Consulta: subjectFacets:"Ovatoxins"
Registros recuperados: 4
Data/hora: 06/06/2024 03:54:39

Ostreopsis cf. ovata (Dinophyceae) Molecular Phylogeny, Morphology, and Detection of Ovatoxins in Strains and Field Samples from Brazil
Provedor de dados: 5
Autores: Nascimento, Silvia M; Neves, Raquel Af; De'Carli, Gabriela Al; Borsato, Geovanna T; Da Silva, Rodrigo Af; Melo, Guilherme A; De Morais, Agatha M; Cockell, Thais C; Fraga, Santiago; Menezes-salgueiro, Adriana D; Mafra, Luis L Jr; Hess, Philipp; Salgueiro, Fabiano.
Recurrent blooms of Ostreopsis cf. ovata have been reported in Brazil and the Mediterranean Sea with associated ecological, and in the latter case, health impacts. Molecular data based on the D1–D3 and D8–D10 regions of the LSU rDNA and ITS loci, and the morphology of O. cf. ovata isolates and field populations from locations along the Brazilian tropical and subtropical coastal regions and three oceanic islands are presented. Additional ITS sequences from three single cells from the tropical coast are provided. Toxin profiles and quantities of PLTX and their analogues; OVTXs; contained in cells from two clonal cultures and two field blooms from Rio de Janeiro were investigated. Morphology was examined using both light and epifluorescence microscopy....
Tipo: Text
Palavras-chave: Benthic dinoflagellates; Harmful algal blooms; Ovatoxins; Taxonomy; Morphometry.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00604/71594/70026.pdf

Toxin content of Ostreopsis cf. ovata depends on bloom phases, depth and macroalgal substrate in the NW Mediterranean Sea
Provedor de dados: 5
Autores: Gémin, Marin-pierre; Réveillon, Damien; Hervé, Fabienne; Pavaux, Anne-sophie; Tharaud, Maxime; Séchet, Veronique; Bertrand, Samuel; Lemée, Rodolphe; Amzil, Zouher.
Over the last fifteen years, blooms of the genus Ostreopsis have been reported more frequently and at higher abundances in the Mediterranean area. Ostreopsis cf. ovata is known to produce ovatoxins (OVTXs), structural analogues of palytoxin, which is one of the most potent non-polymeric toxins. However, the production of OVTXs is poorly characterized in situ. The present study focuses on toxin content and profile according to the bloom phase during summer 2017 in Villefranche-sur-Mer, France (NW Mediterranean Sea), depth (from 0.5 to 5 m) and three different macroalgal substrates of this epiphytic dinoflagellate (Padina pavonica, Dictyota spp. and Halopteris scoparia). Ovatoxin quantification of all samples was performed by liquid chromatography coupled to...
Tipo: Text
Palavras-chave: Dinoflagellate; Benthic HABs; Ostreopsis cf. ovata; Ovatoxins; Mediterranean Sea.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00614/72566/74835.pdf

Ovatoxines: Purification à partir d’Ostreopsis cf. ovata en culture et niveaux d’accumulation dans les produits de la mer
Provedor de dados: 5
Autores: Brissard, Charline.
Dinoflagellates of genus Ostreopsis are known in tropical areas to provoke food intoxication, after palytoxin accumulation in seafood. Probably in link with climatic changes, Ostreopsis sp. is increasingly present in French Mediterranean since 2006. In the context of the PhD, the studies in natural environment, in summer 2011 and 2012, showed that: i) Ostreopsis cf. ovata strain presented a complex toxinic profile, including palytoxin and especially ovatoxins (OVTX-a, -b, c, -d, -e). A new analog (OVTX-h) was detected; ii) cell and toxinic concentrations decreased with depth; iii) different seafood accumulated toxins, which could represent real risk for bathers and consumers. Because there are no standards for OVTXs, one of the PhD goals was to develop a...
Tipo: Text
Palavras-chave: Ostreopsis ovata; Ovatoxines; Purification; Contamination des produits de la mer; Chromatographie liquide/spectrométrie de masse.; Ostreopsis ovata; Ovatoxins; Purification; Seafood contamination; Liquid chromatography / mass spectrometry.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00255/36613/35179.pdf

Characterization of ovatoxin-h, a new ovatoxin analog, and evaluation of chromatographic columns for ovatoxin analysis and purification
Provedor de dados: 5
Autores: Brissard, Charline; Herve, Fabienne; Sibat, Manoella; Sechet, Veronique; Hess, Philipp; Amzil, Zouher; Herrenknecht, Christine.
The presence of Ostreopsis cf. ovata on the Mediterranean coast represents a serious concern to human health due to production of toxins–putative palytoxin and ovatoxins (ovatoxin-a, -b, -c, -d, -e, -f and -g). However, purified ovatoxins are not widely available and their toxicities are still unknown. In the present study, we report on HR LC-MS/MS analysis of a French Ostreopsis cf. ovata strain (IFR-OST-0.3 V) collected at Villefranche-sur-Mer (France) during a bloom in 2011. Investigation of this strain of Ostreopsis cf. ovata cultivated in our laboratory by ultra-high performance liquid chromatography coupled to high resolution mass spectrometry (UHPLC-HRMS) confirmed the production of ovatoxins -a to–e and revealed the presence of a new ovatoxin...
Tipo: Text
Palavras-chave: Ostreopsis cf. ovata; Palytoxin; Ovatoxins; U-HPLC/HR-MSn; Chromatographic separation.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00252/36302/34831.pdf