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TitleContinuous ethanol fermentation of lactose by a recombinant flocculating saccharomyces cerevisiae strain
Author(s)Domingues, Lucília
Dantas, Maria M.
Lima, Nelson
Teixeira, J. A.
KeywordsLactose fermentation
Recombinant yeast
Ethanol production
Continuous culture
Issue dateSep-1999
PublisherJohn Wiley and Sons
JournalBiotechnology and Bioengineering
Citation“Biotechnology and bioengineering”. ISSN 0006-3592. 64:6 (1999) 692-697.
Series/Report no.1999;07
Abstract(s)Alcohol fermentation of lactose was investigated using a recombinant flocculating Saccharomyces cerevisiae, expressing the LAC4 (coding for b-galactosidase) and LAC12 (coding for lactose permease) genes of Kluyveromyces marxianus. Data on yeast fermentation and growth on a medium containing lactose as the sole carbon source are presented. In the range of studied lactose concentrations, total lactose consumption was observed with a conversion yield of ethanol close to the expected theoretical value. For the continuously operating bioreactor, an ethanol productivity of 11 g L−1 h−1 (corresponding to a feed lactose concentration of 50 g L−1 and a dilution rate of 0.55 h−1) was obtained, which is 7 times larger than the continuous conventional systems. The system stability was confirmed by keeping it in operation for 6 months.
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series
DCILM - Artigos (Papers)

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