Limnothrix sp. KO05: A newly characterized cyanobacterial biosorbent for cadmium removal: The enzymatic and non-enzymatic antioxidant reactions to cadmium toxicity

In this study, we isolated five indigenous cyanobacterial strains from different aqueous environments, with heavy metals contamination, in East Azerbaijan Province (northwest portion of Iran). A strain was identified by morphological and 16S rRNA sequence analysis as Limnothrix sp. KO05 and selected for further studies as having the greatest potential for cadmium uptake. Scanning electron microscopy (SEM) demonstrated cyanobacterium Limnothrix sp. KO05 forms filamentous structures and is straight or curved to some extent. The utmost biosorption capacity was found to be 82.18±1.22mgg−1 at a Cd (II) concentration level of 150mgL−1. Langmuir adsorption isotherm indicated a better fit to the experimental data. Response surface methodology (RSM) on the basis of four independent variables and the predicted maximum biosorption efficiency was 98.7% under the optimum condition. FT-IR spectroscopy profile of the Cd treated sample as demonstrated in confirmation of the benefits of various functional groups of proteins and polysaccharides of cyanobacterial biomass, involved in surface binding of Cd. The determination of catalase (CAT) activity in strain KO05 exposed to Cd (II) concentrations of 2, 5 and 10mgL−1 showed an increase in enzyme activity after 24hours exposure compared to unexposed cells. Correspondingly, CAT activity showed a significant decrease after 48hours of treatment with Cd (II) concentrations of 5 and 10mgL−1. CAT activity was decreased ...
Source: Environmental Toxicology and Pharmacology - Category: Environmental Health Source Type: research

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