[Technological directions for processing rape proteins into protein concentrates and isolates]

Rape-seeds or rape-seed meal are relatively cheap, but valuable raw materials for the manufacture of protein concentrates and isolates which may be used as constituents of foodstuffs. The high content of crude fibres and also of thioglucosides leads to considerable difficulties in the development of techniques for the manufacture of high-grade protein preparations. To describe the procedure, certain production-technological properties of rape proteins are discussed, such as extraction parameters, coagulating conditions, processing temperature, amount of solvent, etc. On the basis of these data, the following techniques for the manufacture of rape protein products are presented: - protein concentration by means of the water diffusion method; - protein isolation with the aid of one or multi-stage extraction. Finally, the author reports of a fermenting procedure for the manufacture of protein biomass from coarse colza meal. Furthermore, he presents some data about the nutritional value of rape protein.