xanthan

Xanthan gum is a polysaccharide derived from the bacterium Xanthomonas campestris, produced through controlled fermentation of glucose or sucrose. This naturally occurring biopolymer was discovered in the 1950s during research at the U.S. Department of Agriculture and is now manufactured through the microbial fermentation of carbohydrates, followed by precipitation, washing, and drying to yield a fine, off-white powder. The molecular structure consists of a glucose backbone with trisaccharide side chains, conferring unique rheological properties that allow it to function as an effective thickening and stabilizing agent even at very low concentrations (0.1–1% by weight). Xanthan gum exhibits pseudoplastic behavior, meaning it becomes less viscous when subjected to mechanical stress and returns to its original thickness when the stress is removed.

Xanthan gum is widely used in food manufacturing and home cooking as a thickener, stabilizer, and emulsifier in a broad range of products including sauces, dressings, beverages, ice cream, and baked goods. It is particularly valued in gluten-free baking, where it mimics the binding and structural properties of gluten by creating a cohesive network that improves texture and prevents excessive crumbling. In salad dressings and vinaigrettes, it prevents separation of oil and aqueous components while maintaining a light, fluid consistency at low concentrations. Xanthan gum is also employed in molecular gastronomy for creating gels, foams, and spheres, and is essential in low-fat and reduced-calorie formulations where it compensates for lost viscosity and mouthfeel without adding calories. It readily disperses in cold liquids without clumping when properly hydrated and is stable across a wide pH range, making it versatile across savory and sweet applications.