Please use this identifier to cite or link to this item: https://hdl.handle.net/1822/16700

TitleRemoval of heavy metals using a brewer's yeast strain of saccharomyces cerevisiae: advantages of using dead biomass
Author(s)Machado, Manuela D.
Janssens, S.
Soares, Helena M. V. M.
Soares, Eduardo V.
KeywordsBioremediation
Copper
Nickel
Saccharomyces cerevisiae
Yeast flocculation
Zinc
Issue date2009
PublisherWiley-Blackwell
JournalJournal of Applied Microbiology
CitationMachado, M., Janssens, S., Soares, H. and Soares, E. (2009), Removal of heavy metals using a brewer’s yeast strain of Saccharomyces cerevisiae: advantages of using dead biomass. Journal of Applied Microbiology, 106: 1792-1804. https://doi.org/10.1111/j.1365-2672.2009.04170.x
Abstract(s)Aim:  The capacities of live and heat-killed cells of Saccharomyces cerevisiae at 45°C for the removal of copper, nickel and zinc from the solution were compared. Methods and Results:  Kinetic studies have shown a maximum accumulation of Ni2+ and Zn2+ after 10 min for both types of cells, while for Cu2+ this was attained after 30 and 60 min for dead and live cells, respectively. Equilibrium studies have shown that inactivated biomass displayed a greater Zn2+ and Ni2+ accumulation than live yeasts. For Cu2+, live and dead cells showed similar accumulation. Fluorescence, scanning electron microscopy and infrared spectroscopy studies have shown that no appreciable structural or molecular changes occurred in the cells during the killing process. The increased metal uptake observed in dead cells can be most likely explained by the loss of membrane integrity, which allows the exposition of further metal-binding sites present inside the cells. Conclusions:  Heat-killed cells showed a higher degree of heavy metal removal than live cells, being more suitable for further bioremediation works. Significance and Impact of the Study:  Dead flocculent cells can be used in a low cost technology for detoxifying metal-bearing effluents as this approach combines an efficient metal removal with the ease of cell separation.
TypeArticle
URIhttps://hdl.handle.net/1822/16700
DOI10.1111/j.1365-2672.2009.04170.x
ISSN1364-5072
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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