University of Khartoum

Screening For Thermotolerant Yeasts in the Sudan

Screening For Thermotolerant Yeasts in the Sudan

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Title: Screening For Thermotolerant Yeasts in the Sudan
Author: Elimam, Iman Mohammed Ali
Abstract: Seventy four thermotolerant yeast strains were isolated from 67 samples taken from different areas in the Sudan. Among the collected yeasts 47 isolates were regarded as thermophilic, 5 isolates regarded as extremely rhermophilic because they grow at 20 °C and 49 °C. The yeasts described as extremely thermophilic were identified to the genus and species level according to Lodder and Barnett. Three isolates were assigned to species Saccharomyces cereivisae and one isolate was assigned Kluyveromyces sp. The optimum growth temperatures ranged between 30 °C and 40 °C. The extremely thermophilic yeast was used in fermentation tests for the production of ethanol. The isolate identified as Kluyveromyces sp. gave final ethanol concentrations in the mash of 6 %( w/v). This amount represented a yield of 83% of the theory. The other isolates gave ethanol concentrations of 3% to 2.5% (w/v) representing yields of only 50% of the theory. This indicates that these isolates are not suitable for ethanol production. Being thermotolerant they could be of interest for single cell protein production.
URI: http://khartoumspace.uofk.edu/handle/123456789/13979
Date: 2015-06-22


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