Some authors have proposed the use of a biocatalyst consisting of
ß-galactosidase co-immobilized with S. cerevisiae cells as an alternative
for whey fermentations (Hahn-Hägerdal, 1985; Roukas and Lazarides,
1991). Hahn-Hägerdal (1985) reported that S. cerevisiae co-immobilized
with ß-galactosidase in calcium alginate yielded higher ethanol titre