Ben Ouada S., Ben Ali R., Leboulanger Christophe, Zaghden H., Choura S., Ben Ouada H., Sayadi S. (2018). Effect and removal of bisphenol A by two extremophilic microalgal strains (Chlorophyta). Journal of Applied Phycology, 30 (3), 1765-1776. ISSN 0921-8971.
Titre du document
Effect and removal of bisphenol A by two extremophilic microalgal strains (Chlorophyta)
Ben Ouada S., Ben Ali R., Leboulanger Christophe, Zaghden H., Choura S., Ben Ouada H., Sayadi S.
Source
Journal of Applied Phycology, 2018,
30 (3), 1765-1776 ISSN 0921-8971
The effects and the removal efficiency of bisphenol A (BPA) on two extremophilic Chlorophyta strains, an alkaliphilic Picocystis and a thermophilic Graesiella, were assessed. BPA was shown to inhibit the growth and photosynthesis of both species, but to a greater extent for Graesiella. The growth IC50 (4 days) was 32 mg L-1 for Graesiella and higher than 75 mg L-1 for Picocystis. Oxidative stress was induced in both strains when exposed to increasing BPA concentrations, as evidenced by increased malondialdehyde content. BPA exposure also resulted in an over-expression of antioxidant activities (ascorbate peroxidase, glutathione S-transferase and catalase) in Picocystis whereas they were repressed in Graesiella. Both species exhibited high BPA removal efficiency, reaching 72% for Picocystis and 52.6% for Graesiella at 25 mg L-1. BPA removal was mostly attributed to biodegradation for both species. Overall, according to its extended tolerance and its removal capacity, Picocystis appeared to be a promising species for the BPA bioremediation even at high contamination levels.
