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Proceedings of the 1986 International Congress on Renewable Energy Sources. Production of ethanol from Jerusalem Artichoke. International Congress on Renewable Energy Sources [18-23 Mayo 1986, Madrid].




Jerusalem Artichoke is a plant which has been cultivated in Portugal for a long time and has been traditionally used as fodder. It produces a large amount of sugars (glucofructans) in marginal agricultural land. A series of agricultural experiments were done, in order to compare clones already adapted to portuguese conditions, with others that have been described in the literature, as yielding high productions in other countries. The fermentation of these sugars in ethanol by cells of Kluyveromyces fragilis has been studied using the mash, the juice and the resulting pulp. Ethanol concentrations of 13. INTRODUCTION. (v/v) have been obtained in juice in less than three days using free cells. Entrapment cell techniques in calcium alginate, K-carrageenan and polyurethane were compared over repeated batch fermentations of the juice. The entrapped cells retained the ethanol productivity (1.2 gl-1h-1) over six fermentations which took place in 650 hours. The polyurethane showed better mechanical properties than the polysaccharide gels, which favour the use of this synthethic polymer as cell matrix for immobilization. These results suggest the use of continuos fermentation of Jerusalem artichoke with entrapped cells for the production of ethanol. MATERIALS AND METHODS. Biological material. Analysis. RESULTS AND DISCUSSION. REFERENCES.

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Ministerio de Ambiente y Energía. Secretaría de Planificación del Sub-Sector Energía - Centro de Información de Energía y Ambiente, CIENA

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