What two reagents can be used to visualize indole in the broth?
A) Indole and xylene
B) 40% sodium hydroxide and a-naphthol
C) 10% ferric chloride
D) Ehrlich's and Kovac's

Question

Quizplus · Accepted Answer

Ehrlich's and Kovac's reagents both contain the indicator paradimethylaminobenzaldehyde that turns red in the presence of indole.Indole is the by-product that is of interest.Forty percent sodium hydroxide and a-naphthol are used in the Voges-Proskauer test.Ten percent ferric chloride is used in the phenylalanine deaminase test.

What Two Reagents Can Be Used to Visualize Indole in the Broth