Why maltose is reducing sugar

Learn more. Why is maltose a reducing sugar but not sucrose, even though they're both disaccharides? Ask Question. Asked 4 years, 11 months ago. Active 4 months ago. Viewed 27k times. I took the following Haworth projection of sucrose for comparison- That's all fine and dandy, but the thing is, I can't seem to find any source that explicitly explains why this whole 'ring-opening' business even happens in disaccharides like maltose, but not in sucrose.

Can anyone explain this discrepancy? Improve this question. Sir Arthur7 1, 3 3 gold badges 11 11 silver badges 25 25 bronze badges.

Add a comment. Active Oldest Votes. Note: [1]: While formally correct; the actual reaction mechanism involves the loss of this hemiacetalic hydroxy group. Improve this answer. Jan Jan Opening has to occur on the stage of the intact disaccharide. What is requirement for an opening that results in an aldehyde? The carbohydrate has to have a hemiacetal moiety! Sign up or log in Sign up using Google. What is maltose? Maltose Formula. How can I address my symptoms?

Physical and chemical properties Sources and types Soft, hard, alkaline and acidic water Functions, absorption and excretion How much do you need to drink per day?

Dehydration Water intoxication Water retention Water disinfection. Follow Us On:. This indicates that the sugar maltose is a pyranose sugar. This is the Bial's test on fructose. The solution changed to an olive green color. This indicates that the sugar fructose is a pentose -furanose sugar. Because sucrose is a complex disaccharide, it is not classified as either an aldose or a ketone. Instead, it is a compound that contains both. Maltose or malt sugar is an intermediate in the intestinal digestion i.

Reducing monosaccharides include glucose, fructose, glyceraldehyde and gal What is reducing sugar? After being oxidised they cause the reduction of the other substance and so known as reducing sugars. Reducing monosaccharides include glucose, fructose, glyceraldehyde and galactose. A reducing sugar is any sugar that is capable of acting as a reducing agent because it has a free aldehyde group or a free ketone group.

Glucose has a free aldehyde group which can be oxidized to the acidic groups. Hence, glucose is a reducing sugar. Starch and Cellulose are polysaccharides. The glucose in starch and cellulose does not contain a free aldehyde group and hence, starch and cellulose do not act as reducing sugars.

Non - reducing sugars do not have an OH group attached to the anomeric carbon so they cannot reduce other compounds. All monosaccharides such as glucose are reducing sugars. A disaccharide can be a reducing sugar or a non - reducing sugar.

Maltose and lactose are reducing sugars , while sucrose is a non - reducing sugar. Lesson Summary. Aldose and ketose sugars are simple carbohydrates. They are also known as monosacharrides. An aldose sugar contains an aldehyde functional group in its structure; ketose sugars contain ketone functional groups. Aldose sugars that contain more than three carbon atoms possess stereoisomerism.