Nitrogen Determination in Pharmaceutical Active Peptides
Nitrogen and total protein determination in pharmaceutical products are described in the European Pharmacopoeia (Ph.Eur.) section 2.5.9 and 2.5.33 method 7 [1, 2]. In the Pharmacopoeia of the United States (USP), nitrogen determination is described in section 461 [3]. Therein, different titration techniques are specified. The Ph.Eur. describes back titration in the presence of the indicator methyl red mixed solution and the USP potentiometric boric acid titration.
Nitrogen & protein determination in feed
An easy and reliable method for the determination of total nitrogen and protein in animal feed products according to the Kjeldahl method is introduced. The determination of nitrogen and protein in animal feed products using the SpeedDigester K-439 and Kjel Line systems with colorimetric titration provides reliable and reproducible results. These results correspond well to the certified reference values with low relative standard deviations.