100% Pure Xanthan Gum Powder (e415) for use in molecular gastronomy. Xanthan Gum is a long chain polysaccharide composed of the sugars glucose, mannose, and glucuronic acid. It is used as a thickener in sauces, as an agent in ice cream that prevents ice crystals from forming, and as a fat substitute that adds the "mouth feel" of fat without the calories. Xanthan gum is also commonly used in gluten free baking, and has synergies with a variety of other gums.