Trisodium citrate is a tribasic salt of citric acid. It is produced by complete neutralisation of citric acid with high purity sodium hydroxide or carbonate and subsequent crystallisation and dehydration. Due to its low water content it does not add water to the formulation. It has even the excellent ability to take up surplus water from moisture sensitive formulations thus providing better shelf life to the end product. Trisodium citrate anhydrous occurs as white, granular crystals or as white, crystalline powder. It is freely soluble in water and practically insoluble in ethanol (96 %). It is a non-toxic, neutral salt with low reactivity. It is chemically stable if stored at ambient temperatures. Trisodium citrate anhydrous is fully biodegradable and can be disposed of with regular waste or sewage.
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