Ch_322b_22.11 - Dissacharides Disaccharides are...

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Dissacharides Disaccharides are carbohydrates made up of two monosaccharides joined through an acetal linkage. Hydrolysis of a dissacharide yields the two monosaccharides. maltose H 2 O glucose + glucose lactose H 2 O glucose + galactose sucrose H 2 O glucose + fructose cellobiose H 2 O glucose + glucose Both maltose and cellobiose yield two equivalents of glucose upon hydrolysis. While these dissacharides have the same monosaccharide composition, they differ in the acetal linkage.
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Maltose Maltose is a product of the partial hydrolysis of the polysaccharide starch by the enzyme diastase . some observations on maltose Hydrolysis of one mole of maltose gives two moles of D-(+)-glucose. Maltose is a reducing sugar , meaning that it gives a positive test with reagents such as Tollen's solution (Ag + (NH 3 ) 2 - OH) and Benedict's reagent (Cu 2+ complex). Both reagents oxidize aldehydes leading to a "positive test." Oxidation by Br 2 /H 2 O yields a mono-acid. Maltose undergoes enzymatic hydrolysis by maltase . These observations are consistent with the following structure for maltose.
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A B The two monosaccharide units are represented by A and B, which are both glucose.
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