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Título

Experimental approach to understand aerosolization mechanisms of toxins produced by the microalga Ostreopsis cf. ovata

AutorMedina-Pérez, Noemí Inmaculada CSIC ORCID; Dall'Osto, Manuel CSIC ORCID CVN ; Decesari, S.; Paglione, Marco; Moyano, Encarnación; Berdalet, Elisa CSIC ORCID
Fecha de publicación3-may-2020
EditorSociety of Environmental Toxicology and Chemistry
CitaciónSETAC Europe 30th Annual Meeting (2020)
ResumenBlooms of the benthic dinoflagellate Ostreopsis cf. ovata have been related to mild but acute respiratory symptoms on people exposed to marine aerosols in some Mediterranean and Brazilian beaches. These disorders have been attributed -but not proven yet- to palytoxin (PLTX) analogues (ovatoxins -OVTX- and isobaric palytoxin -isoPLTX-) produced by Ostreopsis. However, these compounds have been seldom found in the aerosol and when detected it was not associated to human health impacts. To shed light on the mechanisms of toxin production and transfer to the atmosphere five laboratory experiments were run using an aerosol generation tank with microbial communities obtained during the peak of an Ostreopsis bloom. Seawater and aerosol samples were analyzed for i) toxin concentration (with an UHPLC system coupled to a Q-Exactive Orbitrap Fourier-Transform Mass Spectrometer (FTMS) equipped with a heated-electrospray ionization source (H-ESI) operating in positive ion mode using a Hypersil GOLDTM C18 column (100 mm x 2.1 mm id., 1.9 µm particle size) packed with totally-porous silica particles, under a gradient elution of acetonitrile:water (0.1% formic acid) mobile phase), and ii) offline spectroscopic analysis performed by nuclear magnetic resonance (NMR). Toxins were detected in seawater samples and in atmospheric aerosol generated in all experiments. Unexpectedly, higher toxin concentrations (49-69 pg·Lair¿1) were found in the aerosols generated by bubbling relatively low Ostreopsis cells abundances and toxins in the water (respectively, ca. 105 cells·L¿1, 4 x 106 pg·Lwater¿1), compared to the ones (3-4 pg·Lair¿1) obtained on higher biomass abundance experiments (1 x 106 cells·L¿1 and 2 x 108 pg·Lwater¿1, respectively). The toxin profile in the air contained OVTX-a and b only, while other forms (OVTX-c, d, e and isoPLTX) were also present in the water. Moreover, NMR analysis showed different composition of the particulate organic carbon in the water (Ostreopsis cells and accompanying microbiota) and bubble bursting aerosols, suggesting selectively transfers of organic compounds from seawater into the atmosphere. High foam content was also observed in the water surface of the tank. Overall, these experiments constitute a first step to understand the ecophysiogical microalgae responses to bubble bursting as well as the complex air-sea dynamics in the surface microlayer likely regulating aerosol production and diffusion of the marine toxins in the atmosphere
DescripciónSociety of Environmental Toxicology and Chemistry (SETAC) Europe 30th Annual Meeting, 3-7 May 2020
URIhttp://hdl.handle.net/10261/244815
Aparece en las colecciones: (ICM) Comunicaciones congresos




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