title: Collaborative study of an automated method for the determination of crude protein in animal feeds.
abstract: An automated macro Kjeldahl instrument determines per cent protein at the rate of 20 samples/hr. The methodology involved is similar to the present official final action Kjeldahl method, sec. 7.016. The 2 methods were compared in a collaborative study. Sixteen animal feeds, 4 meats, tryptophan, ammonium dihydrogen phosphate NBS standard, and ammonium sulfate primary standard were analyzed by the participating laboratories. The data were agreement between the 2 methods. The automated method has been adopted as official first action for the determination of crude protein in feeds, plants, and cereal foods.
mesh_terms: D000645:Ammonium Sulfate / Q000032:analysis; D000821:Animal Feed / Q000032:analysis*; D001322:Autoanalysis / Q000379:methods; D002523:Edible Grain / Q000032:analysis; D010940:Plant Proteins / Q000032:analysis; D011506:Proteins / Q000032:analysis*
chemical_list: D010940:Plant Proteins; D011506:Proteins; D000645:Ammonium Sulfate