Calcium Bisulfite (E227)

Purpose and Function

Calcium Bisulfite (E227) is used as a preservative and antioxidant in the food industry. It helps to prevent spoilage, oxidation, and browning in various food products, thus extending their shelf life. Its use is more common in acidic environments where its effectiveness is enhanced. Common applications include:

• Beverages: Occasionally used in wines, fruit juices, and ciders to prevent spoilage and oxidation, maintaining flavor and freshness.
• Dried fruits and vegetables: Helps maintain color and prevent browning in products such as dried apricots and other dried fruits.
• Seafood: Sometimes used to preserve the appearance and color of fresh or frozen seafood, such as shrimp.
• Baking and processed foods: Can be used in certain processed foods to extend shelf life and inhibit microbial growth.

Although effective, Calcium Bisulfite (E227) is less commonly used compared to other sulfite-based preservatives, such as sodium metabisulfite (E223) or potassium metabisulfite (E224).

Potential Risks and Side Effects

Calcium Bisulfite (E227) is generally recognized as safe when used within regulatory limits, but it does present some potential risks and adverse effects:

• Allergic reactions: E227 can cause allergic reactions, especially in individuals with asthma or sulfite sensitivity. Symptoms may include difficulty breathing, wheezing, hives, or skin irritation.
• Sulfite sensitivity: Some people may experience symptoms like headaches, nausea, or digestive discomfort after consuming foods containing calcium hydrogen sulfite.
• Regulatory restrictions: There are strict regulations in many countries, including the European Union and the United States, regarding the allowable levels of E227 in food products. Labeling requirements are often in place to inform consumers about its presence.
• Nutrient degradation: Sulfites can degrade certain vitamins, such as vitamin B1 (thiamine), potentially reducing the nutritional value of foods treated with E227.

Despite these concerns, Calcium Hydrogen Sulfite (E227) remains a useful preservative when used in accordance with regulatory guidelines.