Potential of using a single fermenter for biomass build-up,starch hydrolysis,and ethanol production |
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Authors: | G Saucedo-Castañeda B K Lonsane J M Navarro S Rogssos M Raimbault |
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Institution: | 1. Department of Biotechnology, Autonomous Metropolitan University, Iztapalapa Campus, A P. 55-535, C.P. 9340, Mexico City, Mexico 2. Fermentation Technology and Bioengineering Discipline, Central Food Technological Research Institute, 570 013, Mysore, India 3. Microbiologie Industrielle GBSA, Université Montpeller II, Place E. Bataillon, 34095, Montpellier, France 4. Centre de Montpellier, Biotechnology Unit, ORSTOM, 911, Avenue Agropolis, B.P. 5045, 34032, Montpellier Cédex 1, France
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Abstract: | Data on conversion of starch on biomass and ethanol bySchwanniomyces castellii in an aerobic-anaerobic solid state fermentation is reported.Schwanniomyces castellii grew exponentially in the aerobic phase (12 h) and simultaneously hydrolyzed nearly half (55%) of the starch initially present.
The accumulation of glucose increased up to 12 h, whereas maltose was nearly absent beyond 7 h. Shift of metabolism from oxidative
to fermentative pattern was observed about 10 h as a result of the build-up of CO2 level and faster utilization of O2. The ethanol production in the anaerobic phase reached the level of 89.3 mg ethanol/g initial dry matter by the end of 30
h. A total of 92.9% of the starch is utilized during the fermentation. The overall ethanol conversion yields are 57.8% of
the theoretical value, whereas in the anaerobic phase it was found to be 94.4%. The cell shape, its morphology, and the type
of attachment to the solid support were found to be similar in aerobic and anaerobic phases of fermentation. Data given in
this work indicate the feasibility of using one single fermenter for aerobic growth to generate inoculum as well as to simultaneously
hydrolyze the starch and subsequent anaerobic fermentation to produce ethanol. |
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Keywords: | Index Entries" target="_blank">Index Entries Schwcmniomyces castellii ethanol production solid state fermentation column fermenter inert solid support pith bagasse biomass build-up starch hydrolysis growth characteristics aerobic and anaerobic phases |
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