Processes and Products Based on Hydrolysis Reactions

The a-D-(l — 4)-linkages are more susceptible to hydrolysis than the a-D-(l — 6)-linkages. The bonds closer to the nonreducing end of the polymer are hydrolyzed somewhat more rapidly than the interior bonds. These differences are, however, relatively small, and the distribution of the hydrolysis products is almost that of a random hydrolysis. An activation energy of 130 kj per mole has been reported for the overall hydrolysis.5 

The small proportions of ash, fatty material, and protein present in the starch have little direct effect on the course of the hydrolysis, al- 

The ability to make corn syrups of high quality at a low cost depends upon having a supply of low-cost, high-purity starch. The com wet-milling operation is very efficient in its separation of corn into its constituent parts of starch, water-soluble materials, protein-fiber-rich materials, and corn oil at high yield and low operating costs. 

The general scheme of operations involved in this separation of com into its primary constituents is given in Fig. 2. 

It should be noted that the com referred to in Fig. 2 is in the kernel form, free from cob or husk material. The com reaching the factory by truck usually comes from an area within —50 miles of the factory, but corn transported by railway may come from much farther away. 

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