Por favor, use este identificador para citar o enlazar este ítem: http://repositorio.ufc.br/handle/riufc/67591
Tipo: Artigo de Periódico
Título : Arsenic biotransformation by cyanobacteria from mining areas: evidences from culture experiments
Autor : Franco, Maione Wittig
Ferreira, Fernanda Aires Guedes
Vasconcelos, Igor Frota de
Batista, Bruno Lemos
Pujoni, Diego Guimarães Florencio
Magalhães, Sergia Maria Starling
Barbosa Júnior, Fernando
Barbosa, Francisco Antônio Rodrigues
Palabras clave : Cyanobacteria;Arsenic speciation;Synechococcus;Growth inhibition;Bioremediation
Fecha de publicación : 2015
Editorial : Environmental Science and Pollution Research
Citación : FRANCO, Maione Wittig et al. Arsenic biotransformation by cyanobacteria from mining areas: evidences from culture experiments. Environmental Science and Pollution Research, [s. l.], v. 22, p. 18607-18615, 2015.
Abstract: Elucidating the role of cyanobacteria in the biotransformation of arsenic (As) oxyanions is crucial to understand the biogeochemical cycle of this element and indicate species with potential for its bioremediation. In this study, we determined the EC50 for As(III) and As(V) and evaluated the biotransformation of As by Synechococcus sp. through highperformance liquid chromatography hyphenated to inductively coupled plasma mass spectrometry (HPLC-ICP-MS) and X-ray absorption fine structure spectroscopy (XAFS). Synechococcus sp. exhibited higher sensitivity to As(III) with an EC50, 96 h of 6.64 mg L−1 that was approximately 400-fold lower than that for As(V). Even though the cells were exposed to concentrations of As(III) (6 mg L−1) approximately 67-fold lower than those of As(V) (400 mg L−1), similar intracellular concentrations of As (60.0 μg g−1) were observed after 30 days. As(V) was the predominant intracellular As species followed by As(III). Furthermore, organic As species such as monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA) were observed in higher proportions after exposure to As(III). The differential toxicity among As oxyanions indicates that determining the redox state of As in the environment is fundamental to estimate toxicity risks to aquatic organisms. Synechococcus sp. demonstrated potential for its application in bioremediation due to the high accumulation of As and production of As organic compounds notably after exposure to As(III).
URI : http://www.repositorio.ufc.br/handle/riufc/67591
ISSN : 1614-7499
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