lactulose is an organic substance with the chemical formula of C12H22O11. It is a yellowish and transparent viscous liquid, and it is a disaccharide composed of galactose and fructose. It does not exist in nature and is mainly used as a sweetener.

lactulose is sweet, its crystal is white and irregular powder, its relative density is 1.5, its melting point is 169℃, it is easily soluble in water, and its solubility is 76.4 1.4%. Its sweetness is equivalent to lactose less than sucrose, which is about 48% ~ 6% of sucrose. It has a cool and mellow feeling, low viscosity, low calorific value, high safety, good stability and no Maillard reaction.