Bioresource Technology, Vol.72, No.3, 261-266, 2000
Bioconversion of starch to ethanol in a single-step process by coculture of amylolytic yeasts and Saccharomyces cerevisiae 21
Ethanol production by a coculture of Saccharomyces diastaticus and Saccharomyces cerevisiae 21 was 24.8 g/l using raw unhydrolysed starch in a single-step fermentation. This was 48% higher than the yield obtained with the monoculture of S. diastaticus (16.8 g/l). The maximum ethanol fermentation efficiency was achieved (93% of the theoretical value) using 60 g/l starch concentration. In another coculture fermentation with E. capsularis and S. cerevisiae 21, maximum ethanol yield was 16.0 g/l, higher than the yield with the monoculture of Endomycopsis capsularis. In batch fermentations using cocultures maximum ethanol production occurred in 48 h of fermentation at 30 degrees C using 60 g/l starch. Fermentation efficiency was found lower in a two-step process using sr-amylase and glucoamylase-treated starch.
Keywords:ZYMOMONAS-MOBILIS;ALCOHOL FERMENTATION;FERMENTING STRAINS;MIXED CULTURE;SACCHARIFICATION;DIASTATICUS;POTATO