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Indole test positive: appearance of pink layer at top (e.g. Escherichia coli) Like many biochemical tests on bacteria, results of an indole test are indicated by a change in color following a reaction with an added reagent. Pure bacterial culture must be grown in sterile tryptophan or peptone broth for 24–48 hours before performing the test.
Indole is an organic compound with the formula C 6 H 4 CCNH 3. Indole is classified as an aromatic heterocycle. It has a bicyclic structure, consisting of a six-membered benzene ring fused to a five-membered pyrrole ring. Indoles are derivatives of indole where one or more of the hydrogen atoms have been replaced by substituent groups.
The term "IMViC" is an acronym for each of these tests. "I" is for indole test; "M" is for methyl red test; "V" is for Voges-Proskauer test, and "C" is for citrate test. The lower case "i" is merely for "in" as the Citrate test requires coliform samples to be placed "in Citrate". These tests are useful in distinguishing members of ...
The first one consists of the degradation of the amino acid into indole-3-acetate. And in the second step, IAD catalyzes the decarboxylation of the indole-3-acetate to form the final product, skatole. The decarboxylation of indole-3-acetate is chemically difficult since it leaves an unstable carbanion because of the direct elimination of CO 2.
It is used for the diagnostical indole test, to determine the ability of the organism to split indole from the amino acid tryptophan. The indole produced yields a red complex with para-dimethylaminobenzaldehyde under the given conditions. [1] This was invented by the Hungarian physician Nicholas Kovács and was published in 1928.
Indole-3-carboxylate decarboxylase (EC 4.1.1.92) is an enzyme with systematic name indole-3-carboxylate carboxy-lyase. [1] This enzyme catalyses the following chemical reaction indole-3-carboxylate ⇌ {\displaystyle \rightleftharpoons } indole + CO 2
The Madelung synthesis has many important applications in chemistry, biochemistry, and industrial chemistry. This reaction served useful in synthesizing, with an 81% yield, the architecturally complex tremorgenic indole alkaloid (-)-penitrem D, a molecule naturally produced by ergot fungus that causes various muscular and neurological diseases ...
In enzymology, an indole 2,3-dioxygenase (EC 1.13.11.17) is an enzyme that catalyzes the chemical reaction indole + O 2 ⇌ {\displaystyle \rightleftharpoons } 2-formylaminobenzaldehyde Thus, the two substrates of this enzyme are indole and O 2 , whereas its product is 2-formylaminobenzaldehyde .