Reducing sugars are sugar molecules that have a free ketone or aldehyde group. All monosaccharide are reducing sugars. Disaccharides and polysaccharides can be reducing or non reducing. Sucrose is a non reducing sugar disaccharide. The C1 of the glucosyl unit is linked to the C2 of the fructosyl unit by a glycosidic bond to form sucrose. Since the reducing groups of C1 and C2 are involved in the glycosidic bond, sucrose is a non reducing sugar. Maltose on the other hand is a reducing sugar. The C1 of the sugar glucose is linked to C4 of another glucose by Continue reading...