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Indole-3-carbaldehyde (I3A), also known as indole-3-aldehyde and 3-formylindole, is a metabolite of dietary L-tryptophan which is synthesized by human gastrointestinal bacteria, particularly species of the Lactobacillus genus.
At very low concentrations, however, it has a flowery smell, [3] and is a constituent of many perfumes. It also occurs in coal tar. It has been identified in cannabis. [4] It is the main volatile compound in stinky tofu. [5] When indole is a substituent on a larger molecule, it is called an indolyl group by systematic nomenclature.
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.
The process begins by producing 7-chloroindole-3-acetamide by treating 7-chloroindole with a series of reagents, shown farther down. This molecule is then glycosylated and reacted with methyl 7-chloroindole-3-glyoxylate to produce an intermediate that goes on to stabilize into the final product.
3-(4-Carboxybenzoyl)quinoline-2-carboxaldehyde (CBQCA) is a fluorogenic amine labeling dye that is not fluorescent itself, but covalently reacts with primary amines to form fluorescent products. [1] It was first reported in 1991. [2] CBQCA is largely used in the context of quantifying peptides or proteins.
Indole-3-acetaldehyde is a substrate for retina-specific copper amine oxidase, aldehyde dehydrogenase X (mitochondrial), amine oxidase B, amiloride-sensitive amine oxidase, aldehyde dehydrogenase (mitochondrial), fatty aldehyde dehydrogenase, 4-trimethylaminobutyraldehyde dehydrogenase, aldehyde dehydrogenase (dimeric NADP-preferring), aldehyde ...
In addition to the light- or H 2 O 2-induced formation of FICZ, a number of other enzymatic pathways have been identified to convert Trp to FICZ via the precursor I3A. [2] [3] Oxidative deamination of Trp by aromatic amino acid aminotransferases (ArAT) or L-amino oxidases (LAAO), one of which is the IL4-inducible enzyme IL4I1, converts Trp to indole-3-pyruvate, which after decarboxylation ...
The Fischer indole synthesis is a chemical reaction that produces the aromatic heterocycle indole from a (substituted) phenylhydrazine and an aldehyde or ketone under acidic conditions.