A method for preparing a liquid nisin composition for food preservation

摘要

590410 Disclosed is a method for preparing a liquid nisin composition, comprising the steps of: (a) mixing powder nisin with an aqueous solution to prepare a first liquid nisin containing composition having a pH of 3.5 to 12 and a final inorganic salt concentration of 1.5 M or below; (b) isolating solid compounds from the prepared first liquid nisin containing composition by centrifugation, filtration or any combination thereof; (c) contacting the isolated solid compounds with a solution having a pH of 1 to 3 to prepare a second liquid nisin composition; and optionally (d) removing solid compounds from the second liquid nisin composition and / or e) adjusting the pH of the second liquid nisin composition to a pH between 2 and 6. Also disclosed is the use of a liquid nisin composition as prepared above for use as a preservative for food, feed or agricultural products. A method for producing a solid nisin composition comprising the step of subjecting a liquid composition as prepared above, to a drying step, Iyophilisation step, crystallisation step or precipitation step.