088.pdf

Etude numérique de la répartition de fumée dans une enceinte de fumage industrielle. Rapport final
Provedor de dados: 5
Autores: Havet, Michel; Baron, Regis; Le Niliot, Anne.
Le laboratoire Génie Alimentaire de l'IFREMER travaille depuis quelques années sur le procédé de fumage en utilisant1 une enceinte climatisée industrielle. Pour optimiser ce procédé afin d'en tirer le meilleur partie pour nos différentes recherches, il est apparu indispensable de modéliser et simuler l'écoulement des particules de fumée. Ce travail nécessite, à la fois, un recherche bibliographique critique très pointue et un travail de simulation avec des outils logiciels (code de calcul CFD) sophistiqués. Ne disposant pas des moyens nécessaires en interne, le laboratoire a donc choisi de contractualisé cette tâche avec l'ENITIAA.
Tipo: Text
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00134/24521/22550.pdf

COSELMAR. Compréhension des socio-écosystèmes littoraux et marins pour la prévention et la gestion des risques. Bilan scientifique 2013-2017
Provedor de dados: 5
Autores: Pardo, Sophie; Hess, Philipp; Simon, Elodie; Barille, Laurent; Geslin, Emmanuelle; Cognie, Bruno; Martin-jezequel, Véronique; Sechet, Véronique; Herrenknecht, Christine; Baron, Regis; Bourseau, Patrick; Amzil, Zouher; Masse, Anthony; Vandanjon, Laurent; Dumay, Justine; Lebeau, Thierry; Turpin, Vincent; Mondeguer, Florence; Petitgas, Pierre; Trouillet, Brice; Mercier, Denis; Guillotreau, Patrice; Guineberteau, Thierry; Mahevas, Stephanie; Schoefs, Franck; Sophie Pardo; Philipp Hess; Pauline Borgniet; Laurent Barillé; Emmanuelle Geslin; Bruno Cognie; Véronique Martin-Jezequel; Véronique Sechet; Christine Herrenknecht; Régis Baron; Patrick Bourseau; Zouher Amzil; Anthony Massé; Laurent Vandanjon; Justine Dumay; Thierry Lebeau; Vincent Turpin; Florence Mondeguer; Pierre Petitgas; Brice Trouillet.
COSELMAR, a 4-year project financed by the Région des Pays de la Loire at 2.1 M€, officially started on the 7th January 2013. The project is coordinated by Philipp Hess (IFREMER) and Sophie Pardo (Université de Nantes-LEMNA) and falls under the Federation for Research Institut Universitaire Mer et Littoral (IUML, FR CNRS 3473)*. COSELMAR has also been approved by the Scientific Council of the MSH Ange Guépin. COSELMAR is a research project uniting 5 research units of IFREMER and 11 laboratories of the Université de Nantes, along with academic partners, and national and international industries. The aim is to achieve a better understanding of the marine and coastal ecosystems and the associated resources. The project will also provide insights into risk...
Tipo: Text
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00406/51793/52550.pdf

Effects of the smoking process on odour characteristics of smoked herring (Clupea harengus) and relationships with phenolic compound content
Provedor de dados: 5
Autores: Cardinal, Mireille; Cornet, Josiane; Serot, Thierry; Baron, Regis.
The relationship between smoking parameters and odour characteristics, evaluated by a trained sensory panel.. were studied on smoked herring. In addition, a possible correlation between the content of 10 phenolic compounds and sensory perceptions was investigated. Five smoking techniques were applied, combining smoke production conditions, performed by pyrolysis of beech wood sawdust or by friction of beech wood log, with smoke deposition, either in a controlled kiln (traditional smoking) or by an electrostatic process. In the fifth smoking technique, a purified condensate of beech smokes was vaporised on fish fillets in the smokehouse. The time of smoking was 3 It for traditional smoking and the liquid smoke atomisation process and 12 min for the...
Tipo: Text
Palavras-chave: Odour characteristics; Sensory evaluation; Phenolic compounds; Smoking; Herring.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-827.pdf

