Xanthan gum, also known as Hansheng gum, is a widely used microbial extracellular polysaccharide produced by Xanthomnas campestris, a wild rapeseed bacterium, through fermentation engineering using carbohydrates as the main raw material (such as corn starch). It has unique rheological properties, good water solubility, thermal and acid-base stability, and good compatibility with various salts. As a thickener, suspension agent, emulsifier, stabilizer, it can be widely used in more than 20 industries such as food, petroleum, and medicine. It is currently the largest and most widely used microbial polysaccharide in the world.