Chemical. CAS 6363-53-7. Formula C12H22O11 . H2O. MW 342.29 . 18.02. D--Maltose monohydrate is a component of starch and glycogen. It is a sugar composed of 2 alpha-D-glucose molecules coupled by an alpha1→4 glycosidic bond. It is a reducing sugar with one anomeric carbon not linked in an anomeric bond. It contains a hemiacetal function and can mutarotate. Maltose is one product generated from starch and glycogen by the action of alpha-amylase. Maltose can be further hydrolyzed to glucose by the action of alpha-glucosidase maltase, an enzyme commonly found in yeast and many other sources. It is called malt sugar when it is formed in fermenting grains during the production of alcoholic beverages. D--Maltose monohydrate is used as a sweetener with about one-third the sweetness of sucrose and as a nutrient in culture media. It is used in pharmaceutical formulations and as a parenteral supplement of sugar for diabetics.