Análise do crescimento e perfil bioacumulativo da cianobactéria Geitlerinema unigranulatum UFV-E01 na presença de arsenato de sódio

Abstract

Arsenic is a toxic metalloid that has become a public health problem worldwide. In order to reduce the environmental contamination by this metalloid, which is derived from natural and anthropogenic activities, the use of micro-organisms in bioremediation process has shown to be a promising strategy. A filamentous homocitada cyanobacterium belonging to the order Pseudanabaenales, Geitlerinema unigranulatum UFV-E01, was isolated from an environment contaminated by arsenic, suggesting an ability to deal with the toxic effect of this metalloid. In view of this, this study aimed to characterize the resistance to sodium arsenate and quantify the total arsenic extracellular cyanobacterium G. unigranulatum UFV-E01. Analyses of sodium arsenate resistance showed that the cyanobacterium was able to grow in 50 mM for 20 days. Furthermore, the cyanobacterium G. unigranulatum UFV-E01 accumulated sodium arsenate for 10 days, reducing up to 67% arsenic extracellular. From the data obtained in this study, the cyanobacterium G. unigranulatum UFV-E01 was able to withstand high concentrations of sodium arsenate, although other analysis, the characterization of the metabolic pathways involved in the resistance must be taken to consider their use in environments impacted by arsenic.