emulsifier

Generally, any ingredient used to bind together normally noncombinative substances, such as oil and water. Egg yolks contain a natural emulsifier (lecithin) and are used to thicken and bind sauces (such as hollandaise), as well to bind ingredients in baking. xanthan gum is a commercial emulsifier used in numerous foods like salad dressings and dairy products. Some commercial emulsifiers also inhibit baked goods from going stale.

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