Maltose
Maltose, the disaccharide obtained by enzyme-catalyzed hydrolysis of starch, consists of two D-glucopyranoses joined by a 1,4'-beta-glycoside bond.Both maltose is reducing sugars because the anomeric carbons on the right-hand sugar are part of a hemiacetal.
 
 

                                                                                                                

                                                                                                                  Maltose, a 1,4'-beta-glycoside
                                                                                                [4-0 -(beta-D-Glucopyranosyl)-beta-D-glucopyranose]