Trisodium Citrate: Effects, Uses & Safety
Trisodium citrate is the sodium salt of citric acid, widely used as a food additive, buffering agent, and in medical applications.
Things worth knowing about "Trisodium citrate"
Trisodium citrate is the sodium salt of citric acid, widely used as a food additive, buffering agent, and in medical applications.
What is Trisodium Citrate?
Trisodium citrate (also known as tribasic sodium citrate or tri-sodium citrate) is the trisodium salt of citric acid. It carries the E-number E331(iii) and belongs to the group of citrates that are widely used in the food industry, pharmacy, and medicine. Its chemical formula is Na₃C₆H₅O₇ · 2H₂O. The compound dissolves readily in water and has an alkaline reaction, making it valuable for numerous technical and medical applications.
Areas of Application
Food Industry
In the food industry, trisodium citrate is used as an acidity regulator, stabilizer, and emulsifying salt. It adjusts the pH of food products, improves texture, and extends shelf life. Typical applications include:
- Processed cheese and cheese products (prevents fat separation)
- Beverages and soft drinks (as a buffering substance)
- Jellies and desserts
- Dairy products and ice cream
Pharmaceutical Applications
In pharmacy, trisodium citrate serves as a buffering agent in medications to stabilize pH. It is also used as an anticoagulant (blood-thinning agent) in blood collection and blood banking: by binding calcium ions, it inhibits blood clotting in blood samples and stored blood products.
Medical Applications
Medically, trisodium citrate is used for the treatment of urinary tract conditions, particularly for:
- Metabolic acidosis: It acts as an alkalizing agent, helping to normalize the acid-base balance of the blood.
- Prevention of kidney stones: It raises urinary pH and can reduce the formation of certain kidney stones (e.g., uric acid stones).
- Symptomatic treatment of cystitis: By alkalizing the urine, it can relieve burning discomfort during urination.
Mechanism of Action
Trisodium citrate is broken down in the body into citrate and sodium ions. The citrate is metabolized in the liver and converted to bicarbonate, which raises the pH of the blood and urine. As a chelating agent, it also binds calcium ions, which explains its anticoagulant effect.
Dosage and Administration
The dosage of trisodium citrate as a medicinal product depends on the specific indication and should always be taken according to medical advice. As a food additive, it is subject to legally regulated maximum levels in accordance with EU food additive regulations. In beverages and processed foods, it is generally recognized as safe (GRAS).
Side Effects and Safety
At the amounts typically used in food, trisodium citrate is considered well-tolerated and safe. When used medically at higher doses, the following side effects may occur:
- Gastrointestinal complaints (e.g., nausea, diarrhea)
- Increased sodium intake (relevant for people with high blood pressure or heart failure)
- In case of overdose: alkalosis (excessively alkaline blood pH)
People with impaired kidney function or heart conditions should only take trisodium citrate under medical supervision.
References
- European Food Safety Authority (EFSA): Re-evaluation of citric acid (E 330) and sodium, potassium and calcium salts of citric acid (E 331, E 332, E 333) as food additives. EFSA Journal 2020;18(3):6033.
- World Health Organization (WHO): International Programme on Chemical Safety – Sodium Citrate. Geneva, 2019.
- Lacy CF et al.: Drug Information Handbook. 30th edition. Lexicomp, 2023. (Entry: Sodium Citrate)
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