METHOD FOR POST-EXTRACTING LOW ACYL GELLAN GUM

摘要

Method for post-extracting low-acyl gellan gum comprises steps: deacetylating of gellan gum fermentation broth, enzyme treating, flocculating the low-acyl gellan gum with bivalent or multivalent metal cations, clarifying the gellan gum solution, dewatering the gellan gum solution, removing bivalent or multivalent cations and decoloring, and drying and crushing. As preferred, chelating agent/acid system of appropriate amount may be also added before the step of drying and crushing, so as to chelate bivalent cations which may be introduced additionally in the use of gellen gum, and keep pH in relatively stable value at the same time. Various low-acyl gellan gums prepared by above method are also provided, which have features of good appearance, high transmittance, high gel strength, and have specific performance of color value of more than 83%, transmittance of more than 85%, and gel strength of more than 400g/ cm2.