Potentiality of Yeasts in the Direct Conversion of Starchy Materials to Ethanol and Its Relevance in the New Millennium

摘要: In recent years, the use of renewable and abundantly available starchy cellulosic materials for industrial production ethanol is gaining importance, in view fact, that one most prospective future motor fuels, can be expected to replace fossil which are fast depleting world scenario. Although, starch substrates could converted successfully on scales by commercial amylolytic enzymes yeast fermentation, cost rather very high. This mainly due non-enzymatic enzymatic conversion (gelatinization, liquefaction saccharification) sugars, costs around 20 % from starch. this context, yeasts, directly convert a single step, potentially suited reduce T. Satyanarayana, G. Kunze (eds.), Yeast Biotechnology: Diversity Applications, 515 DOI: 10.1007/978-1-4020-8292-4_24, © Springer Science + Business Media B.V. 2009 516 L.V.A. Reddy et al. Research advances made direction have shown encouraging results, both terms identifying yeasts purpose also their economic yields. chapter focuses types digestion fermentable optimization fermentation conditions starch, factors affect potential ethanol, genetic improvement these better efficiency prospects new millennium.