Overview

This International Standard specifies a method for the determination of soluble proteins in potassium hydroxide solution in soya meals, rapeseed meals and sunflower pellets, which are then assayed using the Kjeldahl method as specified in ISO 5983-1 and ISO 5983-2. The sample is dispersed in a solution of potassium hydroxide of approximately 12,5 pH, stirred and centrifuged. Then, the nitrogen content of the clarified liquid is determined by the Kjeldahl method for crude protein and compared with the value of crude protein of the original sample.
The International Standard has been prepared in ISO/TC 34/SC 2 "Oleaginous seeds and fruits and oilseed meals" (secretariat: AFNOR, France) of Technical Committee ISO/TC 34 "Food products" (secretariat: AFNOR, France). The responsible body for the European Standard is CEN/TC 307 "Oil seeds, vegetable and animal fats and oils and their by-products - Methods of sampling and analysis" (secretariat: AFNOR, France). On the national level, the standard is supervised by NA 057-05-05 AA "Gemeinschaftsausschuss für die Analytik von fetten, Ölen und Fettprodukten, verwandten Stoffen und Rohstoffen " (GA Fett) of the German Society for Fat Science (DGF) ("Joint committee for the analysis of fats, oils and products thereof, related and primary products") and DIN Standards Committee Food and Agricultural Products (NAL).

Document: references other documents

Responsible national committee

NA 057-05-05 AA - Joint committee of DIN and DGF for the analysis of fats, oils and products thereof, related and primary products  

Responsible european committee

CEN/TC 307 - Oilseeds, vegetable and animal fats and oils and their by-products - Methods of sampling and analysis  

Responsible international committee

ISO/TC 34/SC 2 - Oleaginous seeds and fruits and oilseed meals