Sodium carboxymethyl cellulose (CMC) and xanthan gum are both commonly used as thickening agents and stabilizers in a variety of industries. However, there are some differences between the two:

1. Chemical composition: CMC is a cellulose derivative, whereas xanthan gum is a polysaccharide derived from the fermentation of a bacterium called Xanthomonas campestris.
2. Solubility: CMC is soluble in cold water, whereas xanthan gum is soluble in both hot and cold water.
3. Viscosity: CMC has a higher viscosity than xanthan gum, meaning it thickens liquids more effectively.
4. Synergy: CMC can work in synergy with other thickeners, whereas xanthan gum tends to work better alone.
5. Sensory properties: Xanthan gum has a slimy or slippery mouthfeel, whereas CMC has a more smooth and creamy texture.

Overall, both CMC and xanthan gum are effective thickeners and stabilizers, but they have different properties and are used in different applications. CMC is commonly used in food, pharmaceuticals, and cosmetics, while xanthan gum is often used in food and personal care products.