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Grade: 12
        Are there any tesrs to distinguish glucose & fructose?
2 years ago

Answers : (3)

23047 Points
Dear Yash
Glucose and fructose can be distinguished by a number of chemical tests such as:
Seliwanoff’s test- It is a chemical test that distinguishes between aldose (glucose) and ketose (fructose) sugars.  This test is based on the fact that, when heated, ketoses are more rapidly dehydrated than aldoses. Acid hydrolysis of sugars is followed by adding resorcinol and concentrated HCl. The dehydrated ketose then reacts with the resorcinol to produce a deep cherry red colour. Aldoses may react slowly to produce a faint pink colour.
Furfural test- The sugar is treated with an alcoholic solution of alpha-naphthol and concentrated HCl and the mixture is boiled. An immediate violet colour is produced with fructose. Whereas, the colour appears after a few minutes with glucose. 
Ammonium Molybdate test- Freshly prepared 4% aqueous solution of ammonium molybdate is added to an equal volume of 1% solution of sugar in a boiling tube, followed by 4-5 drops of glacial acetic acid. As the boiling tube is heated, fructose gives a greenish-blue coloration within 3-4 minutes whereas, glucose gives only a very faint coloration after 10 minutes. 
Arun (askIITians forum expert)
2 years ago
E.Nandhini ketha
115 Points
							the chemical tests to distinguish between glucose and fructose are,
1.Seliwanoff's test
2.amonium molybdate test
3.furfural test
2 years ago
13 Points
							Glucose is dextrorotary but fructose is levorotatory The structure of glucose is differ from fructose because in glucose oh group is present but in case of fructose CHO group is present
one year ago
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