molasses

The process of fermentation of beet molasses to ethanol using dry alcohol yeast Deltaferm AL-18, reactivated in wort with different dry matter content was studied. It is shown that the fermentative activity of these yeasts is higher than the generative one. The concentration of ethanol in the brew is maximum under the condition of reactivation of yeast in the wort (22 % CF). The density of yeast after fermentation decreases proportionally if the yeast is activated in the wort with a higher concentration.

The biosynthesis of cellular polymers of Azotobacter vinelandii N-15 strain using molasses as a carbon source has been optimized. The highest yield of polymer (25.8 % of cell mass) was obtained on a nutrient medium with a molasses concentration of 50 g/l. Using TL-chromatography and IR-spectroscopy the obtained product was identified as polyhydroxybutyrate (PHB), and its properties were investigated. The wetting contact angle was used to characterize the biopolymer film surface properties.