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Fructose syrups and ethanol production by selective fermentation of inulin

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Abstract

Jerusalem artichoke is a favorable substrate for inulin or fructose syrup production. The sugar content and the fructose ratio of inulin depend on various factors, particularly on the date of harvest. Incomplete fermentation of extracts by selected yeasts allows the production of inulin with increased fructose content. The yeast strains (Saccharomyces cerevisiae, S. diastaticus...) are chosen for their ability to ferment sucrose and inulin small polymers, but not easily inulin large polymers. A good increase in the fructose ratio and a good yield in residual sugars can be obtained with the better strains. After fermentation and acid or enzymatic hydrolysis, extracts from “early” and “late” harvested tubers lead to syrups of good quality containing up to 95% and 90% of fructose respectively. This fermentative enrichment process is competitive with others (for example, chromatographic enrichment), is appropriate to raw extracts, simplifies the purification steps, and also permits the simultaneous benefit of production of by-products in the form of ethanol and yeast (in addition to the pulps). Unhydrolyzed inulin polymers with high fructose content can be recovered by this selective fermentation.

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Authors and Affiliations

  1. Microbiologie et Biochimie Industrielles, Université Montpellier II, PI. E. Bataillon, 34095, Montpellier Cedex 05, France

    S. Schorr-Galindo, A. Fontana & J. P. Guiraud

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  1. S. Schorr-Galindo
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  2. A. Fontana
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  3. J. P. Guiraud
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Schorr-Galindo, S., Fontana, A. & Guiraud, J.P. Fructose syrups and ethanol production by selective fermentation of inulin. Current Microbiology 30, 325–330 (1995). https://doi.org/10.1007/BF00369858

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