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  • Title: Collaborative study of a semiautomated method for the determination of crude protein in animal feeds.
    Author: Noel RJ, Hambleton LG.
    Journal: J Assoc Off Anal Chem; 1976 Jan; 59(1):134-40. PubMed ID: 1249027.
    Abstract:
    A semiautomated method consisting of digestion of animal feeds in a block digestor and determination of ammonia by ammonia-salicylate reaction has been studied collaboratively, along with the official final action Kjeldahl method, sec. 7.016. Each collaborator analyzed 16 feed samples, tryptophan, ammonium dihydrogen phosphate NBS standard, and ammonium sulfate primary standard. Statistical analysis showed that the 2 methods agreed. The semiautomated method has been adopted as official first action.
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