Xanthan gum CAS 11138-66-2

Xanthan Gum 80 - Mesh **1. Definition and Particle Size** Xanthan gum is a high - molecular - weight polysaccharide. The "80 - mesh" specification refers to the particle size of the xanthan gum. Mesh size is a way to classify the fineness of powders. In the case of 80 - mesh xanthan gum, it means that the particles can pass through a sieve that has 80 openings per linear inch. Compared to finer - meshed xanthan gum, 80 - mesh xanthan gum has relatively larger particles. **2. Physical Appearance and Properties** - Appearance: 80 - mesh xanthan gum usually appears as a powder with a granular texture. The granules are visible to the naked eye and have a somewhat coarse feel compared to higher - meshed varieties. - Solubility: It is soluble in water. However, due to the relatively larger particle size, it may take a bit more time and agitation to fully dissolve compared to finer - meshed xanthan gum. When dissolved, it forms a viscous solution that can have a wide range of viscosities depending on the concentration used. **3. Rheological Properties (Flow and Viscosity)** - Viscosity: Even with the 80 - mesh particle size, xanthan gum is a powerful thickening agent. It can significantly increase the viscosity of aqueous solutions. For example, in a food - grade application, a small amount of 80 - mesh xanthan gum can thicken a sauce or a dressing to the desired consistency. The thickening effect is due to the unique molecular structure of xanthan gum, which unfolds and interacts with water molecules to form a three - dimensional network that restricts the flow of the liquid. - Flow Behavior: The flow behavior of solutions containing 80 - mesh xanthan gum can be pseudoplastic. This means that the viscosity decreases as the shear rate (the rate at which the liquid is stirred or forced through a pipe, for example) increases. This property is useful in many applications such as in the food and cosmetic industries, as it allows the product to be easily poured or spread when under shear (during application), but then regain its viscosity once the shear is removed. **4. Applications** - **Food Industry**: In the food industry, 80 - mesh xanthan gum is used for thickening and stabilizing a variety of products. For example, it can be used in salad dressings to prevent the separation of oil and water phases. It also helps in maintaining the texture of baked goods by retaining moisture. In dairy products like yogurt, it can improve the consistency and prevent syneresis (the separation of whey). - **Cosmetic Industry**: In cosmetics, it is used to thicken lotions, creams, and gels. The pseudoplastic behavior allows for easy application of products such as facial creams and hand lotions. It helps to keep the active ingredients suspended and evenly distributed throughout the product, providing a more consistent user experience. - **Industrial Applications**: In industrial settings, 80 - mesh xanthan gum can be used in oil - well drilling fluids to control the viscosity and stability of the fluid. It can also be used in the formulation of adhesives and coatings to adjust the rheological properties and improve the performance of these products.