Ethanol production from fructose in continuous culture by free and flocculent cells of Zymomonas mobilis |
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Authors: | I. Toran-Diaz V. K. Jain J. C. Baratti |
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Affiliation: | (1) Université de Provence, CNRS, Laboratoire de Chimie Bactérienne, BP 71, 13277, 9 Marseille, France |
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Abstract: | Summary Zymomonas mobilis strain ZM4 was used for ethanol production from fructose (100 g/l) in continuous culture with a mineral (containing Ca pantothenate) or a rich (containing yeast extract) mediium. With both media high conversion yields were observed but the ethanol productivity was limited by the low biomass content of the fermentor. A new flocculent strain of Z.mobilis (ZM4F) was cultivated in a CSTR with an internal settler and showed a maximal productivity of 93 g/l.h (fructose conversion of 80%). When the fructose conversion was 96% an ethanol productivity of 85.6 g/l.h with an ethanol yield of 0.49 g/g (96% of theoretical) was observed. |
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