Chromogen


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Related to Chromogen: Auxochrome

chromogen

[′krō·mə‚jen]
(biochemistry)
A pigment precursor.
(microbiology)
A microorganism capable of producing color under suitable conditions.

Chromogen

 

according to the color theory devised by O. Witt, a substance containing chromophores—groups of atoms responsible for the coloration of various compounds. The term was also used to designate colorless substances found in animal and plant tissues that become pigments as a result of oxidation. V. I. Palladin proposed the term “respiratory chromogen” as part of his theory of plant respiration in reference to substances that become pigments through reversible oxidation. The equivalent Russian term is no longer used in the literature.

References in periodicals archive ?
Biotin would bond with horseradish peroxide enzymes and DAB chromogen and forms brown-colored complex at that bond.
The amount of sandwiched histidine proteins was proportional to the color intensity following the addition of a chromogen substrate into the ELISA wells.
Diaminobenzidinetetrahydrochloride (Fluka Chemie GmbH, Buchs, Switzerland) was used as chromogen, and slides were counterstained with Papanicolaou solution (Merck GmbH, Darmstadt, Germany).
In addition, Harlequin Listeria Chromogenic Agar uses a novel chromogen to distinguish L.
This dual chromogen medium enables the isolation of salmonella (including Salmonella typhi and S.
Chromogen was added to the sections for 5 minutes to give color to the antigens and sections were again washed with TBS.
Briefly, 20 ul of serum sample (or standard, 6-hydroxy-2,5,7,8- tetramethylchroman-2-carboxylic acid) was incubated with 1 ml of chromogen (consisting of metmyoglobin and ABTS(r)) at 37degC in a cuvette in temperature-controlled spectrophotometer.
In the Morgan-Elson reaction the NAG in the reducing end is successfully transformed into a chromogen under alkaline condition at 100[degrees] C and subsequently by the action of p-dimethyl amino benzaldehyde (p-DMAB) in glacial acetic acid and hydrochloric acid mixture (9:1; v/v) to give a reddish purple colored product that can be detected at 585 nm.
Diaminobenzidine tetrahydrochloride was used as a chromogen to localise the peroxidase.
Assessment of chromogen suitability in ELISA for the detection of anaplasmosis and tripanosomosis.
TNF-[alpha] and NF-[kappa]B were visualized with the chromogen 3,3 diaminobenzidine (DAB) and counterstained with Harry's hematoxylin, mounted, and assessed by light microscopy.