Kinetic of sugar consumption and ethanol production on very high gravity fermentation from syrup of dates by- products (Phoenix dactylifera L.) by using Saccharomyces cerevisiae, Candida pelliculosa and Zygosaccharomyces rouxii

S. Chniti 1 M. Jemni I. Bentaha 2 M.A. Shariati Y. Kadmi H. Djelal 1 A. Amrane 1 M. Hassouna 2 H. Elmsellem
1 ISCR - Institut des Sciences Chimiques de Rennes
2 Ecole supérieure des industries alimentaires de Tunis
Abstract : Three yeasts, Saccharomyces cerevisiae, Zygosaccharomyces rouxii and Candida pelliculosa, were tested for ethanol production on dates'syrup. In batch fermentation, the ethanol concentration depended on the initial sugar concentration and the yeast strain. For an initial sugar concentration of 17.4°Brix, maximum ethanol concentration was 63 g/L during S. cerevisiae growth, higher than the amounts achieved during Z. rouxii and C. pelliculosa growth, 33 g/L and 41 g/L respectively. On 35.8°Brix initial sugar amount, only Z. rouxii was able to grow, resulting in 50 g/L ethanol production, showing an inhibitory effect on S.cerevisae and C. Pelliculosa due to the osmotic stress resulting from the high sugar concentration.
Keywords : Dates 'syrup Ethanol Osmotic stress Production Sugar Yeasts
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S. Chniti, M. Jemni, I. Bentaha, M.A. Shariati, Y. Kadmi, et al.. Kinetic of sugar consumption and ethanol production on very high gravity fermentation from syrup of dates by- products (Phoenix dactylifera L.) by using Saccharomyces cerevisiae, Candida pelliculosa and Zygosaccharomyces rouxii. Journal of Microbiology, Biotechnology and Food Sciences, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, 2017, 7 (2), pp.199-203. ⟨10.15414/jmbfs.2017.7.2.199-203⟩. ⟨hal-01639688⟩

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