CAS Registry Number: [18996-35-5]
Chemical Formula: C6H7O7Na
E-Number: E331
Characteristics
Monosodium citrate is a white, odourless, fine or crystalline granular powder with slightly acidic taste. It is easily soluble in water and practically insoluble in ethanol.
It is always used, if compared to the pure acid, a buffering effect is required (e.g. acid sensitive ingredients are present)
For preparations which are sensitive to water (e.g. sodium
bicarbonate in effervescent tablets) the anhydrous monosodium
citrate can replace water containing ingredients. Due to its high decomposition temperature (>200°C) and low water content (<0.4%), it is also the preferred acid source in baking powder or blowing agents in order to prevent premature reaction between acid and
alkaline source.
When used as endothermic blowing agent in the plastics industry, it is the preferred food grade, non-toxic alternative to exothermic blowing agents such as azo compounds (e.g. azodicarbonamide), hydrazine derivatives or
semicarbazides. Monosodium citrate D is specifically used in this application due to its approx. 10°C lower decomposition temperature compared to monosodium citrate F3500 and is also recommended for other applications for which a quicker dissociation is required.
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