Method for the purification of recombinant proteins using oil body proteins

A method for the purification of recombinant proteins produced by a first genetically engineered organism, the method comprising the following steps;

• Providing the first genetically engineered organism expressing the recombinant proteins or a part thereof;
• Mixing the first genetically engineered organism or part thereof with oil body proteins which are not obtained from the first engineered organism, wherein the recombinant proteins and/or the oil body proteins are fused with an affinity ligand which allows forming complexes comprising the oil body proteins and the recombinant proteins;
• Recovering the complexes comprising the oil body proteins and the recombinant proteins by flotation of the mix.