Calcium sorbate

Calcium sorbate (CAS 7492-55-9), also designated E203, is the calcium salt form of sorbic acid used as a broad-spectrum preservative across food, cosmetic, and pharmaceutical applications. It inhibits the growth of mold, yeast, and bacteria, extending shelf life in moisture-sensitive and pH-neutral formulations where potassium sorbate may be less suitable for the specific application.

In food manufacturing, E203 is used to preserve baked goods, dairy products, and processed foods where a lower-sodium or lower-potassium preservative profile is required for the final product. Cosmetic formulators incorporate it into creams, lotions, and personal care products as a mild antimicrobial agent compatible with a range of pH levels and various chemical ingredients.

Pharmaceutical manufacturers use it to protect topical preparations, oral suspensions, and semi-solid dosage forms against microbial contamination during storage and distribution cycles. Its reduced hygroscopicity compared to potassium sorbate also makes it a practical choice for dry-blend and powder-based formulations, ensuring stability and ease of handling during production.

Calcium sorbate is supplied as a white to off-white crystalline powder. Food-grade material conforming to FCC and E203 specifications is the most commonly traded form for industrial use. Pharmaceutical-grade material is also available to BP and Ph. Eur. standards for regulated applications, ensuring high purity and compliance with international safety requirements.