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dc.contributor.authorLópez-Figueroa, Félix 
dc.contributor.authorÁlvarez, Félix
dc.contributor.authorCelis Plá, Paula
dc.contributor.authorBouzon, Zenilda
dc.contributor.authorFernandes, Daniela
dc.contributor.authorBonomi, José
dc.contributor.authorDe la Coba, Francisca
dc.contributor.authorKorbee-Peinado, Nathalie 
dc.date.accessioned2015-10-14T09:02:27Z
dc.date.available2015-10-14T09:02:27Z
dc.date.created2015
dc.date.issued2015-10-14
dc.identifier.urihttp://hdl.handle.net/10630/10509
dc.description.abstractRed macroalgae produce UV screen photoprotectors (Mycosporine like amino acids, MAAs) in response to increased UV radiation. They are low-molecular weight water-soluble nitrogen enriched molecules, absorbing UV radiation in the wavelength range 310-365 nm due to their cyclohexenone or cyclohexenimine chromophores. MAAs were quantified by means of high performance liquid chromatography (HPLC). The photoprotection capacity in the macroalgae has been inferred by their accumulation under increased UV radiation (spatial and temporal changes), by the correlation with reduced photoinhibition and decreased photodamage and by the increase of antioxidant activity in the cells. Despite the fact MAAs are nitrogen compounds, only few studies on nitrogen enrichment have been conducted. In this study, the influence of inorganic nitrogen on the accumulation of MAAs both under artificial and solar UVR in several macroalgae is presented . Both MAAs and biliproteins contents of several species increased in ammonium enriched seawater. Algae with high internal N content presented a higher photoprotection capacity, estimated as in vivo chlorophyll fluorescence parameters, than those growing under N depletion conditions. The relative composition of MAAs changed both under high irradiance and blue light, increasing the content of palythine and asterina-330 in relation to porphyra-334 and shinorine. In bifactorial experiments of UVR and nitrate, a positive synergic response of both variables on the production of MAAs was found. MAA content also increased under ammonium enrichment, obtained from fishpond effluents. The highest MAA-productivity was observed in outdoor-grown algae, indicating a positive effect of increased PAR and UVR on MAA accumulation. In conclusion, the accumulation of MAAs is favoured by inorganic nitrogen enrichment in the presence of UVR. MAAs can protect the algae against increased UV radiation through a double function: (1) UV screen capacity in both UVA and UVB radiation and (2) Antioxidant capacity of both oxo- and imino-MAAs. The use of MAAs as photoprotective sunscreens in cosmetic products is discussed.es_ES
dc.description.sponsorshipUniversidad de Málaga, Campus de Excelencia Internacional Andalucía Teches_ES
dc.language.isoenges_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.subjectFotorreceptoreses_ES
dc.subjectRodofíceases_ES
dc.subject.otherPhotoprotectorses_ES
dc.subject.otherAlgaees_ES
dc.titleThe accumulation of UV screen photoprotectors (mycosporine-like amino acids) in red macroalgae is influenced by nitrogen availabilityes_ES
dc.typeinfo:eu-repo/semantics/conferenceObjectes_ES
dc.centroFacultad de Cienciases_ES
dc.relation.eventtitle16th ESP Congresses_ES
dc.relation.eventplaceAveiro, Portugales_ES
dc.relation.eventdate31 agosto 2015es_ES
dc.identifier.orcidhttp://orcid.org/0000-0003-3580-4693es_ES
dc.cclicenseby-nc-ndes_ES


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