Lactose is the least disaccharide. Lactose intolerance: The lactose is not absorbed as such by the small intestine. It must first be hydrolyzed (cleaved) into galactose and glucose by the lactase (specific digestive enzyme) which will be absorbed by the small intestine.
Sucrose, maltose, and lactose are the most familiar disaccharides, but there are others. Sucrose (saccharose) glucose + fructose Sucrose is table sugar. It is purified from sugar cane or sugar beets. Maltose. glucose + glucose Maltose is a sugar found in some cereals and candies.