Consulta: subjectFacets:"Acide okadaïque"
Registros recuperados: 9
Data/hora: 04/06/2024 15:01:37

Évaluation d’une suite de bio-essais pour la détection et l’étude de composés lipophiles de micro-organismes marins issus de mollusques bivalves et de leur environnement
Provedor de dados: 5
Autores: Geiger, Marie.
The context of this study was the assessment of the safety of edible bivalve molluscs. Bivalve can indeed accumulate high concentrations of phycotoxins into their hepatopancreas, potentially leading to human intoxication outbreaks after consumption of such contaminated bivalves. In order to ensure the protection of shellfish consumers, regulated toxins are monitored using physico-chemical techniques. In parallel, emerging toxins, that can be putatively produced by microalgae or marine fungi, are monitored using the intraperitoneal mouse bioassay. However, this bioassay suffers ethical and methodological drawbacks. Thus, the objective of this work was to assess the ability of a bioassay suite to detect lipophilic toxins. This suite was composed of three...
Tipo: Text
Palavras-chave: Cytotoxicité; Larves de diptères; Activité antibactérienne; Toxines lipophiles; Micro-algues; Dinoflagellés; Micromycètes; Penicillium; Acide okadaïque; Azaspiracide; Pinnatoxine G; Vulcanodinium rugosum; Prorocentrum lima; Azadinium spinosum; Beauveria brongniartii; Cytotoxicity; Diptera larvae; Antibacterial activity; Lipophilic toxins; Microalgae; Dinoflagellates; Marine fungi; Penicillium; Okadaic acid; Azaspiracid; Pinnatoxin G; Vulcanodinium rugosum; Azadinium spinosum; Prorocentrum lima; Beauveria brongniartii.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00183/29426/27787.pdf

Un nouvel outil dans l'identification et la quantification des dinophysistoxines (DTXs) : le couplage Chromatographie Liquide Haute Performance / Spectrométrie de masse par piégeage d'ions quadripôlaire et interface d'électro- nébulisation (CLHP/SM2)
Provedor de dados: 5
Autores: Mondeguer, Florence.
This report presents a new method for detection and confirmed quantification of dinophysistoxins (DTXs) using high-performance liquid chromatography coupled to mass spectrometry with an ion trap and électrospray interface (HPLC/ESI/MS2).  The parameters of the ESI source and ion trap spectrum analyser were optimised to provide detection of DTXs with maximum sensitivity. These improvements were obtained after reverse-phase separation on a C18 column, with a first elution to 0.1% TFA (75:25, v/v) in isocratic acetonitrile/water mode without flow split at a column flow rate of 200 µl/min for 15 min. A second elution gradient step was added to allow optimised processing of long series of analyses without signal obstruction. This method was validated...
Tipo: Text
Palavras-chave: Intoxication par les coquillages; Dinophysistoxines; Acide okadaïque; Dinophysistoxine-1; Couplage CLHP-électronébulisation- SM2 par piège d'ions; Toxines.; Shellfish poisoning; Dinophysistoxines; Okadaïque Acid; Dinophysistoxine-1; Liquid Chromatography coupled Ion Trap; Toxins.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00136/24763/22839.pdf

COLNACOQ. Composés lipophiles naturels dans l’environnement des coquillages. Rapport final
Provedor de dados: 5
Autores: Hess, Philipp; Geiger, Marie; Brochard, Solène; Lepretre, Thomas; Fessard, Valerie; Antignac, Jean-philippe; Dupont, Jacques; Sechet, Veronique; Vanel, Faustine; Mondeguer, Florence; Herve, Fabienne; Leborgne, Sabrina; Deslanglois, Gwenaëlle; Marshall, Lindsey; Rounds, Lucy; Guitton, Yann; Amzil, Zouher; Grovel, Olivier; Ruiz, Nicolas; Pouchus, Francois.
Cette étude s’est inscrite dans un contexte d’évaluation de la salubrité des mollusques bivalves destinés à la consommation humaine. Ces organismes peuvent en effet accumuler des toxines, en particulier de microalgues, en concentrations importantes, pouvant induire des intoxications chez les personnes les consommant. Afin d’assurer la protection des consommateurs, les toxines réglementées sont recherchées dans les coquillages par techniques physico-chimiques. En parallèle, les toxines émergentes, potentiellement produites par d’autres organismes que les micro-algues telles que les micromycètes, peuvent être detectées par l’utilisation du test de toxicité aigüe sur souris. Cependant, ce bio-essai présente de très nombreux inconvénients, notamment éthiques...
Tipo: Text
Palavras-chave: Cytotoxicité; Toxicité sur larves de diptères; Activité antibactérienne; Bactéries marines; Toxines lipophiles; Micro-algues; Dinoflagellés; Micromycètes; Penicillium; Acide okadaïque; Azaspiracide; Pinnatoxine G; Vulcanodinium rugosum; Prorocentrum lima; Azadinium spinosum; Beauveria brongniartii.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00253/36470/35015.pdf

