PREPARATION OF RAPESEED PROTEIN ISOLATES. Precipitation of Rapeseed Proteins in the Presence of Polyacids.

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Abstract
The precipitation of alkaline extracted rapeseed proteins by addition of acid in the presence of different acidic polymers have been studied. The yield and the nitrogen and dry matter contents of the isolates were found to depend on the ionic composition of the extract, the nature and amount of added polymer and the pH of precipitation. The acidic polymers studied were hexametaphosphate, CMC of different DP and DS, polygalactouronic acid, alginate and kappa‐, iota‐ and lambda‐carrageenans. With all of these polymers, it was possible to obtain a quantitative or almost quantitative recovery of the dissolved proteins. Except for the carrageenans, all of the polymers produced a high increase in the dry matter content of the precipitates.