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Nitrogen analysis

Almost all food and animal feed contains nitrogen/protein. The protein content is calculated from the percentage of nitrogen determined in a sample, and it is a key criterion for the quality and price of a product. This means that this analysis is very important to the food and animal feed industry.

After analytical testing, products are labelled with the relevant nutritional information for consumers. This declaration is subject to mandatory regulations in national and international laws for producers.

The method of Johan Kjeldahl

A high degree of precision and universality make the Kjeldahl method the world’s leading standard method for determining the nitrogen content in food and feedstuffs as well as in soil and water samples. It can be used flexibly and universally, including with inhomogeneous sample material, and always provides reliable results.

See Kjeldahl Analysis Systems

C. Gerhardt compendium: The Johan Kjeldahl Method (PDF)

DUMATHERM® N Pro from Gerhardt Analytical Systems

The method of Jean Dumas

In addition to the Kjeldahl method, the Dumas combustion method has become established as a further reference method since the 1980s.
The Dumas method is a fast and convenient alternative to the Kjeldahl method for almost all solid and liquid samples.

See Dumas analysis system

C. Gerhardt Compendium: The method of Jean Dumas (PDF)