title: Detection of arsanilic acid in animal feeds.
abstract: The animal feed sample is extracted with alcohol, the extract is evaporated to a small volume, and an aliquot is spotted on a silica gel H plate. After development of the plate in chloroform-methanol (80+20), the spotting area is scraped and extracted with ethanol, which is evaporated to dryness. The residue is dissolved in 3 ml alcohol, and an aliquot is reacted with p-dimethylaminobenzaldehyde solution; another aliquot of the extract is used as a sample blank. A control is prepared by spiking another portion of the same feed with about 5 ppm arsanilic acid. The method is applicable in the presence of procaine and sulfonamides.
mesh_terms: D000814:Aniline Compounds / Q000032:analysis; D000821:Animal Feed / Q000032:analysis*; D001152:Arsenicals / Q000032:analysis*; D008722:Methods; D012997:Solvents
chemical_list: D000814:Aniline Compounds; D001152:Arsenicals; D012997:Solvents