The Para-dimethyl-amido-benzaldehyde Test for Indole

Abstract

1. The high estimate formed by Böhme of the utility of this test has been fully confirmed. 2. Other substances, such as skatole-carboxylic acid, which tended to confuse the results of the older method, do not give an indole-like reaction with this reagent. 3. The test is more delicate, and the time required to ascertain the presence of indole is shortened. 4. The method lends itself to accurate colorimetric quantitative estimations, and the amount of indole present at various stages during the cultivation of certain organisms has been determined.