Disaccharides are made up of two monosaccharides and are generally found in fruits and vegetables, consisting of sugar beets and sugar cane, and also as lactose in dairy products.

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From: The brand-new Public health and wellness (Third Edition), 2014

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Disaccharides consist of of two monosaccharide units, attached by glycosidic bonds in the α or β orientation. The most important disaccharides are sucrose, lactose, and maltose. Sucrose is composed of a molecule of α-glucose and also a molecule of β-fructose linked together (Figure 2A). Lactose is discovered in milk and dairy products and also consists the a molecule that galactose linked to a glucose molecule through a β-1,4glycosidic shortcut (Figure 2B). Maltose is mainly developed by partial hydrolysis that starch and also consists of 2 glucose units linked through one α-1,4glycosidic link (Figure 2C). Part nutritionally necessary disaccharides and also their meaning are outlined in Table 2.


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ClassSpeciesSignificance
DisaccharideSucroseConstituent of fruits, vegetables, and sweetener
LactoseConstituent that milk and also dairy products
Maltose, IsomaltoseConstituent of starch
TrehaloseFood additive, constituent of mushrooms
LactuloseLactose derivative, laxative
Disaccharide alcoholsMaltitolConstituent the starch, sweetner
LactitolConstituent that lactose, sweetener

C. Stylianopoulos, in Encyclopedia of human being Nutrition (Third Edition), 2013

Acid

Disaccharides and oligosaccharides in mild acidic problems are hydrolyzed right into their ingredient monosaccharides. The fructofuranosyl linkages that the fructooligosaccharides are fairly susceptible to mountain hydrolysis.

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Polysaccharides are likewise hydrolyzed right into their constituent monosaccharides by acid hydrolysis, but the problems necessary for complete hydrolysis rely on the solubility of the polymers. The bulk of polysaccharides (e.g., starch) are completely hydrolyzed under weak mountain conditions. Top top the contrary, cellulose requires treatment with strong acid for number of hours before hydrolysis, and subsequent heating under weak acidic problems for the perfect of the reaction. The uronans are an extremely resistant to complete acid hydrolysis and also generally create disaccharides of aldobiuronic acids. Mountain hydrolysis that polysaccharides outcomes in considerable losses of your monosaccharide constituents.