Intergeneric protoplast fusion of yeast for high ethanol production from cheese industry waste �?? Whey


Krishnamoorthy, R. Narayanan* , K. Vijila and K. Kumutha

In this study, Intergeneric protoplast fusion of the yeast cultures Viz., Saccharomyces cerevisiae and Kluyveromyces marxianus was carried out for enhancing production to ethanol temperature tolerance and lactose utilizing characters in a single stain. S. cerevisiae (Parent 1) has ethanol tolerance, whereas, K. marxianus (Parent 2) is temperature tolerant and also has lactose utilizing capacity. Twelve fused cultures were obtained by protoplast fusion. Fused cultures recorded higher DNA content than the parent strains, which showed complementary banding pattern of two parental Strains. SDS-PAGE confirms the presence of HSP 70 in the fused culture, which is responsible for temperature tolerance. Fermentation of cheese whey was carried out with two parental and fused cultures. The results revealed that the ethanol production was higher with fused culture (12.5%, with 18.09 g/l of biomass) after 72 h of fermentation. Parent 1 showed poor growth on the cheese whey medium, but growth of the Parent 2 was inhibited when the ethanol production reached 6%.

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