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Potassium sodium tartrate (CAS 304‑59‑6), also known as Rochelle salt, is a double salt of tartaric acid, appearing as colourless crystalline granules soluble in water. It is permitted as food additive (E337). In food systems, it acts as sequestrant, stabiliser and buffering agent. It is widely used in baking powders to regulate leavening reaction, and applied in confectionery and processed foods to control metal‑ion‑catalysed oxidation. It also finds usage in analytical chemistry and electro‑optical material research.
Potassium sodium tartrate (E337, Rochelle salt, CAS 304‑59‑6) is a permitted food additive evaluated by JECFA and EFSA. It functions as a buffering agent, sequestrant and stabiliser in food production. This double salt of tartaric acid is highly soluble in water, with weak alkaline properties, and is widely adopted across bakery, confectionery and processed‑food categories.
Its most typical application is within baking powder formulations. It works as an acid‑reacting component to moderate the rate of carbon dioxide generation when mixed with sodium bicarbonate. It helps achieve steady leavening during dough mixing and oven baking, avoiding overly rapid or delayed gas release. This delivers uniform volume and fine crumb texture for cakes, biscuits and quick‑bread products. Compared with other leavening acids, it offers mild flavour and does not leave sharp sour aftertastes in baked goods.
As an effective sequestrant, potassium sodium tartrate binds metal ions such as iron and copper in food matrices. It suppresses metal‑catalysed oxidation and discolouration, protecting flavour and colour quality. It is added to margarine, processed fats, fruit‑based fillings and syrup products to slow rancidity and browning during shelf storage. It also serves as a pH buffer to stabilise acidity in confectionery, jellies and sugar‑boiled goods, maintaining consistent texture and preventing unwanted sugar crystallisation.
In confectionery production, especially hard candy and cream‑based sweets, it adjusts syrup viscosity and controls crystal growth. It improves chew texture and surface smoothness. It is also used in some beverage systems to stabilise pH and mitigate adverse effects brought by trace metal impurities. In processed meat products, it occasionally assists texture stabilisation within authorised dosage limits.
This ingredient has clear usage constraints. It is not a preservative and cannot inhibit microbial spoilage. Formulators must follow regional food‑additive standards. Excessive addition may bring subtle salty‑metallic off‑notes. It is not suitable for formulas requiring strong acidic conditions, where other tartrate or citrate salts perform better.
In conclusion, potassium sodium tartrate (E337) is a multi‑purpose food additive. Its primary food uses include leavening agent component in bakery powders, metal‑ion sequestrant against oxidation, pH buffer and crystal‑controlling agent in confectionery. It improves product texture, colour stability and sensory performance. Manufacturers should keep dosages within regulatory limits and match its properties to suitable neutral‑to‑mild‑alkaline food systems for optimal results.
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