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Ingredient Glossary - X
xanthan gum: Used as a food additive. It is produced by a process involving fermentation of glucose or sucrose by the Xanthomonas campestris bacterium. Xanthomonas campestris is the same bacteria responsible for causing black rot to form on broccoli, cauliflower and other leafy vegetables. The bacteria form a slimy substance which acts as a natural stabilizer or thickener. Xanthan gum is used in dairy products and salad dressings as a thickening agent and stabilizer. Xanthan gum prevents ice crystals from forming in ice creams, and also provides a 'fat feel' in low or no-fat dairy products. One of the most remarkable properties of xanthan gum is its capability of producing a large increase in the viscosity of a liquid by adding a very small quantity of gum. It helps to stabilize the colloidal oil and solid components against creaming by acting as an emulsifier. Xanthan gum makes it thick enough at rest in the bottle to keep the mixture fairly homogeneous, but the shear forces generated by shaking and pouring thins it so it can be easily poured. When it exits the bottle, the shear forces are removed and it thickens back up so it clings to the salad. Unlike other gums, it is very stable under a wide range of temperatures and pH. Also used in frozen foods and beverages, xanthan gum creates the pleasant texture in many ice creams. Toothpaste often contains xanthan gum, where it serves as a binder to keep the product uniform. Xanthan gum is also used in gluten-free baking. Since the gluten (found in wheat) must be omitted, xanthan gum is used to give the dough or batter a "stickiness" that would otherwise be achieved with the gluten. Xanthan gum also helps thicken commercial egg substitutes made from egg whites to replace the fat and emulsifiers found in yolks. It is also a preferred method of thickening liquids for those with swallowing disorders, since it does not change the color or flavor of foods or beverages. One lesser-known use of xanthan gum is in the oil industry. Oil companies often use water as a lubricant for oil well pumps, but regular water is not very thick. A natural thickener such as guar gum or xanthan gum can be added to the water in order to increase its viscosity, or thickness. You could think of this as turning tap water into 10W-40 motor oil. The thickened water keeps the drill parts lubricated and displaces more of the natural oil found in the deposit area.
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