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Toxicity of TIO2 nanoparticles and bulk in freshwater and marine microalgae, under visible light and UV-A-radiation

AuthorsSendra, Marta ; Moreno-Garrido, Ignacio ; Yeste, María Pilar; Gatica, José Manuel; Blasco, Julián
Issue DateSep-2016
Citation30th ESCPB Congress (2016)
AbstractTitanium dioxide nanoparticles (TiO2 NPs) has become a part of our daily life in the form of drug delivery systems, therapeutics and biosensors, cosmetics, production of paints, coatings, plastics, skin care products, foods, water remediation devices and pharmaceuticals, and the predicted environmental concentrations are the highest in aquatic ecosystems. Although TiO2 has got a limited reactivity, under UV-A radiation can increase adverse effects on organisms, due to its photocatalytic properties; and the occurrence at nanoscale level change its physicochemical properties and toxicity. Phytoplankton is a key trophic level in aquatic ecosystems, and the toxicity provoked by these nanoparticles can affect structure and function of the ecosystems. Two microalgae species, from freshwater (Chlamydomonas reinhardtii) and seawater (Phaeodactylum tricornutum) have been selected for testing toxicity of TiO2 NPs and TiO2 bulk form. Due to their photo-catalytic properties, UV-A effect was checked, also. TiO2 NPs and bulk TiO2 showed a relation between the size of agglomerates (homoagglomerates) and time in freshwater and saltwater but not in ultrapure water. Under both, UV-A and no UV-A treatments, NPs triggered higher cytotoxic responses than conventional bulk material. TiO2 NPs produced higher increasing in ROS production, damage to membrane and quantum yield. The marine microalgae species (P. tricornutum) showed to be more sensitive than the selected freshwater species and higher Ti internalization was reported. Exopolymeric substances (EPS) in the culture media are produced in presence of TiO2 NPs and bulk from microalgae, pointing out a possible defense mechanism, enhancing homoagglomeration and settling processes and reducing bioavailability. In order to assess environmental risk assessment in realistic conditions, UV radiation should be considered as key element in toxicity assay guidelines.
DescriptionTrabajo presentado en el 30th ESCPB Congress (New European Society for Comparative Physiology and Biochemistry, "Unraveling complexity: from molecules to ecosystems"), celebrado en Barcelona del 4 al 7 de septiembre de 2016.
Appears in Collections:(ICMAN) Comunicaciones congresos
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