Soy milk found to be good substrate for commonly used probiotics i.e. bifidobacterium and lactobacillus
species (Farnworth et al., 2007; Wang, Yu, & Chou, 2004). The replacement of cow milk with soybean extract is known to improve the pH of probiotic ice cream for increased survival of probiotics (Heenan et al., 2004). In addition, the lecithin of soybean extract may act as emulsifier and thus provide physical protection against freezing damage and acidic gastric condition by encapsulating probiotics with their lecithin and proteins (Akesowan, 2009)