Sodium citrate is a versatile compound widely used in food, industrial, and medical applications. In the food industry, it serves as a preservative to extend shelf life by inhibiting spoilage and microbial growth, a pH regulator to maintain proper acidity, and a buffering agent that stabilizes food formulations[1]. It is especially valued in processed cheese, cheese sauces, and spreads for improving meltability and creating smooth, creamy textures by emulsifying fats and proteins, ensuring cheese melts evenly without becoming greasy[4]. In addition, sodium citrate facilitates gel formation and innovative textures in molecular gastronomy, enhances stability and flavor in beverages, and maintains color and consistency in bakery, canning, and pickling products[1].
Beyond food, sodium citrate is a key ingredient in cleaning products, softening water by binding calcium and magnesium ions to improve detergent efficiency. Industrial uses include cleaning and descaling metal surfaces in boilers and heat exchangers, and regulating pH in textile dye baths for better color fastness[1]. Sodium citrate is also found in photographic solutions to control pH, and in laboratories as a buffering agent for chemical reactions and analysis[1].
Medically, sodium citrate is crucial as an anticoagulant, preventing blood clotting during storage for transfusions and in tubes used for blood testing; it does so by binding calcium ions, essential for coagulation[5]. It also acts as an alkalinizing agent, treating metabolic acidosis and chronic kidney disease by neutralizing excess acids in the blood and urine[5].
Other notable uses include helping with water retention and preserving color and juiciness in meats, enhancing the gel texture and stability of jams and jellies, and functioning as an emulsifier and acidity regulator in a wide range of beverages—from soft drinks to electrolyte and energy drinks[3].
Sodium citrate is generally recognized as safe (GRAS) by food safety authorities, including the FDA and EFSA, as long as it’s used within recommended levels in food and beverage products[4].
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