UVR and PAR absorbing compounds of marine brown macroalgae along a latitudinal gradient of the Brazilian coast

Absorption spectra are indicative of biological sample chemical composition and can be used as a basis for the construction of descriptive and predictive models for biotechnological screening or assays. In marine algae, chemical composition can vary due to species-specific differences in biochemistr...

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Published in:	Journal of photochemistry and photobiology. B, Biology Vol. 178; pp. 165 - 174
Main Authors:	Schmitz, Caroline, Ramlov, Fernanda, de Lucena, Leidson Allan Ferreira, Uarrota, Virgilio, Batista, Manuela Bernardes, Sissini, Marina Nasri, Oliveira, Iara, Briani, Bruno, Martins, Cintia D.L., Nunes, José Marcos de Castro, Rörig, Leonardo, Horta, Paulo Antunes, Figueroa, Félix L., Korbee, Nathalie, Maraschin, Marcelo, Bonomi-Barufi, José
Format:	Journal Article
Language:	English
Published:	Switzerland Elsevier B.V 01-01-2018 Elsevier BV
Subjects:	Abiotic factors Absorption Absorption spectra Absorption, Radiation Algae Antioxidants Brazil Brown algae Carotenoids Chemical composition Coastal environments Coastal management Coasts Environmental management Marine chemistry Phaeophyceae - chemistry Phenolic compounds Phenols Prediction models Radiation Radiation-Protective Agents - chemistry Scientific imaging Screening Seaweed - chemistry Solar radiation Species Spectrophotometer Ultraviolet radiation Ultraviolet Rays UV–VIS Water temperature Brazil Screening Brown algae UV–VIS Spectrophotometer Radiation
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Summary:	Absorption spectra are indicative of biological sample chemical composition and can be used as a basis for the construction of descriptive and predictive models for biotechnological screening or assays. In marine algae, chemical composition can vary due to species-specific differences in biochemistry, as well as intra-specific responses to unique environmental variables. Different indices (UVCi, UVB+Ai and PARi) were proposed and calculated to evaluate how photoprotective compounds vary in 18 species of Phaeophyceae. In addition, they were correlated to abiotic factors. Through this technique, seven main peaks were detected in the absorbing spectra of marine brown algal extracts. The highest photoprotective indices values were found in species collected in tropical areas, where higher solar radiation is observed compared to the southern Brazilian coast. Considering additional abiotic factors, water temperature and nitrate concentration were negatively correlated with UV indices. PARi's indices were positively affected by nitrate. All species collected on the Brazilian coast have absorption peaks in the region of phenolic compounds and carotenoids, suggesting that tropical marine brown macroalgae may have developed an effective antioxidant defense system, suggesting adaptation to environments characterized by high solar radiation. UVR/PAR indices congregated essential information to possible future biotechnological screening, facilitating selection of high priority species or sites, fostering actions to enhance alternative sustainable management strategies of coastal environments. •Different indices were proposed to evaluate how photoprotective compounds vary.•The highest indices values were found in species collected in tropical areas.•Water temperature and nitrate concentration were negatively correlated with UV indices.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1011-1344 1873-2682
DOI:	10.1016/j.jphotobiol.2017.10.029