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FOS (Fructo oligosaccharide, FOS), also known as cane fruit oligosaccharides, by 1 to 3 groups of fructose by β (2-1) glycosidic bond, fructose and sucrose-binding generated kestose, cane fruit tetrasaccharide and pentasaccharide cane fruit such mixtures. 100 grams of dried weight, about 60-70 g of artichoke inulin, inulin is a linear β-2, 1 - glucoside fructan chain connection, its end is a sugar group. So to Jerusalem artichoke powder as raw material with endonuclease hydrolysis of inulin, by refining the final available oligofructose syrup.