Toxicological and behavioral responses as a tool to assess the effects of natural and synthetic dyes on zebrafish early life.
Organic dyes extracted from natural sources have been widely used to develop safety and eco-friendly dyes as an alternative to synthetic ones, since the latter are usually precursors of mutagenic compounds. Thereby, toxicity tests to non-target organisms are critical step to develop harmless dyes to environment and in this context, zebrafish early life stages are becoming an important alternative model. We aimed to assess the toxic effects of the synthetic dye Basic Red 51 (BR51, used in cosmetic industry), the natural dye erythrostominone (ERY, a potential commercial dye extracted from fungi) and its photodegradation product (DERY), using zebrafish early life assays. Developmental malformations on embryos and behavioral impairment on larvae were explored. Our results showed that embryos exposed to BR51 and ERY exhibited a large yolk sac (LOEC = 7.5 mg L-1), possibly due to a deformity or delayed resorption. ERY also induced pericardial and yolk sac edemas at high concentrations (LOEC = 15 and 30 mg L-1, respectively). Moreover, larvae swan less distance and time when exposed to ERY (LOEC = 7.5 mg L-1) and BR51 (LOEC = 1.875 mg L-1). The lowest larvae locomotion have been associated with impairment of the yolk sac, important tissue of the energy source. Interestingly, DERY did not affect neither development nor behavior of zebrafish, showing that ERY photodegradation is sufficient to prevent its toxic effects. In conclusion, both natural and synthetic dyes impaired development and behavior of zebrafish early life, therefore, a simple treatment of the natural dye can prevent the aquatic life impact.
School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, 14040-903, Ribeirão Preto, São Paulo, Brazil; Department of Biology and Centre of Environmental and Marine Studies, University of Aveiro, 3810-193, Aveiro, Portugal. Electronic address: frabe@usp.br.
Flavia R
FR
Abe
Faculty of Philosophy, Sciences and Literature of Ribeirão Preto, University of São Paulo, 14040-901, Ribeirão Preto, São Paulo, Brazil.
Jacqueline N
JN
Mendonça
Faculty of Philosophy, Sciences and Literature of Ribeirão Preto, University of São Paulo, 14040-901, Ribeirão Preto, São Paulo, Brazil.
Luiz A B
LA
Moraes
Faculty of Pharmacy, Federal University of Goiás, 74605-170, Goiânia, Goiás, Brazil.
Gisele A R de
GA
Oliveira
Department of Biology and Centre of Environmental and Marine Studies, University of Aveiro, 3810-193, Aveiro, Portugal.
Carlos
C
Gravato
Department of Biology and Centre of Environmental and Marine Studies, University of Aveiro, 3810-193, Aveiro, Portugal.
Amadeu M V M
AM
Soares
School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, 14040-903, Ribeirão Preto, São Paulo, Brazil.
Danielle P de
DP
Oliveira
D000818:Animals; D001391:Azo Compounds / Q000494:pharmacology; D001522:Behavior, Animal / Q000187:drug effects; D004396:Coloring Agents / Q000633:toxicity*; D004625:Embryo, Nonmammalian / Q000187:drug effects; D004781:Environmental Exposure / Q000517:prevention & control*; D004785:Environmental Pollutants; D007814:Larva / Q000187:drug effects; D008124:Locomotion / Q000187:drug effects; D010782:Photolysis; D015027:Zebrafish / Q000254:growth & development
D001391:Azo Compounds; D004396:Coloring Agents; D004785:Environmental Pollutants; C000589147:Basic Red 51
Basic Red 51; Erythrostominone; Light degradation; Locomotor activity; Malformation