Comparative Value of a Sorting Procedure and Quantitative Descriptive Analysis to Investigate the Influence of Processing Parameters: Case Study of Hydrolysate Production From Salmon By-Products
Provedor de dados: 5
Autores: Cardinal, Mireille; Baron, Regis; Kouakou, Christelle; Prost, Carole; Courcoux, Philippe.
Many papers have recently discussed the value of a free sorting method as a rapid and simple alternative to quantitative descriptive analysis, considered the reference tool for food sensorial characterization. The aim of the present paper is to evaluate whether this method of free sorting can also be used to investigate the influence of processing parameters. An experimental design was applied to production conditions of enzymatic hydrolysates from salmon by-products. The effect of four processing parameters (time and temperature of hydrolysis, sugar and antioxidant addition) on the odor of the hydrolysates was studied using a sorting task with 45 untrained panelists and a quantitative descriptive analysis carried out with 11 trained panelists. This study...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00179/29051/27488.pdf

First insight on interactions between bacteria and the marine diatom Haslea ostrearia : Algal growth and metabolomic fingerprinting
Provedor de dados: 5
Autores: Lepinay, Alexandra; Turpin, Vincent; Mondeguer, Florence; Grandet-marchant, Quentin; Capiaux, Herve; Baron, Regis; Lebeau, Thierry.
A first insight on the interactions between bacteria isolated from monospecific cultures of the marine diatom Haslea ostrearia and this microalgae is described in this work. From 28 bacterial isolates, the maximal growth rate and the maximal cell concentration were on average 58% and 27% higher (max. 67% for isolate B22). Isolates B5, B10 (both Saccharospirillum sp.) and B22 (Rhodobacter sp.) were the most efficient. The geographical origin of H. ostrearia from which bacteria were isolated had no impact on the algal growth performances, and a given bacterial isolate led to the same algal growth irrespective of the geographical origin of H. ostrearia. To explain the results obtained, a comprehensive integrative strategy was conducted that analyzed the...
Tipo: Text
Palavras-chave: Bacterial selection; Plant-growth-promoting bacteria; Phycosphere; Metabolomics.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00429/54036/55340.pdf

Soft liquefaction of the red seaweed Grateloupia turuturu Yamada by ultrasound-assisted enzymatic hydrolysis process
Provedor de dados: 5
Autores: Le Guillard, Cecile; Berge, Jean-pascal; Donnay-moreno, Claire; Bruzac, Sandrine; Ragon, Jean-yves; Baron, Regis; Fleurence, Joel; Dumay, Justine.
Ultrasound-assisted enzymatic hydrolysis is a recent process, increasingly employed for plant biomass liquefaction and the recovery of soluble biomolecules. However, to our knowledge, it has never been used on seaweeds, particularly wet ones. The aim of this study was to compare the efficiency of three processes on the liquefaction of the red seaweed Grateloupia turuturu Yamada: enzyme-assisted extraction (EAE), ultrasound-assisted extraction (UAE), and their combination, ultrasound-assisted enzymatic hydrolysis (UAEH). These comparisons will allow the identification as to which process achieves the highest extraction yield of water-soluble compounds. For this purpose, experiments were conducted at 40 °C for 6 h using an enzymatic cocktail of four...
Tipo: Text
Palavras-chave: Ultrasound-assisted enzymatic hydrolysis; Enzymatic hydrolysis; Ultrasound; Liquefaction; Algae; Grateloupia turuturu.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00308/41877/44316.pdf

Decrease in dynamic viscosity and average molecular weight of alginate from Laminaria digitata during alkaline extraction
Provedor de dados: 5
Autores: Vauchel, Peggy; Arhaliass, Abdellah; Legrand, Jack; Kaas, Raymond; Baron, Regis.
Alginates are natural polysaccharides that are extracted from brown seaweeds and widely used for their rheological properties. The central step in the extraction protocol used in the alginate industry is the alkaline extraction, which requires several hours. In this study, a significant decrease in alginate dynamic viscosity was observed after 2 h of alkaline treatment. Intrinsic viscosity and average molecular weight of alginates from alkaline extractions 1-4 h in duration were determined, indicating depolymerization of alginates: average molecular weight decreased significantly during the extraction, falling by a factor of 5 between 1 and 4 h of extraction. These results suggested that reducing extraction time could enable preserving the rheological...
Tipo: Text
Palavras-chave: Laminaria digitata; Intrinsic viscosity; Depolymerization; Average molecular weight; Alkaline extraction; Alginate.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4060.pdf

