procedures for the extraction of virgin mikrobiellem protein with a low nucleinsaeuregehalt, as is nahrungsoder feed

摘要

Cell material consisting of unicellular microorganisms is ground in the form of a 1-25% suspension with the addition of alkaline substances (pref. NaOH) at pH 9-14 at 0-40 degrees C, the cell walls are separated off at pH 7-9, the protein is precipitated by acidifying at pH 2-7 and the protein is centrifuged off, dried extracted with alcohol to remove lipids, and again dried to give protein having a low nucleic and content which is utilisable as a food- or feedstuff. In the above procedure, nuclease is released during the grinding process so that nucleic acids are broken down to nucleotides which are not precipitated with the protein. The protein obtained is more easily and has a higher biological value than protein contained in intact cells.