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    ABSTRACT: The present study deals with the biotechnological production of ethanol from sago waste materials. As petroleum has become depleted, renewable energy production has started to gain attention all over the world, including the production of ethanol from sago wastes. In our research we have standardized the production of ethanol from sago wastes using Saccharomyces cerevisiae strain isolated from molasses. The production of ethanol was carried out by means of simultaneous saccharification with acids, followed by fermentation. The yeast strains were isolated from either batter or molasses and the taxonomy was studied by phenotypic characters in comparison with the standard strain Saccharomyces cerevisiae MTCC 173. Among the two isolated strains, S. cerevisiae VITS-M1 isolated from molasses showed better survival rate in different sugars such as glucose, sucrose, maltose and galactose except lactose; it also showed better survival rate at high ethanol concentration and at acidic pH. The saccharification process of sago liquid waste and solid waste was standardized using hydrochloric acid and sulphuric acid under different treatments. The fermented product, ethanol was distilled using laboratory model distillation unit and measured qualitatively using gas chromatography in comparison with the standard analytical grade ethanol. The overall experimental data indicates that the sago liquid waste yielded more ethanol by simultaneous saccharification with 0.3N HCl and 0.3N H2SO4 and fermentation with the S. cerevisiae VITS-M1 isolated from molasses.
    Preview · Article · Jan 2011