Sodium Citrate in Food: Uses, Safety & Buying Guide

Sodium Citrate (Na₃C₆H₅O₇)

Abstract

Sodium citrate, particularly trisodium citrate (INS 331(iii)), is an important food additive used as an acidity regulator, buffering agent, stabilizer, emulsifier, and sequestrant. It is widely used in processed cheese, dairy products, beverages, and various processed foods. According to international standards such as Codex, the permitted level depends on the specific food category and applicable regulatory requirements.[1]

Introduction

Sodium citrate is one of the most widely used food additives in the food industry. The term “sodium citrate” may refer to different sodium salts of citric acid; however, the most commonly used form in food applications is trisodium citrate. trisodium citrate is the sodium salt of citric acid and is widely used as:

• Acidity regulator
• Buffering agent
• Stabilizer
• Emulsifier / emulsifying salt
• Sequestrant

According to the Codex General Standard for Food Additives (GSFA), trisodium citrate is listed under INS 331(iii) and has several technological functions, including acidity regulation, stabilization, sequestration, and emulsification.[2]

Chemical and Technical Characteristics [2]

Why is Sodium Citrate Used in the Food Industry? [3-4]

One of the major advantages of sodium citrate is that it is not simply an acidulant. It can simultaneously affect pH, buffering capacity, product stability, emulsification, and interactions with metal ions.

Its main technological functions include:

• Controlling and stabilizing pH
• Providing buffering capacity
• Improving product stability
• Supporting emulsion stability
• Acting as a sequestrant
• Improving the texture and functionality of certain processed food

Main Food Applications [5]

Sodium citrate, particularly trisodium citrate (INS 331(iii)), is used in a wide range of food products, including:

• Processed cheese and cheese sauces – emulsification, pH control, texture and emulsion stability
• Dairy products – acidity regulation and stabilization
• Milk and flavored milk – buffering and stabilization
• Yogurt and fermented dairy products – acidity and pH control
• Beverages and soft drinks – acidity regulation, buffering and flavor balance
• Sports and electrolyte drinks – acidity control and sodium/citrate contribution
• Fruit drinks and juices – pH adjustment and acidity balance
• Jams and jellies – acidity and pH control
• Ice cream and frozen desserts – stabilization and formulation control
• Processed meat products – pH control, stabilization and sequestration
• Sauces and dressings – pH control and emulsion stability
• Instant and processed foods – stabilization and formulation functionality
• Bakery products – pH adjustment and formulation support
• Confectionery products – acidity and pH control

International Food Additive Standards [5]

An important regulatory point is that there is not one universal maximum permitted level for sodium citrate in all foods.

The permitted level depends on the:

• Specific food category
• Intended technological function
• Applicable conditions of use
• National or regional legislation

Acceptable Daily Intake (ADI) [1]

One important point regarding trisodium citrate is that JECFA has not established a numerical ADI for it and lists the ADI as “Not Limited.”

JECFA’s evaluation considered citric acid and its calcium, potassium, and sodium salts and concluded that, based on their known metabolic pathways and available toxicological data, they do not represent a significant toxicological hazard at the levels normally used in food.

However, “Not Limited” does not mean that the substance can be used without regard to formulation or regulations.

The amount used in food production must still comply with:

• GMP requirements
• Specific food-category requirements
• Product standards
• National regulations
• Labelling requirements

Why is Food-Grade Quality Important?

For customers purchasing sodium citrate for food production, the chemical name alone is not sufficient.

Important purchasing and quality parameters include:

• Chemical Purity

The purity of sodium citrate should comply with the agreed product specification.

• Heavy Metals

Levels of heavy metals and other relevant contaminants should comply with the applicable food-grade specification.

• Moisture / Water Content

This is particularly important for hydrated forms because the product may contain water of crystallization.

• pH

The pH of a standardized aqueous solution is an important quality-control parameter.

• Assay

The active sodium citrate content should meet the agreed specification.

• Microbiological Quality

For food-grade products, appropriate microbiological specifications and manufacturing controls are important.

• Certificate of Analysis (CoA)

Each production batch should ideally be accompanied by a Certificate of Analysis containing the relevant quality-control parameters.

What should you consider when purchasing Sodium Citrate?

• Purity and chemical specification
• Correct grade and form (e.g., anhydrous or dihydrate)
• Moisture content and impurities
• Heavy metals and microbiological specifications
• Batch consistency
• CoA and technical documentation
• Compliance with applicable food regulations
• Packaging, storage conditions, and shelf life
• Supplier reliability and supply continuity

The right sodium citrate is not simply the lowest-priced product—it is a product that provides consistent quality, reliable performance, and the documentation needed for safe and compliant food production.

Why choose our product?

• High purity and consistent quality
• Reliable batch-to-batch performance
• Clear product specifications and Certificate of Analysis (CoA)
• Suitable for food-industry applications
• Reliable supply and professional technical support
• Traceability and appropriate packaging.

References

1. Joint FAO/WHO Expert Committee on Food Additives (JECFA). Trisodium Citrate. WHO/JECFA Food Additives Series.
2. FAO/WHO JECFA Joint FAO/WHO Expert Committee on Food Additives (JECFA)JECFA provides specifications and safety evaluations for sodium citrate and reports the ADI as “Not Limited.”
3. Codex Alimentarius Commission – GSFA Codex identifies trisodium citrate [INS 331(iii)] with the functional classes acidity regulator, emulsifier, emulsifying salt, sequestrant, and stabilizer
4. Mulsow et al. (2006) – Journal of Dairy ScienceThis study directly demonstrates that trisodium citrate affects calcium binding/chelation, casein dispersion, fat emulsification, texture, and physicochemical properties of processed cheese.
5. Codex Alimentarius – GSFA Codex Alimentarius Commission. General Standard for Food Additives (CXS 192-1995): Trisodium Citrate (INS 331(iii)).