Abstract
The use of stalks instead of tubers as a source of carbohydrates for ethanol production has been investigated. The inulin present in the stalks of Jerusalem artichoke was extracted with water and the effect of solid-liquid ratio, temperature, and acid addition was studied and optimized in order to attain a high-fructose fermentable extract. The maximum extraction efficiency (corresponding to 35 g/L) of soluble sugars was obtained at 1/6 solid-liquid ratio.
Fermentations of hydrolyzed extracts by baker’s yeast and direct fermentation by an inulinase activity yeast were also performed and the potential to use this feedstock for bioethanol production assessed. The results show that the carbohydrates derived from Jerusalem artichoke stalks can be converted efficiently to ethanol by acidic hydrolysis followed by fermentation with Saccharomyces cerevisiae or by direct fermentation of inulin using Kluyveromyces marxianus strains. In this last case about 30 h to complete fermentation was required in comparison with 8–9 h obtained in experiments with S. cerevisiae growth on acid extracted juices.
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Negro, M.J., Ballesteros, I., Manzanares, P., Oliva, J.M., Sáez, F., Ballesteros, M. (2006). Inulin-Containing Biomass for Ethanol Production. In: McMillan, J.D., Adney, W.S., Mielenz, J.R., Klasson, K.T. (eds) Twenty-Seventh Symposium on Biotechnology for Fuels and Chemicals. ABAB Symposium. Humana Press. https://doi.org/10.1007/978-1-59745-268-7_77
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DOI: https://doi.org/10.1007/978-1-59745-268-7_77
Publisher Name: Humana Press
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