Biodegradation of polyphenols with immobilized Candida tropicalis under metabolic induction |
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Authors: | Ettayebi Khalil Errachidi Faouzi Jamai Latifa Tahri-Jouti Mohamed Ali Sendide Khalid Ettayebi Mohamed |
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Affiliation: | Veterinary Molecular Biology, P.O. Box 173610, Montana State University, Bozeman 59717-3142, USA. kettayebi@montana.edu |
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Abstract: | During olive oil production, large quantities of olive mill wastewater (OMW) are produced. This wastewater material, containing a high level of phenolic compounds, poses a serious environmental problem in almost all Mediterranean countries. Candida tropicalis YMEC14 was used as an extremophile strain to design an aerobic biotreatment process to detoxify OMW and reduce its polluting organic load. The process was enhanced by directing yeast metabolism towards biodegradation pathways using hexadecane as co-metabolite and by immobilizing yeast cells in calcium alginate beads. Under immobilization conditions, C. tropicalis YMEC14 grown at 40 degrees C in OMW supplemented with hexadecane resulted in 69.7%, 69.2% and 55.3% reduction of chemical oxygen demand, monophenols and polyphenols, respectively, after a 24-h fermentation cycle. |
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Keywords: | Aerobic biotreatment Calcium alginate immobilization Olive mill wastewater Phenolic compounds Candida tropicalis |
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