2. Xanthan gum is an extracellular microbial polysaccharide produced by Xanthomonas campestris fermentation, which can be used as emulsifier, stabilizer and gel thickener. Xanthan gum can be widely used in many industries, such as food, medicine and cosmetics. In these industries, it is often used to improve the taste of food, control drug release and improve the viscosity of cosmetics. , and usually does not cause harm to the human body.