Comparison of the Kjeldahl method and a combustion method for total nitrogen determination in animal feed

The features of the Dumas combustion method (CM) and those of the Kjeldahl method (KM) were compared as they apply to total nitrogen determination in animal feed. Both methods achieved similar repeatability (S.D., 0.11–0.38 from Kjeldahl and 0.15–0.36 from combustion) and similar intra-laboratory re...

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Published inTalanta (Oxford) Vol. 57; no. 5; pp. 1019 - 1026
Main Authors Marcó, Alejandro, Rubio, Roser, Compañó, Ramon, Casals, Isidre
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 03.07.2002
Oxford Elsevier
Subjects
Animal feed
Biological and medical sciences
Combustion method
Feed and pet food industries
Food industries
Fundamental and applied biological sciences. Psychology
Kjeldahl method
Total nitrogen
Kjeldahl method
Total nitrogen
Combustion method
Animal feed
Combustion
Measurement method
Comparative study
Feed
Quantitative analysis
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Summary:The features of the Dumas combustion method (CM) and those of the Kjeldahl method (KM) were compared as they apply to total nitrogen determination in animal feed. Both methods achieved similar repeatability (S.D., 0.11–0.38 from Kjeldahl and 0.15–0.36 from combustion) and similar intra-laboratory reproducibility (S.D., 0.11–0.39 from Kjeldahl and 0.15–0.37 from combustion). R.S.D. is always below 2%. These results show that the CM is suitable for the analysis of protein content in animal feed (5–75% protein content). The CM is recommended owing to its shorter analysis time, its cost and its environmental suitability.
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ISSN:0039-9140
1873-3573
DOI:10.1016/S0039-9140(02)00136-4