However, the produced ethanol by kefir immobilized on DCM
and BSG was also high compared with that of FC and GP biocatalyst.
Ethanol concentration during whey fermentation by kefir cells
immobilized on MSR reached near 3.24 mL/100 mL of whey, while
by kefir immobilized on BSG and DCM about 2.13 and 2 mL/
100 mL, respectively. The potential of diary distillation of the fermentation
broth in order to obtain such a low ethanol concentration
is very expensive. However, it is clear that the ethanol
production in presence of kefir cells immobilized on MSR and
BSG or DCM was about 2.5-fold and 1.5-fold higher respectively
compared with the ethanol obtained during whey fermentation
by kefir FC. Therefore, further scientific research on cell immobilization
is required in order to increase ethanol concentration during
whey fermentation by kefir.