The cells viability results to be 77% in all the experiences. It is
noteworthy that the polymerization conditions seems not to affect
the immobilized yeast cells viability, even that a strong oxidant
(persulfate ion) and free radicals are present. On the other hand, this
behavior simplifies greatly the immobilization of the yeast cells,
compared with alternative procedures (Perullini et al., 2005). Once
obtained the immobilized yeast, the maintenance of high levels
of living cells could be attributed to the protective effect of the
hydrogel matrix. It could be observed by optical microscopy, that
cells are randomly disposed over the gel surface and mainly forming
colonies.