Determination of Crude Protein in Cereals and Cereal Products for Food and for Feed

Methods Type: 
Generic Methods
Key data
Number: 
105/2
Analyte: 
Crude Protein
Matrix: 
Cereals and Cereal Products for Food and for Feed
Year of Approval: 
1980
Year of Last Revision: 
1994
Scope: 

This method is envisaged for the determination of crude protein content in cereals and cereal products.

Principle: 

The organic matter of the sample is oxidized with concentrated sulfuric acid in the presence of a catalyst: the product of the reaction (NH4)2SO4 is treated by alkali; free ammonia is distilled and titrated.

Definition

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