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Related to Indole test: methyl red test, citrate test, urease test


1. A white crystalline compound, C8H7N, obtained from coal tar or various plants and produced by the bacterial decomposition of tryptophan in the intestine. It is used in perfumes and as a reagent.
2. Any of various derivatives of this compound.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈɪndəʊl) or


(Elements & Compounds) a white or yellowish crystalline heterocyclic compound extracted from coal tar and used in perfumery, medicine, and as a flavouring agent; 1-benzopyrrole. Formula: C8H7N
[C19: from ind(igo) + -ole1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈɪn doʊl)

a colorless to yellowish solid, C8H7N, that has a low melting point and a fecal odor, is obtained from coal tar or from animal feces, and is used in perfumery and as a reagent.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Suspected organisms were identified by conventional biochemical tests described earlier.18 Identification tests included citrate utilization test, urease test, indole test, catalase test, DNAse test, Mannitol fermentation test, Esculin hydrolysis test and inoculation of KIA media to test for sugar fermentation and H2S.
All strains were catalase and oxidase-positive, and gave negative results for indole test. The air-liquid two-phase flow simulations indicated that the rpm affected both the sloshing period and the slope of the air-water interface after stable conditions were achieved.
A very similar profile (3207526), with only one difference in the indole test result, was also reported by Balta (26) with V.
subtilis BML5 identification, morphological and various biochemical tests such as Gram staining, catalase test, oxidase test, citrate utilization, lactose fermentation, mannitol test, starch hydrolysis, methyl red test, indole test and Voges-Proskauer test were performed.
Bacteria which give negative results for the indole test include some Aeromonas species and Vibrio spp.
Biochemical tests like catalase test, citrate utilization test, gram staining, indole test, oxidase test, starch hydrolysis test and urease test, etc.
Biochemical characterization of the bacterial isolates was done by catalase test, methyl red test, Oxidase test, Indole test, Voges proskauer test, DNAase test, Sudan III test and Motility test using Sulfide Indole Motility agar (Tittsler and Sandholzer, 1936).
The cultures so obtained were subjected to Gram's staining for checking the purity of growth and morphology of organism and various biochemical tests were applied as oxidase test, catalase test, indole test, citrate utilization, nitrate reduction and carbohydrate fermentation tests (Table 1).
The different biochemical tests performed for the characterisation of the isolated bacteria includes Indole test, Methyl-Red test, Citrate utilisation test, Catalase test.
BSH lb (Lactobacillus sp.) characterized on the basis of biochemical tests whose antibacterial activity zone was of 2 mm found to be negative for catalase test (no bubble formation), negative for indole test, and negative for nitrate reduction test, citrate test, methyl red Voges-Proskeur test, casein hydrolysis test and for starch agar test (Table 1).
The indole test (BioMerieux, Marcy I'Etoile, France) was performed using 5 mL of sterile seawater containing a loop of an individual colony from each pure culture.
The isolate was found to give positive results for Indole Test, Citrate Utilization Test, Urease Test and negative for Methyl Red Test, Voges Proskauer Test.