Cytodétection des phycotoxines diarrhéiques - Une alternative au test de toxicité aiguë sur souris pour la surveillance de la salubrité des coquillages
Provedor de dados: 5
Autores: Amzil, Zouher.
The cytodetection test of diarrheic phycotoxin KB-cells (DRAME test) was developed to ultimately provide a substitute for the acute toxicity mouse-test currently used by IFREMER's phytoplankton monitoring network (REPHY). The cyctodetection test relies on the cell morphological changes induced by the phosphorylation of cytoskeleton proteins resulting from the inhibition of cell protein-phosphatases by okadaic-type toxins. The method is specific, sensitive and fast with results given on the same day. In addition, the method has been shown to produce a good correlation with the acute toxicity mouse-test as weil as with HPLC analyses of diarrheic phycotoxins. The cytodetection test was awarded the only Special Prize of the Jury at the 6th AMAL THEE Awards...
Tipo: Text
Palavras-chave: Acide okadaïque; Inhibition des protéines phosphatases; Cytodétection; Cellules KB; Okadaic acid; Inhibition of protein-phosphatase; Cytodeteciton KB-cells.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00156/26730/24811.pdf

Imagerie par spectrométrie de masse de l’accumulation d’acide okadaïque dans la glande digestive de la moule
Provedor de dados: 5
Autores: Sam Lone, Anais.
Among the applications that facilitate the study of functional processes in living systems, measurement of the spatial distribution of molecules in biological tissues is currently available. Thus, in the field of human health, this application which targets the molecular distributions of altered tissues can be used, for example, in the diagnosis of diseases such as cancers, Alzheimer's disease, muscular myopathy, but also to recognize the distribution of drugs in animal tissues. The principle of imaging by mass spectrometry is to produce a mapping of the surface of a section of tissue, recording at each point a mass spectrum. All these spectra reconstitute so many "ion density maps", called images, that there are peaks of biological interest in the...
Tipo: Text
Palavras-chave: Imagerie par spectrométrie de masse; MALDI-TOF; TOF-SIMS; Acide okadaïque; Glande digestive; Mytilus edulis; Imaging by mass spectrometry; MALDI-TOF; TOF-SIMS; Okadaic acid; Digestive Gland; Mytilus edulis.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00360/47167/47190.pdf

Bassins insubmersibles et contamination par les micro-algues toxiques (BICMAT)
Provedor de dados: 5
Autores: Derrien, Amelie; Terre Terrillon, Aouregan; Duval, Audrey; Lebrun, Luc; Doner, Anne; Rovillon, Georges-augustin; Amzil, Zouher; Le Bec, Claude.
En cas de fermeture de zone de production pour cause de présence d'une espèce de micro algues toxique, une mesure prévoit pour les professionnels de la conchyliculture l'interdiction générale d'utilisation de l'eau de mer déjà pompée dans un bassin insubmersible. C'est dans ce contexte que la DGAL a sollicité l'appui du LER BO pour la mise en place d'une étude dans des conditions professionnelles. Cette étude vise à déterminer d'il existe un risque de contamination lors de l'immersion de coquillages non contaminés dans un bassun insubmersible rempli en eau de mer pompée dans une zone fermée pour cause de présence de micro-algues toxiques. Entre fin juin et début juillet, la présence de Dinophysis sp a entraîné la fermeture de la baie de Concarneau. Des...
Tipo: Text
Palavras-chave: Dinophysis; Toxines lipophiles; Acide okadaïque; Yessotoxines; Bassin insubmersible; Huîtres; Moules.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00486/59736/62831.pdf

