Diphenylamine


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diphenylamine

[dī¦fen·əl′am‚ēn]
(organic chemistry)
(C6H5)2NH Colorless leaflets, sparingly soluble in water; melting point 54°C; used as an additive in propellants to increase the storage life by neutralizing the acid products formed upon decomposition of the nitrocellulose. Also known as phenylaniline.

Diphenylamine

 

an aromatic amine, C6H5NHC6H5; colorless crystals that darken upon exposure to light and have a slight characteristic odor. Melting point, 54°C; boiling point, 302°C. It is insoluble in water but soluble in most organic solvents. In industry, it is made by heating aniline, C6H5NH2, with aniline hydrochloride at 200°-230°C. It is used to make dyes and numerous organic intermediates (acridine, carbazole, and others), for stabilizing cellulose nitrate powders, and in colorimetric determination of some oxidizing agents (for example, nitric and nitrous acids).

References in periodicals archive ?
In addition to the pilot test to validate the technology in the field, the team evaluated the quantities of diphenylamine, or DPA, present on a treated apple.
Five redox indicators (2,3'-diphenylamine dicar-boxylic acid, diphenylaminesulfonic acid, diphenylamine, iodine:starch, and luminol) were evaluated against hydrogen peroxide and potassium chlorate.
160 [micro]l of freshly prepared diphenylamine (150mg diphenylamine in 10ml glacial acetic, 150[micro]l concentrated [H.sub.2]S[O.sub.4] and 50[micro]l of acetaldehyde solution) was added and the tubes were allowed to stand overnight at room temperature to develop colour.
That finding, in turn, has led to 1-MCP's use as an alternative to preventing apple scald with diphenylamine, a chemical antioxidant that requires close monitoring.
Treating apples with the chemical antioxidant diphenylamine can prevent scald, but the practice can be complicated and requires careful monitoring.
In the past, colorimetric or fluorometric assays used reagents such as diphenylamine, which when added to the patient's plasma/serum produced a color change, the degree of which correlated with the DNA concentration (57-59).
Nitrate in plant tissue can also be sampled by a simple test using diphenylamine. The diphenylamine reacts with N[O.sub.3.sup.-] in plant tissue to form a blue color, the intensity of which varies with the amount of N[O.sub.3.sup.-] present.
Some of the more common stabilizers used to extend the safe life of the energetics are diphenylamine, methyl centralite, and ethyl centralite.
In the non-organic apples, tests found 0.13mg/kg of the fungicide diphenylamine. The legal maximum residue level (MRL) limit set by the Pesticides Safety Directorate (PSD) for this chemical is 5mg/kg, so the traces found are negligible.