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Why phenylalanine give negative result with xanthoproteic test?
Wiki User
∙ 12y ago
Phenylalanine gave a yellow to orange color in xanthoproteic test which means it is positive.
Wiki User
∙ 12y ago
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All amino acid having an aromatic ring give a positive xanthoproteic test under identical condition?
No, not all amino acids with an aromatic ring give a positive xanthoproteic test. The xanthoproteic test is mainly positive for amino acids containing aromatic rings with phenolic groups such as tyrosine and phenylalanine. Aromatic amino acids like tryptophan do not give a positive xanthoproteic test under identical conditions.
Why glysine give negative result in xanthoproteic test?
No because it doesn't contain aromatic group
What tripeptide will give a positive xanthoproteic test?
Phenylalanine. When phenylalanine is subjected to a xanthoproteic test, it will produce a yellow solution due to the reaction of the aromatic ring with nitric acid, indicating the presence of phenyl group in the tripeptide.
Does human insulin give positive xanthoproteic test?
No because it doesn't contain aromatic group
Why is the xanthoproteic test for phenol negative?
I reckon the answer would be that phenol has a hydroxyl group (-OH) which is bonded to a phenyl ring. It yields the same positive result like tyrosine which has a hydroxyl group bonded to its phenyl ring.
Will adrenaline give a positive xanthoproteic test?
No, adrenaline will not give a positive xanthoproteic test. The xanthoproteic test is used to detect the presence of proteins, not hormones like adrenaline. Adrenaline is a hormone that is involved in the body's fight-or-flight response, and it does not react in the same way as proteins do in the xanthoproteic test.
When multiplying two numbers with different signs the result will be?
Multiplying a positive and negative number will give a negative result. The result is a negative number.
What are positive and negative controls in an experiment?
Positive controls : an experimental treatment that will give the desired result Negative controls: An experimental treatment that will NOT give the dersired result.
Can drinking too much water give a negative result for infection?
No
Why Should phenylalanine give a yellow Color with concentrated nitric acid?
Phenylalanine gives a yellow color with concentrated nitric acid due to the formation of a nitro derivative. Nitric acid reacts with the aromatic ring of phenylalanine, leading to the formation of a yellow compound.
Which aldehyde do not give fhelings test?
Aromatic aldehydes, such as benzaldehyde, typically do not give a positive Fehling's test due to the lack of alpha-hydrogens required for oxidation. Aromatic aldehydes are not easily oxidized in the Fehling's test compared to aliphatic aldehydes.
Why does negative times negative give a positive result?
2 negatives equal a positive or if you multiply a negative by a positive it is larger negative if you multiply a negative and a negative it become positive because doing something negative times is getting bigger
