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What is the reaction mechanism in the Fehlings test using maltose as the reducing sugar?
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What is the reaction mechanism in the Fehlings test using maltose as the reducing sugar?
Why is lactose a reducing sugar but not sucrose?
In order to be a reducing sugar, the sugar needs a free aldehyde or ketone group.
All the monosaccharides, including glucose and fructose, have this property, as do some of the di- and polysaccharides, such as lactose and maltose. In sucrose, however, the carbon elements of the aldehyde groups are bonded in what’s called a glycosidic bond so that sucrose cannot form an open- chain structure with an available aldehyde group.
Further details of reducing sugars can be found in this Wikipedia article.
In order to be a reducing sugar, the sugar needs a free aldehyde or ketone group.
All the monosaccharides, including glucose and fructose, have this property, as do some of the di- and polysaccharides, such as lactose and maltose. In sucrose, however, the carbon elements of the aldehyde groups are bonded in what’s called a glycosidic bond so that sucrose cannot form an open- chain structure with an available aldehyde group.
Further details of reducing sugars can be found in this Wikipedia article.
“Disaccharides are formed from two monosaccharides and can be classified as either reducing or nonreducing. Nonreducing disaccharides like sucrose and trehalose have glycosidic bonds between their anomeric carbons and thus cannot convert to an open-chain form with an aldehyde group; they are stuck in the cyclic form. Reducing disaccharides like lactose and maltose have only one of their two anomeric carbons involved in the glycosidic bond, meaning that they can convert to an open-chain form with an aldehyde group.”
“Disaccharides are formed from two monosaccharides and can be classified as either reducing or nonreducing. Nonreducing disaccharides like sucrose and trehalose have glycosidic bonds between their anomeric carbons and thus cannot convert to an open-chain form with an aldehyde group; they are stuck in the cyclic form. Reducing disaccharides like lactose and maltose have only one of their two anomeric carbons involved in the glycosidic bond, meaning that they can convert to an open-chain form with an aldehyde group.”
Why is lactose a reducing sugar but not sucrose?
In order to be a reducing sugar, the sugar needs a free aldehyde or ketone group.
All the monosaccharides, including glucose and fructose, have this property, as do some of the di- and polysaccharides, such as lactose and maltose. In sucrose, however, the carbon elements of the aldehyde groups are bonded in what’s called a glycosidic bond so that sucrose cannot form an open- chain structure with an available aldehyde group.
Further details of reducing sugars can be found in this Wikipedia article.
Why is lactose a reducing sugar but not sucrose?
In order to be a reducing sugar, the sugar needs a free aldehyde or ketone group.
All the monosaccharides, including glucose and fructose, have this property, as do some of the di- and polysaccharides, such as lactose and maltose. In sucrose, however, the carbon elements of the aldehyde groups are bonded in what’s called a glycosidic bond so that sucrose cannot form an open- chain structure with an available aldehyde group.
Further details of reducing sugars can be found in this Wikipedia article.
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reference: Reducing sugar - Wikipedia
“Disaccharides are formed from two monosaccharides and can be classified as either reducing or nonreducing. Nonreducing disaccharides like sucrose and trehalose have glycosidic bonds between their anomeric carbons and thus cannot convert to an open-chain form with an aldehyde group; they are stuck in the cyclic form. Reducing disaccharides like lactose and maltose have only one of their two anomeric carbons involved in the glycosidic bond, meaning that they can convert to an open-chain form with an aldehyde group.”
reference: Reducing sugar - Wikipedia
“Disaccharides are formed from two monosaccharides and can be classified as either reducing or nonreducing. Nonreducing disaccharides like sucrose and trehalose have glycosidic bonds between their anomeric carbons and thus cannot convert to an open-chain form with an aldehyde group; they are stuck in the cyclic form. Reducing disaccharides like lactose and maltose have only one of their two anomeric carbons involved in the glycosidic bond, meaning that they can convert to an open-chain form with an aldehyde group.”
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