chromogen


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Related to chromogen: Auxochrome

chromogen

 [kro´mo-jen]
any substance, itself without color, giving origin to a coloring matter.

chro·mo·gen

(krō'mō-jen),
1. A substance, itself without definite color, which may be transformed into a pigment; denoting especially benzene and its homologues toluene, xylene, quinone, naphthalene, and anthracene, from which the aniline dyes are manufactured.
2. A microorganism that produces pigment.
3. A compound, containing a chromophore, which is colorless if that chromophore is removed.

chromogen

(krō′mə-jən)
n.
1. Chemistry A substance capable of conversion into a pigment or dye.
2. Biology A strongly pigmented or pigment-generating organelle, organ, or microorganism.

chro′mo·gen′ic (-jĕn′ĭk) adj.

chromogen

Chromagen A chemical or compound that reacts to produce a colored end-product, used to detect the presence of a substance of interest; chromogens are critical detectors in immunoenzymatic reactions. See Porter-Silber chromagen.

chro·mo·gen

(krō'mō-jen)
1. A substance, itself without definite color, which may be transformed into a pigment.
2. A microorganism that produces pigment.
References in periodicals archive ?
Extrinsic tooth staining can be caused by compounds that are incorporated into the pellicle and produce a stain consequently to their basic color (chromogen), or those that lead to staining caused by chemical interaction at the tooth surface, which is usually associated with cationic antiseptics and metal salts.
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.
Fe[Cl.sub.3] produce CCI only with (-OH) chalcones, while NaB[H.sub.4]-HCl and [Ac.sub.2]O-[H.sub.2]S[O.sub.4] reagents indicate that the chromogen involved in formation CCI of chalcone is (Ar-CO-CH=CH-Ar).
Protein expression was visualized using diaminobenzidine as chromogen. The relative gray values of corresponding bands and [beta]-actin were then semi-quantified and compared by Scion Image analysis software.
TEAC is a spectrophotometric technique that measures the relative ability of hydrogen-donating antioxidants to scavenge the 2, 2'-azino-bis3-ethylbenzthiazoline-6-sulfonic (ABTS+) radical cation chromogen in relation to that of Trolox, the water soluble vitamin E analogue, which is used as an antioxidant standard.
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.
The immunoperoxidase stain used was a commercial rabbit polyclonal antibody (BioRelience Corp., Rockville, MD, USA) with peroxidase-tagged goat antirabbit immunoglobulin G (DakoCytomation, Carpinteria, CA, USA) bridge and 3-amino-9-ethylcarbazole (DakoCytomation) as the chromogen. This staining demonstrated abundant WNV antigen within the cytoplasm of a small number of neurons and glial cells and in fewer macrophages in the brain tissue (Figure).
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.