A reliable and efficient method for the determination of total nitrogen and protein in animal feed according to ISO 5983-2 and AOAC 2001.11 is presented. The samples were digested using Kjeldahl tablets, hydrogen peroxide and the KjelDigester K-449. Distillation and boric acid titration were performed with the KjelMaster System K-375 / K-376 equipped with the colorimetric sensor Optrode. According to the norms, bromocresol green / methyl red mixed indicator was added to the boric acid for the automized colorimetric titration.
Protein determination in animal feed using colorimetric titration
Protein determination in animal feed according to ISO 5983-2 and AOAC 2001.11 by digestion with Kjeldahl tablets and hydrogen peroxide followed by colorimetric titration using Optrode
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