What causes the appearance of the positive result for indole

Last updated: 5/13/2023

What causes the appearance of the positive result for indole test tryptophan is broken down product reacts with Kovac s reagent and turns red O hydrogen sulfide H2S is made it reacts with iron in the media and turns black O phenylalanine is broken down breakdown product reacts with FeCl3 and turns green ammonia is produced and this turns phenol red hot pink