What is Sodium Phosphate, Dibasic?
Sodium phosphate, dibasic is an inorganic salt compound composed of sodium and phosphate ions. It appears as a white crystalline powder and is highly soluble in water. The dibasic form (also called disodium phosphate) contains two sodium atoms per phosphate molecule. This additive is produced through chemical synthesis and has been used in food manufacturing for decades.
Common Uses
Sodium phosphate, dibasic serves multiple functions in food production. It is commonly used in processed meats, including ham, bacon, and sausages, where it acts as an emulsifier and antimicrobial agent to improve texture and extend shelf life. In baked goods, it functions as a leavening agent and anticaking agent in dry mixes. The additive appears in cheese products as an emulsifier salt, helping maintain texture and prevent separation. It is also used in instant puddings, dried soups, and various processed foods as a stabilizer and thickener. Additionally, it serves as a pH buffer in beverages and other products requiring pH adjustment.
Safety Assessment
Sodium phosphate, dibasic has been extensively reviewed for safety. The FDA has designated it as Generally Recognized As Safe (GRAS), indicating that qualified experts consider it safe for its intended uses at typical consumption levels. According to FDA records, there have been zero reported adverse events associated with this additive and zero recalls related to its presence in foods.
The European Food Safety Authority (EFSA) also permits sodium phosphate compounds as food additives (E339 for sodium phosphates) at specific usage levels depending on food category. The additive is used under defined conditions to ensure consumer safety.
Phosphate intake from food additives represents only a portion of total dietary phosphate exposure, as phosphates occur naturally in many foods and are part of normal metabolism. The primary concern with excessive phosphate intake relates to overall dietary patterns rather than individual additives at permitted levels. The kidneys regulate phosphate excretion in healthy individuals.
Regulatory Status
In the United States, sodium phosphate, dibasic is approved by the FDA as a direct food additive for use in various food categories. The Code of Federal Regulations (21 CFR 182.6376) specifies its approved uses and limitations. It must be manufactured and handled according to FDA requirements for food-grade quality.
The additive is accepted in many countries worldwide, including Canada, the European Union, Australia, and Japan. Specific usage levels and permitted food categories may vary by jurisdiction. In the EU, it is identified as E339(ii) and approved for use in numerous food categories with defined maximum levels.
Key Studies
Sodium phosphates have been subjects of numerous safety evaluations. The EFSA has reviewed sodium phosphate compounds multiple times, including in 2017, and confirmed their safety at permitted usage levels. These reviews evaluated absorption, metabolism, potential toxicity, and interactions with other dietary components.
Long-term animal studies have not identified concerns at levels relevant to food use. Human observational studies examining phosphate intake focus primarily on individuals with kidney disease or those consuming very high levels from multiple sources, which differs from normal food additive exposure.
The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has also evaluated sodium phosphates and established acceptable levels for their use in food.