Seliwanoff test and Xanthoproteic test are used for the identification of and respectively.

Question

Seliwanoff test and Xanthoproteic test are used for the identification of  and  respectively.

Canvas Classes · Accepted Answer

Test identification:

Seliwanoff's test:
- Reagent: Resorcinol in HCl
- Detects ketoses (e.g., fructose)
- Ketoses undergo rapid dehydration to form hydroxymethylfurfural, which reacts with resorcinol to give a cherry-red colour
- Aldoses give a faint pink colour only after prolonged heating

Xanthoproteic test:
- Reagent: Concentrated HNO₃
- Detects proteins (specifically aromatic amino acids — Tyr, Phe, Trp)
- Nitration of aromatic ring gives a yellow colour, which turns orange in alkaline con

More questions from Biomolecules