E NO: E331iii
It is in the form of a white crystalline powder that has a salty and sour taste. It is a weak base and is used in combination with citric acid to produce biological buffers.Trisodium citrate that some times simply known as sodium citrate is a three sodium salts of citric acid.
This product occurs as white, granular crystals or as white, crystalline powder. It is freely soluble in water and practically insoluble in ethanol (96 %).
|Molar mass||258.06 g/mol (anhydrous), 294.10 g/mol (dihydrate)|
|appearance||White crystalline powder|
|Melting point||> 300 °C (572 °F; 573 K) (hydrates lose water ca. 150 °C)|
|Solubility in water||Pentahydrate form: 92 g/100 g H2O (25 °C)|
Sodium citrate can be simply prepared by the acid-base reaction of sodium hydrogencarbonate (NaHCO3) and citric acid (C6H8O7) according to the below reaction:
3NaHCO3 (aq) + C6H8O7 (aq) → Na3C6H5O7 (aq) + 3H2O (l) + 3CO2 (g)
Heat the solution until it reaches boiling point and until the excess water evaporates to form a precipitate and the sodium citrate product crystallizes. The filter product is then washed and dried.
|Sodium hydrogencarbonate||Releases carbon dioxide by gentle heating (or by acids). Sodium hydrogen carbonate is an approved food additive, E500, and is used as a baking soda.|
|Citric acid||It can cause severe eye and skin irritation and may cause respiratory irritation.|
This is a valid food additive, E330.
|Sodium citrate||Low Hazard|
Sodium citrate is an approved food additive, E331.
Trisodium citrate uses as acidity regulator, emulsifier, stabilizer. in food industry it used as a food additive that uses in heat treated butter milk and many other food products.
It is used as a weak acid conjugate base as a buffer or acidity regulator and can withstand pH changes. This property is used to control the acidity of some ingredients such as gelatinous desserts. It is also used in many dairy products to control acidity.
Several applications of sodium citrate as mention as below:
Baby Food, Infant Formula
Ready Meals, Instant Food
Sauces, Dressings, Seasonings
OTC, Food Supplements
Cleaners & Detergents
Instant Drinks, Syrups
RTD Tea and Coffee
Side effects of overdose include muscle cramps, swelling, weakness, mood swings, rapid and shallow breathing, rapid heartbeat, black or bloody stools, severe diarrhea with seizures.