Process for the preparation of a mixture of starch branching enzymes extracted from algae

The invention concerns a method for obtaining a mixture of starch branching enzymes extracted from unicellular algae characterised in that it consists in modifying a unicellular algae such that it no longer expresses a starch debranching activity; in treating said modified unicellular algae so as to obtain a concentrated acellular extract; and in subjecting said concentrated acellular extract to molecular sieving so as to obtain a mixture of starch branching enzymes extracted from algae.