Cereal Chem 40:82 - 86.  |  VIEW ARTICLE

Comparative Hydrolysis Rates of the Reducing Disaccharides of D-Glucopyranose.

M. L. Wolfrom, A. Thompson, and C. E. Timberlake. Copyright 1963 by the American Association of Cereal Chemists, Inc. 

The hydrolytic reaction velocities of the eight reducing D-glucopyranose disaccharides have been determined at 80 degrees and 99.5 degrees plus or minus 0.1 C in 0.1N hydrochloric acid solution. These disaccharides are: kojibiose [alpha-D-(1[arrow]2)], sophorose [beta-D-(1[arrow]2)], nigerose [alpha-D- (1[arrow]3)], laminaribiose [beta-D-(1[arrow]3)], maltose [alpha-D-(1[arrow]4)], cellobiose [beta-D- (1[arrow]4)], isomaltose [alpha-D-(1[arrow]6)]; and gentiobioses [beta-D-(1[arrow]6)]. The reactions of the more readily-available sugars maltose, cellobiose, isomaltose, and gentfobiose were followed by optical rotation in a concentration of 2%; those of the others were followed by copper reducing values using the Somogyi method, with 0.01%, to 0.02% sugar concentrations. From these data the molar activation energies were calculated.