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Indole ring of tryptophan reacts with para methyl amino benzaldehyde under acidic condition to give a purple colour complex.

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16y ago
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6mo ago

Ehrlich's test is a presumptive test for the presence of indole compounds, such as tryptophan, in a sample. It relies on the reaction between indole compounds and p-dimethylaminobenzaldehyde to produce a blue-colored complex. This test is commonly used in microbiology to detect the indole production by bacteria such as Escherichia coli.

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Q: Principle of ehrlich's test
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