CAS Registry Number: [18996-35-5]
Chemical Formula: C6H7O7Na
E-Number: E331
General Information
Monosodium citrate is a monobasic salt of citric acid and is produced by partial neutralization of citric acid with a high purity sodium source and subsequent crystallization. It is supplied as anhydrous material. As partially neutralized salt it occupies an intermediate position between citric acid and the neutral or weakly alkaline trisodium citrate. Monosodium citrate is used if a buffering effect is required or if citric acid is considered to be too aggressive for the formulation. Monosodium citrate is also less hygroscopic than citric acid, thus less prone to caking and preferred in critical formulations such as dry blends, instant preparations or tablets.
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