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formaldehyde reacts with oxidised indole ring to give coloured complex .mercuric sulphate in sulphuric acid acts as the oxidising agent
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What is the principle of heat coagulation test for proteins?
The principle of the heat coagulation test for proteins involves the reaction of amino acids and Ninhydrin. When these two react together under high temperatures, fingerprints can be seen.
What test is used to show the reducing property of an aldehyde and a ketone?
tollen's test, fehling's test, iodoform test
Why pyrrole-2-aldehyde does not respond to tollens reagent?
Pyrrole-2-aldehyde does not respond to Tollens reagent because it is not a reducing sugar. Tollens reagent (silver nitrate) is used to test for the presence of aldehyde groups, which are commonly found in reducing sugars. Reducing sugars contain aldehyde groups and are capable of donating electrons to Tollens reagent, forming a silver mirror on the test tube wall. Pyrrole-2-aldehyde does not contain aldehyde groups, and therefore is not a reducing sugar. As a result, it does not react with Tollens reagent.
Is vanillin positive in DNPH test?
Yes, it contains carbonyl functional group- aldehyde! :)
What is the function of Fehling's test?
Fehling's test is used to differentiate between aldehyde and ketones group. An aldehyde group will react with Fehling's reagent to give cuprous oxide resulting in a red precipitate. A Ketone group will not react with Fehling's reagent.
What is the principle of heat coagulation test for proteins?
The principle of the heat coagulation test for proteins involves the reaction of amino acids and Ninhydrin. When these two react together under high temperatures, fingerprints can be seen.
What test is used to show the reducing property of an aldehyde and a ketone?
tollen's test, fehling's test, iodoform test
Principles of colour reaction of protein?
1. biuret test 2. xhenthoproteic test 3. millon's test 4. Cole's aldehyde test 5. sakaguchi test 6. lead acetate test 7. ninhydrin test 8. gram negative bacteria test 9. phenolphthalein test
Why pyrrole-2-aldehyde does not respond to tollens reagent?
Pyrrole-2-aldehyde does not respond to Tollens reagent because it is not a reducing sugar. Tollens reagent (silver nitrate) is used to test for the presence of aldehyde groups, which are commonly found in reducing sugars. Reducing sugars contain aldehyde groups and are capable of donating electrons to Tollens reagent, forming a silver mirror on the test tube wall. Pyrrole-2-aldehyde does not contain aldehyde groups, and therefore is not a reducing sugar. As a result, it does not react with Tollens reagent.
How you test if foods have proteins?
The Biuret test allows one to test for proteins.
Is vanillin positive in DNPH test?
Yes, it contains carbonyl functional group- aldehyde! :)
What is the function of Fehling's test?
Fehling's test is used to differentiate between aldehyde and ketones group. An aldehyde group will react with Fehling's reagent to give cuprous oxide resulting in a red precipitate. A Ketone group will not react with Fehling's reagent.
What substances give a positive tollens test?
When adding the aldehyde or ketone to Tollens' reagent, the test tube is put in a warm water bath. If the reactant under test is an aldehyde, Tollens' test results in a silver mirror. If the reactant is a ketone, it will not react because a ketone cannot be oxidized easily. A ketone has no available hydrogen atom on the carbonyl carbon that can be oxidized - unlike an aldehyde, which has this hydrogen atom.
Is cinnamaldehyde an aldehyde or ketone?
cinnamaldehyde is a aldehyde hence cinnam(aldehyde)
What is the principle of molisch test?
principle of molisch's testIt's based on the dehydration of the carbohydrate by sulfuric acid to produce an aldehyde, which condenses with two molecules of α-naphthol,resulting in appearance of a purple ring at the interface between the acid and test layers.
Which aldehyde do not give fhelings test?
All aldehydes give a positive result with Fehling's test. All ketones give negative results.
What is the name of the test for proteins?
The biuret test
