Fermentation of high concentrations of lactose to ethanol by engineered flocculent Saccharomyces cerevisiae |
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Authors: | Pedro M R Guimarães José A Teixeira Lucília Domingues |
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Institution: | (1) IBB – Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal |
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Abstract: | The development of microorganims that efficiently ferment lactose has a high biotechnological interest, particularly for cheese
whey bioremediation processes with simultaneous bio-ethanol production. The lactose fermentation performance of a recombinant
Saccharomyces cerevisiae flocculent strain was evaluated. The yeast consumed rapidly and completely lactose concentrations up to 150 g l−1 in either well- or micro-aerated batch fermentations. The maximum ethanol titre was 8% (v/v) and the highest ethanol productivity
was 1.5–2 g l−1 h−1, in micro-aerated fermentations. The results presented here emphasise that this strain is an interesting alternative for
the production of ethanol from lactose-based feedstocks. |
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Keywords: | Cheese whey Ethanol production Flocculent yeast Lactose fermentation Recombinant S cerevisiae |
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