engleski

Ethanol production from corn semolina by bakers and wine yeasts

Higher fuel prices and global warming have brought upon the need for alternative fuels. The goal of this work was to optimize a two-step production of ethanol from mixtures of corn cultivars specific for Croatia (Pioneer PR36B08, PR36R10, and Osječka OS 596, OS 602), for possible application in the bioethanol production. Sacharification was conducted using commercial amylases Endozyme Alphamyl SB1 and Attenuzyme, while fermentations were performed using baker's and wine's strains of yeast Saccharomyces cerevisiae. Results showed that the chosen enzymes and the method applied are suitable for the saccharification of starch from these corn cultivars and could be applicable in the industrial production. The chosen yeast strains are technologically suitable, because of their fast fermentation and good tolerance on high sugar concentration at the begining of the process and the ethanol concentration at the end of fermentation. The yield of ethanol achieved in 20 hours of fermentation (9, 2 %) was economically sufficient for distillation process. The process required about 2, 8 kg of corn mixture for every 1 liter of ethanol.

ethanol; corn

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