1.Description

Chemical Formula: Na₃C₆H₅O₇
CAS Number: 6132-04-3 (dihydrate), 68-04-2 (anhydrous)
Sodium citrate is the sodium salt of citric acid, a natural organic acid found in citrus fruits. It is produced commercially through the fermentation of carbohydrates and subsequent neutralization. Commonly encountered as a white, crystalline powder or granular solid, it is non-toxic, biodegradable, and exhibits a pleasant, slightly salty-sour taste.

2.Industrial Applications

2.1 Food and Beverage Industry

Acidity Regulator & Buffer (E331): Controls and stabilizes pH in jams, jellies, dairy products, soft drinks, and packaged foods.
Emulsifying Salt: Prevents fat separation in processed cheeses and dairy spreads.
Flavor Enhancer: Adds a mild tartness and enhances the perception of sweetness in beverages and confectionery.
Preservative: Extends shelf life by inhibiting oxidation and microbial growth.

2.2 Pharmaceuticals and Medicine

Anticoagulant: Used in blood collection tubes (e.g., blue-top tubes) and during procedures like hemodialysis to prevent clotting.
Alkalizing Agent: An ingredient in solutions used to treat metabolic acidosis or urinary tract infections.
Laxative: Used in certain bowel evacuation preparations.

2.3 Cleaning and Detergents

Builder and Chelating Agent: An environmentally friendly phosphate-free alternative in detergents and dishwashing products to soften water by sequestering hardness ions.
Degreaser: Effective in industrial and household cleaning formulations.

2.4 Other Industrial Uses

Cosmetics/Personal Care: Acts as a pH adjuster and chelator in creams, gels, and bath products.
Biotechnology & Molecular Biology: A component in buffer solutions (e.g., SSC buffer) for DNA and RNA analysis.