Kjeldahl Determining Nitrogen
The process determines nitrogen and proteins in organic materials. In the Kjeldahl method, the boiling point of sulfuric acid of 337 degrees Celsius is increased by means of catalysts. Approx. 380 ° C is the optimum decomposition temperature for organic materials in sulfuric acid. The protein content is determined by multiplying the analytically determined nitrogen content by a factor of 6.25, in the case of wheat and semolina flour by a factor of 5.7. The nitrogen content is determined by the Kjeldahl method in 4 stages.