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2,4-Diaminotoluene definition: A synthetic, colorless to brown crystalline solid that is soluble in water, ethanol, ether and benzene. It is used primarily as an intermediate in the production of toluene diisocyanate, which is used to produce polyurethane. Small amounts of 2,4-diaminotoluene are also used to produce dyes for textiles, leathers, furs, and wood and biological stains. When heated to decomposition, it emits toxic fumes of nitrogen oxides. The primary routes of potential human exposure to 2,4-diaminotoluene are dermal contact and inhalation. Contact with this chemical can irritate the eyes and skin. It is reasonably anticipated to be a human carcinogen. (NCI05)
 
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The aromatic amines 2,4-diaminotoluene (2,4-DAT) and 2,6-diaminotoluene (2,6-DAT) are structural isomers that have been extensively studied for their mutagenic and carcinogenic characteristics.

M L Cunningham et al.

Environmental Health Perspectives 104 (Suppl 3), 01 May 1996

Both compounds are rapidly absorbed after oral administration and are equally mutagenic in the Ames test; however, 2,4-DAT is a potent hepatocarcinogen, whereas 2,6-DAT does not produce an increased incidence of tumors in rats or mice at similar doses.

M L Cunningham et al.

Environmental Health Perspectives 104 (Suppl 3), 01 May 1996

Our studies were designed to determine whether the Big Blue system could be used to detect differences in the vivo mutagenic activity between the carcinogen-noncarcinogen pair 2,4-DAT and 2,6-DAT and to determine whether the in vivo mutagenesis assay results correspond to the rodent carcinogen bioassay results.

M L Cunningham et al.

Environmental Health Perspectives 104 (Suppl 3), 01 May 1996

Male B6C3F1 transgenic mice were exposed to 2,4-DAT or 2,6-DAT at 0 or 1,000 ppm in the diet for 30 and 90 days or to dimethylnitrosamine as a positive control.

M L Cunningham et al.

Environmental Health Perspectives 104 (Suppl 3), 01 May 1996

Mutant frequencies were nearly identical for all three groups at 30 days, while at 90 days the mutant frequency for the hepatocarcinogen 2,4-DAT (12.1 +/- 1.4 x 10(-5)) was significantly higher (p < 0.01) as compared to both age-matched (spontaneous) controls (5.7 +/- 2.9 x 10(-5)) and the 2,6-DAT-exposed group (5.7 +/- 2.4 x 10(-5)).

M L Cunningham et al.

Environmental Health Perspectives 104 (Suppl 3), 01 May 1996