Calcium oxide powder for food processing is a white, alkaline substance (food-grade lime, E529) used as a firming agent, acidity regulator, and peeling aid in foods such as pickles, canned vegetables, and tortillas. It must meet strict purity standards for human consumption.
What does calcium oxide powder do in food processing?
In food processing, calcium oxide raises pH and firms texture. It is used in traditional nixtamalization of corn, in some fruit and vegetable peeling, and to adjust acidity in certain canned goods. