RESUMO
Saccharomyces cerevesiae which is used for ethanol production from sugar-cane molasses and the biomass is a by-product used as fodder yeast from molasses in sugar factories in Egypt was optimized to be used as a Baker's yeast. The nitrogen and phosphorus sources i.e. urea and super calcium phosphate were replaced by diammonium phosphate as a sole for both nitrogen and phosphorus in the growth medium. The modification in the constituents of growth medium led to high ethanol and yeast production as well as the ash content decreased from 11.2% to be 7.8%, viable cells increased from 9x 10[9] 1g to 9.45 x 10[9] /g and gas production increased from 510 m m.Hg to be 650 m m.Hg for fodder yeast and improved fodder yeast respectively. The baking quality, organoleptic properties and staling rate of balady bread prepared with those different types of yeast indicated that, the new isolate yeast [improved fodder yeast] is a good source as baker's yeast