Abstract
This study describes the ability of a yeast strain, Aureobasidium pullulans KKUY0701 isolated from eutrophic lake to eliminate Cylindrospermopsis raciborskii and cylindrospermopsin (CYN) toxin. The anti-cyanobacterial activity of this yeast strain was evaluated by growing with living cells and filtrate of C. raciborskii. CYN bioremoval was assayed using living and heat-inactivated yeast cells. Both living cells and filtrate of this yeast strain were able to suppress the growth of C. raciborskii, with total cell death occurring at day 2 and day 3, respectively. Living and inactivated yeast cells, but not yeast filtrate, reduced CYN concentrations released into cyanobacterial cultures, indicating that this toxin might be removed from the culture medium via absorption onto yeast surface rather than enzymatic biodegradation. The adsorption experiments also confirmed the elimination of CYN by living and heat-inactivated yeast. Nevertheless, inactivated yeast exhibited higher capacity (K = 3.3) and intensity (n = 1.4) than living yeast (K = 1.9, n = 1) for CYN adsorption. The study suggests that this yeast strain could be employed for bioremediation of Cylindrospermopsis blooms in freshwaters. Additionally, heat-inactivated yeast biomass could be used in slow sand filters for elimination of CYN in drinking water treatment plants.
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The authors extend their appreciation to the Deanship of Scientific Research, King Khalid University for funding this work through research groups program under grant number R.G.P. 1/97/43.
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The authors declare that funding received from Deanship of Scientific Research, King Khalid University for funding this work through research groups program under grant number R.G.P. 1/97/43 was used in the design experiments and collection, statistical analysis, data interpretation, and writing the manuscript.
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MH, SA, and YM cultured A. pullulans strain and followed its growth in bioremoval experiments. ZM collected and tabulated data of anti-cyanobacterial and toxin-degrading yeast. ZM set up the experiments of anti-cyanobacterial activity of A. pullulans and cylindrospermopsin adsorption and was a major contributor in writing the manuscript. All authors participated in analysis and interpretation of the data and read and approved the final manuscript.
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Mohamed, Z., Alamri, S., Hashem, M. et al. Bioremoval of Cylindrospermopsis raciborskii cells and cylindrospermopsin toxin in batch culture by the yeast Aureobasidium pullulans. Environ Sci Pollut Res 29, 90140–90146 (2022). https://doi.org/10.1007/s11356-022-22069-x
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DOI: https://doi.org/10.1007/s11356-022-22069-x