Hydrolysis of glycosidic bonds

Figure 1. Mechanism of acid hydrolysis of glycosidic bonds (compare...

The complete hydrolysis of the soluble cellulose derivative required gradual addition of water and, preferably, acid. Water can act on cellulose acetate hydrogensulfate in three ways (a) saponification of sulfate groups, (b) saponification of acetate groups, and (c) hydrolysis of glycosidic bonds. Reaction (a) is most rapid and occurs under the mildest conditions. As Table II shows, the product is not any more water soluble (Entries 1-4). Under more severe conditions, the deacetylation (b) has proceeded to water-soluble products, the total amount of dissolved carbohydrates corresponding to theory (Entries 5-10). How-... 

A carbohydrate that does not undergo hydrolysis of glycosidic bonds to give smaller sugar molecules, (p. 1102)... 

The acidic hydrolysis of glycosidic bonds is of importance in many technical processes based on wood as raw material. Figure 2-30 illustrates the... 

The main processes occuring in the alkaline degradation of cellulose are the so called degradation of cellulose from the reducing end of the molecule and the alkaline hydrolysis of glycosidic bonds. The former process is observed almost exclusively at temperatures up to 150°C. 

Peeling. Peeling is the term applied to the stepwise depolymerization of polysaccharides from the reducing end groups under alkaline conditions. In conjunction with the formation of new end groups by alkaline hydrolysis of glycosidic bonds, the degradation of the polysaccharides can be extensive. 

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