Nostoc piscinale Gt-319, a New Cyanobacterial Strain with Cytotoxic Activity

Antioxidant activities of both cells and extracellular substances were evaluated in 12 soil-isolated strains of microalgae according to FRAP and DPPH-HPLC assays. Their total phenolic contents were also determined by Folin-Ciocalteu method. Extractions were performed with hexane, ethyl acetate, and water. The results of FRAP assay showed that algal cells contained considerable amounts of antioxidants from 0.56 ± 0.06 to 31.06 ± 4.00 µmol Trolox g −1 for Microchaete tenera hexane extract and Chlorella vulgaris water extract, respectively. In water fractions of extracellular substances, the antioxidants were from 1.30±0.15 µmol Trolox g −1 for Fischerella musicola to 73.20±0.16 µmol Trolox g −1 for Fischerella ambigua. Also, DPPH-HPLC assay represented high antioxidant potential of water fractions. The measured radicalscavenging activities of the studied microalgae were at least 0.15±0.02 in Nostoc ellipsosporum cell mass to a maximum of 109.02±8.25 in C. vulgaris extracellular substance. The amount of total phenolic contents varied in different strains of microalgae and ranged from zero in hexane extract to 19.15±0.04 mg GAE g −1 in C. vulgaris extracellular water fraction. Significant correlation coefficients between two measured parameters indicated that phenolic compounds were a major contributor to the microalgal antioxidant capacities.

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Evaluation of antioxidant properties and total phenolic contents of some strains of microalgae

Hajimahmoodi

et al. 2009

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The removal of ρ-chlorophenol in aqueous cultures with free and alginate-immobilized cells of the microalga Tetraselmis suecica

et al. 2012

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The present study aimed at evaluating the ability of some isolated cyanobacterial and microalgal strains for the removal of ρ-chlorophenol (ρ-CP), an environmentally harmful contaminant. To identify the most efficient species, a screening program was carried out using 15 microalgal and cyanobacterial strains. Among them, Tetraselmis suecica was able to remove 67 % of the ρ-chlorophenol at an initial concentration of 20 mg L −1 from the medium within a 10-day period. The efficacy of the process was dependent on the ρ-chlorophenol concentration. At concentrations above 60 mg L −1 of the pollutant, no removal was observed due to the inhibitory effect of ρ-chlorophenol on the T. suecica cells. The effect of cell immobilization in alginate beads on T. suecica removal capacity was also examined. Using this technique, the removal efficacy for the initial ρ-CP concentration of 20 mg L −1 increased up to 94 %.

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Antioxidative responses of Nostoc ellipsosporum and Nostoc piscinale to salt stress

Rezayian

Faramarzi

2018

J Appl Phycol

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Nostoc piscinale Gt-319, a New Cyanobacterial Strain with Cytotoxic Activity

Cited by 4 publications

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Evaluation of antioxidant properties and total phenolic contents of some strains of microalgae

Evaluation of antioxidant properties and total phenolic contents of some strains of microalgae

The removal of ρ-chlorophenol in aqueous cultures with free and alginate-immobilized cells of the microalga Tetraselmis suecica

Antioxidative responses of Nostoc ellipsosporum and Nostoc piscinale to salt stress

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