Sodium Tartrate

Sodium tartrate (CAS Number 868-18-8) is the sodium salt of tartaric acid, a naturally occurring organic acid found primarily in grapes and tamarinds. The compound exists in several forms, with disodium tartrate being the most common in food applications. It appears as a white to off-white crystalline powder that is highly soluble in water. Chemically, sodium tartrate contains no synthetic components—it is derived from natural fruit acids, making it acceptable in both conventional and organic food systems in many jurisdictions.

Sodium tartrate serves multiple functional roles in food manufacturing. As an emulsifier or emulsifier salt, it helps stabilize mixtures of oil and water that would normally separate, making it valuable in processed cheese, margarine, and other emulsified products. Its pH control properties allow it to maintain or adjust acidity levels in foods, which is important for both flavor and preservation. As a sequestrant, sodium tartrate binds metal ions like iron and copper, preventing them from catalyzing oxidation reactions that degrade food quality, color, and nutritional value. This function is particularly important in beverages, oils, and products prone to discoloration. The additive is used at relatively low levels, typically ranging from 0.1% to 0.5% depending on the application and desired effect.

Sodium tartrate has an extensive history of safe use in food. The FDA has designated it as Generally Recognized As Safe (GRAS), a status reflecting both its natural origin and the absence of adverse health effects at levels used in food. The FDA's adverse event database contains zero reported incidents specifically linked to sodium tartrate, and no recalls involving this additive have been issued. This safety profile reflects decades of global food industry use without documented health concerns.

Toxicological data on sodium tartrate shows low acute toxicity. Animal studies have demonstrated that the compound is minimally absorbed in the gastrointestinal tract and is largely excreted unchanged. The European Food Safety Authority (EFSA) has similarly evaluated sodium tartrate and recognized its safety in food applications. Dietary exposure to sodium tartrate from food is typically minimal compared to tartaric acid consumption from natural food sources like wine and fruit.

Sodium tartrate is approved for use as a food additive in multiple regulatory jurisdictions. In the United States, it is GRAS and may be used in foods in accordance with FDA regulations. The European Union lists sodium tartrate (E335 for disodium salt, E336 for dipotassium salt) as an approved food additive with specified maximum levels depending on the food category. In many countries, including Australia, Canada, and Japan, sodium tartrate is permitted for food use with appropriate restrictions based on food type. Its approval in organic food standards in various regions reflects its natural origin and safety profile.

Scientific literature on sodium tartrate is limited, consistent with its long-established safety history and lack of known health concerns. Available research has focused on its functional properties rather than safety investigations. Studies confirm its effectiveness as an emulsifier and sequestrant in various food systems. The minimal absorption and rapid excretion of sodium tartrate observed in animal models supports its safety profile. No significant adverse findings have emerged from the regulatory bodies that have evaluated this compound, and it remains included in food safety databases as an approved additive with no special restrictions or warnings for normal food use.