Nitrogen source feeding fermentation process for producing gellan gum

A fermentation process for producing a gellan gum, comprising the following steps:

• 1) inoculating a culture medium with a strain capable of producing a gellan gum to form a broth;
• and
• 2) initiating a fermentation, and feeding a nitrogen source into the broth during the fermentation;
• wherein the strain capable of producing the gellan gum is selected from a group consisting of Sphingomonas paucimobilis, Sphingomonas Azotofigens, and Sphingomonas elodea:
• wherein the nitrogen source is fed into the broth during the fermentation after inoculation with the strain according to FIG. 1 feeding curve diagram, which falls into the shaded area of FIG. 1;
• wherein a total amount of the nitrogen source fed into the broth is 0.01 mol/L to 0.1 mol/L calculated as the nitrogen element in the broth in relative to the total volume of the broth.