Patent ID: 8652549

Claim:
A post extraction process for preparing low acyl gellan gum having high solubility property, the process comprises the following steps: (1) Enzyme treatment of fermentation broth: Into the fermentation broth, different enzymes preparations are added and the temperatures are kept to conduct the zymolysises; (2) Flocculation of fermentation broth: Into the fermentation broth treated by enzymes in Step (1), an acid/chelating agent/lower alcohol mixture system is added to flocculate, and then a solid-liquid separation is conducted; (3) Deacylation treatment: The flocculate obtained in Step (2) is re-dissolved, and subjected to deacylation treatment via high temperature and base; (4) Clarification treatment of deacylated solution: The deacylated solution obtained in Step (3) is subjected to a filtration treatment, and a clarified low acyl gellan gum solution is obtained; (5) Dehydration treatment of clarified deacylated gellan gum solution: Into the clarified deacylated gellan gum solution obtained in Step (4), an alkali salt is added to form a gel, and the gel is pressed to dehydrate; (6) Ion exchange and decoloration treatment: The gellan gum obtained in Step (5) are cut into grains, and most of the divalent cations in the gellan gum are removed via ion exchange, and the treated solution is pressed to dehydrate and the dehydrated gellan gum is immersed with lower alcohol under agitation, and subjected to a filtration; (7) Drying and milling: The solid material of gellan gum obtained in Step (6) is dried and milled and granulated.