Sodium citrate

Sodium citrate Na3C6H5O7 is a sodium salt of citric acid used as an additives,emulsifier, preservative, and pH buffer in food.
Uses
Food and culinary: Acts as an emulsifier for melting cheese, a preservative, and a flavor enhancer. It is a key ingredient for creating smooth cheese sauces, mac and cheese, and is essential for modernist cooking techniques like spherification.