Modélisation de la détoxication de mollusques bivalves contenant des phycotoxines paralysantes ou diarrhéiques
Provedor de dados: 5
Autores: Gueguen, Marielle.
The purpose of this study is to implement models to describe detoxification kinetics of Pacific oysters Crassostrea gigas and Blue mussels Mytilus edulis containing paralytic and diarrheic phycotoxins respectively. First, experimental trials made it possible to complement data from the literature regarding the understanding of processes involved in mollusc detoxification. In particular, they pointed out a difference in the mollusc capacity to degrade cellwalls of phycotoxin-producing dinoflagellates, according to their en cystement capacities. It was observed that paralytic phycotoxins reached the various oyster tissues whereas diarrheic toxins were mainly sequestred in the digestive gland of mussels. The latter seem to be retained by lysosomes localized...
Tipo: Text
Palavras-chave: Modélisation; Mytilus edulis; Crassostrea gigas; Phycotoxines; Détoxication; Acide okadaïque; Toxines paralysantes; Modelling; Mytilus edulis; Crassostrea gigas; Phycotoxins; Detoxification; Okadaix acid; Paralytic toxin.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00003/11473/8032.pdf

Etude de pré-validation du test de cytodétection des toxines diarrhéiques (acide okadaïque) dans les coquillages contaminés
Provedor de dados: 5
Autores: Le Gal, Dominique; Marcaillou-le Baut, Claire.
A cytodetection test of diarrhoeic phycotoxins was developped by both IFREMER and Nantes University. Its principle is based on cell morphological changes of KB strain, induced by inhibition of protein-phosphatases involved in cytoskeleton building. This test has been shown sensitive, fast and specific for protein phosphatase inhibitors like diarrhoeic toxins (specialy okadaic acid in France). It shows a high repeatability and reproducibility with pure toxin for the cell strain is highly stable (minimal active concentration or MAC = 125 ng OA.ml-1) In order to evaluate the efficiency oftransfering.the method to coastallaboratories, the assay was subjected to a prevalidation study. The sampling, consisting of five species of shellfish, was carried out during...
Tipo: Text
Palavras-chave: Phycotoxine; Acide okadaïque; Test de cytodétection; Prévalidation; Phycotoxin; Okadaïc acid; Cytodetection assay; Prevalidation.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00138/24909/23002.pdf

Validation d’un procédé automatisé d’extraction sur phase solide de glandes digestives de moules pour l’identification et la quantification des dinophysistoxines en LC/ESI/SM2 par piégeage d’ions quadripolaire
Provedor de dados: 5
Autores: Mondeguer, Florence; Mestres, Gilberte; Rouland, Caroline; Montagu, Monique; Maillols, Hélène.
This report presents a new extraction method of the dinophysistoxins (DTXs), confirmed by quantification using high-performance liquid chromatography coupled to mass spectrometry with an ion trap and electro spray interface (HPLC/ESI/MS2). The method originality consists on the adaptation of DTXs basic extraction procedure (liquid/ liquid) to a solid phase extraction (SPE) via a robotic station: ASPEC XLi The parameters of the automatization procedure were optimized to obtain the best DTXs recovery rate. These improvements were loaded with digestive gland mussel homogenat realized on a silica cartridge SPE, activated in hexane/chloroform (50:50), washed with hexane/chloroform (50:50) and extracted by an elution gradient (chloroform methanol (65:35) and...
Tipo: Text
Palavras-chave: Toxines; Intoxication des coquillages; Dinophysistoxines; Acide okadaïque; Dinophysistoxine-1; Méthode alternative; Extraction sur phase solide; Automatisation; Couplage CLHP/ESI/SM2 par piège d’ions.; Toxins; Shellfish poisoning; Dinophysistoxins; Okadaic acid; Dinophysistoxin-1; Alternative method; Solid phase extraction; Automation; Liquid chromatography coupled ion trap.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00342/45270/44724.pdf