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  4. 167 Determination of crude protein in grain and grain products for food and feed by the Dumas Combustion Principle

167 Determination of crude protein in grain and grain products for food and feed by the Dumas Combustion Principle

Methods Type: Generic Methods
Key data
Number: 167
Analyte: Crude Protein (Dumas Combustion Principle)
Matrix: Grain and Grain Products for Food and Feed
Year of Approval: 2000
Scope: The measurement of the total nitrogen content in grain and grain products and, by calculation, protein content.
Principle: 
  • The sample is combusted in an oxygen-rich environment, at about 1000° C, to give oxides of nitrogen which are catalytically reduced to nitrogen. Other products resulting from the combustion phase are removed by selective absorption.
  • Nitrogen gas is measured with a thermal conductivity detector.
  • Total nitrogen is calculated from the detector response. The detector is calibrated with a known nitrogen standard.
  • Automatic combustion analysers rely on a carrier gas, such as helium or carbon dioxide.

Definition

Crude protein is a conventional expression of the total content of nitrogen compounds of the analysed product, calculated by multiplying the corresponding nitrogen content by a conversion factor.

 

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