Modelling the accumulation of PSP toxins in Thau Lagoon oysters (Crassostrea gigas) from trials using mixed cultures of Alexandrium catenella and Thalassiosira weissflogii
Provedor de dados: 5
Autores: Lassus, Patrick; Amzil, Zouher; Baron, Regis; Sechet, Veronique; Barille, Laurent; Abadie, Eric; Bardouil, Michele; Sibat, Manoella; Truquet, Philippe; Berard, Jean-baptiste; Gueguen, Marielle.
In October and November 2003 a bloom of the toxic dinoflagellate Alexandrium catenella was observed in the North-east zone of Thau lagoon (French Mediterranean coast). Sea water samples were collected every hours to evaluate time-related variations of phytoplankton concentrations and to compare the relative ratio of A. catenella versus other phytoplankton species during the outbreak. From these observations, trials using recirculated sea water systems were performed to: i) evaluate the physiological effects on oyster of increasing proportions of A. catenella within a mixed microalgal diet where the non-toxic diatom Thalassiosira weissflogii was present at concentration: 1500 cells ml(-1), ii) compare the effect of two temperatures (12 degrees C and 18...
Tipo: Text
Palavras-chave: Mediterranean Sea; Alexandrium catenella; Toxin content; Model; Crassostrea gigas; Paralytic shellfish poisoning.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2624.pdf

Detoxification of Pacific oyster Crassostrea gigas fed on diets of Skeletonema costatum with and without silt, following PSP contamination by Alexandrium minutum
Provedor de dados: 5
Autores: Gueguen, Marielle; Bardouil, Michele; Baron, Regis; Lassus, Patrick; Truquet, Philippe; Massardier, Julie; Amzil, Zouher.
Contamination of shellfish by paralytic shellfish poisoning ( PSP) toxins poses an economic threat to shellfish farmers. As contaminated shellfish cannot be harvested for long periods of time, it would be very useful to develop processes to optimise and shorten their detoxification. In this study, Pacific oysters Crassostrea gigas were first experimentally contaminated over a period of 13 days with a continuous flow of toxic Alexandrium minutum cultures at concentrations ranging from 150 to 200 cell ml(-1) ( toxin content after 13 days of contamination 438 mu g STX equiv. 100 g(-1) wet weight). Then, two different detoxification treatments were tested and showed detoxification rates greater than those observed in coastal environments. The first treatment...
Tipo: Text
Palavras-chave: Alexandrium minutum; Crassostrea gigas; Detoxification; Inorganic matter; Organic matter; PSP; Paralytic shellfish poisoning.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3896.pdf

Bacterial community structure of the marine diatom Haslea ostrearia
Provedor de dados: 5
Autores: Lepinay, Alexandra; Capiaux, Hervé; Turpin, Vincent; Mondeguer, Florence; Baron, Regis; Lebeau, Thierry.
The marine diatom Haslea ostrearia produces a water-soluble blue-pigment named marennine of economic interest (e.g. in aquaculture for the greening of oysters). Up to date the studies devoted to ecological conditions under which this microalga develops never took into account the bacterial-H. ostrearia relationships.  In this study the bacterial community was analysed by PCR-TTGE before and after H. ostrearia isolation cells recovered from 4 localities, to distinguish the relative part of the biotope and the biocenose and eventually to describe the temporal dynamic of the structure of the bacterial community. The bacterial structure of the phycosphere differed strongly from that of the bulk sediment. The similarity between bacteria recovered from the...
Tipo: Text
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00342/45365/44861.pdf