The kefir yeast commercial product bought from the local market
used in Caucasus for homemade kefir drink was employed in
the present work. As the manufacturer and researchers report
the kefir grains are mainly consisting of (% w/w) 5.0 ± 0.6 protein,
8.2 ± 1.6 sugars jai 80.7 ± 1.3 H2O (Rimada and Abraham, 2001).
Cell growth and production of biomass were done according to
previous work (Golfinopoulos et al., 2009).