The Kjeldahl process is an established method which is widely used for all kinds of food samples but also for environmental, chemical and pharmaceutical samples. It involves a digestion step to decompose proteins and other nitrogen-containing species and is followed by steam distillation to isolate the ammonia for nitrogen quantification. Proteins are some of the most important nutritional components and are present in almost all food and animal feed products, where they serve as a reliable quality feature. For food products, the protein content must be declared on the product nutritional information for consumers.This declaration is statutory in national and international laws for food producers. By determining the Total Kjeldahl Nitrogen (TKN), the protein content is calculated directly from the nitrogen present in the sample.
 

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