Abstract
Ethanol fermentation was carried out with Kluyveromyces marxianus cells at various temperatures (30, 35, 40, and 45 °C). Fermentation performance of the immobilized yeast on banana leaf sheath pieces and the free yeast were evaluated and compared. Generally, ethanol production of the immobilized and free yeast was stable in a temperature range of 30–40 °C. Temperature of 45 °C restricted yeast growth and lengthened the fermentation. The immobilized yeast demonstrated faster sugar assimilation and higher ethanol level in the fermentation broth in comparison with the free yeast at all fermentation temperatures. Change in fatty acid level in cellular membrane was determined to clarify the response of the free and immobilized yeast to thermal stress. The free cells of K. marxianus responded to temperature increase by increasing saturated fatty acid (C16:0 and C18:0) level and by decreasing unsaturated fatty acid (C18:1 and C18:2) level in cellular membrane. For fermentation at 40 °C with immobilized cells of K. marxianus, however, the changes were not observed in both saturated fatty acid (C16:0) and unsaturated fatty acid (C18:1 and C18:2) level.
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This work was financially supported by Vietnam National University, Ho Chi Minh City (Project B2012-20-11TD/HD-KHCN)
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Du Le, H., Thanonkeo, P. & Le, V.V.M. Impact of High Temperature on Ethanol Fermentation by Kluyveromyces marxianus Immobilized on Banana Leaf Sheath Pieces. Appl Biochem Biotechnol 171, 806–816 (2013). https://doi.org/10.1007/s12010-013-0411-z
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DOI: https://doi.org/10.1007/s12010-013-0411-z