Color developing agents

Stabilizers. Nitro alcohols can be used to prevent the decomposition of phenylenediarnine color-developing agents (27). 2-Hydroxymethyl-2-nitro-l,3-propanediol and 2-nitro-1-butanol have been used as additives for the stabilization of 1,1,1-trichloroethane. 

Figure 5. Typical p-phenyl-enediamine color developing agents, known as CD1-CD4 in the photographic industry.

Typical p-phenylenediamine color developing agents are shown in Figure 5. 

The third reaction of the sequence is the silver-catalyzed oxidation of color developing agent which leads to dye formation by coupling as in normal color development. This process allows a lowering of the coated silver level but still produces a full-density color image (Figure 16). Typically the coated silver level is 10 % of that required for normal color development, which means that 90 % of the dye image is formed by the RX amplification reaction. 

Nipaben ipaLabs] Ben xvaben color develop agent for heat-sensitive recording papers. 

Synonyms N,N-diethyl-2-methyl-i,4-phenylene-diamine hydrochloride N4,N4-diethyl-2-methyl-i,4-benzenediamine monohydro-cnloride 4-N,N-diethyl-2-methyl-p-phenylenediamine monohydrochloride 2-amino-5-diethylaminotoluene monohydrochloride CD-2 Uses color-developing agent color developer for Eastman print and Gevacolor color-development baths A... 

Synonyms 2-[(4-amino-3-methylphenyl)ethylamino] ethanol sulfate (1 1) (salt) N5-ethyl-N5-(2 -hydroxyethyl)toluene-2,5-diammo-nium sulfate 4-(N-ethyl-N-2-hydroxyethyl)-2-methylphenylenediamine sulfate color-developing agent CD-4 Uses color developer for Kodacolor II film, identical to Flexicolor or C-41 process color developer for use in color microautoradiography for color development of immunogold-labeled antibodies A... 

Colloidal instability, 2335 Colloidal stability, 2342 Colon, 4118, 4120,4127,4133,4136 Colon adenocarcinmna, 1836 Colon cancer (CCa), 2403, 3485 incidence, 2409 mOTtality, 2409 Colon cancer cell, 3485 Colon tissues, 2295 Color, 1755, 1807, 2343,2350 Color-developing agents, 3314 Colorectal cancer, 2302 Colpomenia... 

These reagents are required for proper color development. Hydroxylamine hydrochloride is a reducing agent, which is required to keep the iron in the +2 state. The o-phenanthroline is a ligand that reacts with Fe2+ to form an orange-colored complex ion. This ion is the absorbing species. In addition, since the reaction is pH dependent, sodium acetate is needed for buffering at the optimum pH. 

The principle behind the test method(s) is that antibodies are made of proteins that recognize and bind with foreign substances (antigens) that invade host animals. Synthetic antibodies have been developed to complex with petroleum constituents. The antibodies are immobilized on the walls of a special ceU or filter membrane. Water samples are added directly to the cell, while soils must be extracted before analysis. A known amount of labeled analyte (typically, an enzyme with an affinity for the antibody) is added after the sample. The sample analytes compete with the enzyme-labeled analytes for sites on the antibodies. After equilibrium is established, the cell is washed to remove any um-eacted sample or labeled enzyme. Color development reagents that react with the labeled enzyme are added. A solution that stops color development is added at a specified time, and the optical density (color intensity) is measured. Because the coloring agent reacts with the labeled enzyme, samples with high optical density contain low concentrations of analytes. Concentration is inversely proportional to optical density. 

Kanner, J., and Juven, B. J. (1980). S-NitrosiKysteine as an antioxidant, color-developing, and anticlostridial agent in comminuted turkey meat. J. Food Sci. 45, 1105-1108 and 1112. 

Benzofuran derivatives such as 2-cyanobenzofuran-5-sulfonic acid esters and amides have found wide application as color developers in photographic processes (44USP2350127). The substituted benzofurans (507), (508) and (509) are used as brightening agents in textiles, wool, paper, cellulose and nylon (53MI31201). 

Benzenediamine also is an effective developing agent, but it may cause dermatitis in sensitive individuals. (V,N-Diethyl-l,4-benzenediamine is used as a developer in color photography. These substances react with silver bromide to produce benzenediimine derivatives ... 

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