Nowadays, the majority of prebiotics sold in the market are non-digestible oligosaccharides. Inulin, fructo-oligosaccharides (FOS), galacto-oligosaccharides (GOS), lactulose and polydex- trose are recognized as the well established prebiotics, whereas isomaltooligosaccharides (IMO), xylooligosaccahrides (XOS), and lactitol are categorized as emerging prebiotics