Lactose (lactobiose, milk sugar) is a disaccharide consisting of residues of galactose and glucose. An important component of the milk of mammals and humans. Is formed in the process of lactation in the breast of glucose (see) and is for newborns its source. Lactose facilitates the absorption of calcium from the intestines. Lactose content of human milk is approximately 7 g/100 ml, in the milk of cows and goats - 4.5 g/100 ml
Cm. also Disaccharides.