Possession of some desirable enzyme activities such as b-galactosidase (b-Gal) and b-glucosidase (b-Glu) is another advantage because b-Gal alleviates lactose intolerance (de Verse et al., 2003) and b-Glu liberates bioactive aglycones from isoflavone glucosides (Chun et al., 2007). Microorganisms belonging to the genera of Lactobacillus, Leuconostoc, Pediococcus, and Bifidobacterium are the most common probiotics.