Carbohydrates that break down or break down into two molecules of monosaccharides are called disaccharides. Their chemical symbol is C12H22O11. A condensation reaction between two monosaccharide molecules results in the removal of one molecule of H2O from two –OH groups to form a disaccharide. Both monosaccharide molecules of the disaccharide form new C-O-C bonds. The C-O-C bond formed is called a glycosidic bond. Disaccharides such as sucrose (table sugar), maltose, isomaltose, lactose (milk sugar), cellobiose, trehalose etc. When sucrose or sugar is broken down, glucose and fructose are obtained. Again, lactose is broken down to glucose and galactose. Dr. Siddiq Publications