Selection of yeast strains for alcoholic fermentation of sugar beet thick juice and green syrup

► Thick juice and green syrup are excellent raw materials for production of ethanol. ► Saccharomyces cerevisiae strains M1 and M2 efficiently ferment thick juice worts. ► The optimum extract of thick juice worts range between 200 g kg−1 and 250 g kg−1. ► Strain D-2 prefers less dense worts (extract of 200 g kg−1). ► The optimum green syrup worts extract is 200 g kg−1.