Description of FOS:
Fructose-oligosaccharides (FOS) is a mixture of oligosaccharides (GF2, GF3, GF4) which are composed of fructose units connected by ß (2-1) links. These molecules are terminated by a fructose unit. The total number of fructose or glucose units (Degree of Polymerization or DP) of oligofructose ranges mainly between 2 and 4.
Fructose-oligosaccharides (FOS), is also know as Fructo-oligo, FOS directly enters into large intestine without being digested and absorbed by human body, and in intestine it rapidly promotes reproduction of bididobactirium and other probiotics, so FOS is also called "Bifidus Factor".
In China, MOH'S No.11 Announcement of 2009 authorize FOS as a new nutritional fortifiers.
NO.6 Announcement of 2012 authorize FOS source from sucrose, suppiemented as nutrition fortifier.
In Japan, authorize FOS as specific health food.
In USA, FDA validate FOS as a safe class(GRAS) of food ingredient.