Gellan gum is one of the most expensive hydrocolloids . Xanthan gum is a polysaccharide secreted by the bacterium Xanthomonas campestris used as a stabilizer and food-thickening agent. It is composed of pentasaccharide repeat units, comprising mannose, glucose, and glucuronic acid.
Gellan gum is a viscous soluble fiber, artificially produced by non-pathogenic bacteria Sphingomonas elodea from lactose (cheese whey) or glucose (corn starch). It is an indigestible carbohydrate, a mixture of polysaccharides composed of glucose, rhamnose and glucuronic acid.