Hydrolysis glycosidic linkages

In standard aqueous media, hydrolases are enzymes which are able to hydrolyse covalent bonds (Fig. 1). Three classes of hydrolases are used industrially osidases (glycosidic linkage hydrolysis), proteinoses (peptidic linkage hydrolysis) and esterases (ester linkage hydrolysis). 

Its side chain is comprised of three molecules of digitoxose in a glycosidic linkage. Hydrolysis aifects removal of the side chain to yield the aglycone, digitoxigenin (C23H34O4). 

One of the most important differences between cellulose and starch is that animals can digest starch Because the glycosidic linkages m starch are a an animal s a glycosidase enzymes can catalyze then hydrolysis to glucose When more glucose is... 

Sections Disaccharides are carbohydrates in which two monosaccharides are 25.14-25.15 joined by a glycoside bond. Polysaccharides have many monosaccharide units connected through glycosidic linkages. Complete hydrolysis of disaccharides and polysaccharides cleaves the glycoside bonds, yielding the free monosaccharide components. 

Stereochemistry of hydrolysis of glycosidic linkage by three Aspergillus polygalacturonases... 

Polysaccharide solubility in aqueous solutions usually is dependent on polymer size and its allied three-dimensional structure. Even water-insoluble carbohydrates may be solubilized by controlled hydrolysis of o-glycosidic linkages to create smaller polysaccharide molecules. Thus, cellulose may be solubilized by heating in an alkaline solution until the polymers are broken up sufficiently to reduce their average molecular weight. Many such soluble forms of common polysaccharides are available commercially. 

Treatment of cordycepin with nitrous acid, and subsequent hydrolysis of the deaminated product, yields hypoxanthine, indicating that in the adenine moiety the primary amino group is free and the glycosidic linkage involves C7 or C9. The close similarity between the ultraviolet absorption spectrum of cordycepin and those of 9-methyladenine and adenosine63 (9-/3-J>-ribofuranosyladenineMa) favors the latter possibility. The complete stereoisomeric description of cordycepin (XXVIII), formulation of which... 

In contrast to alkaline pulping, the acetyl groups of the hemicellu-loses are relatively stable at low pH, as are the glucuronic acid residues of the xylans. The main effect of high temperature and low pH is the hydrolysis of the glycosidic linkages in the polysaccharide... 

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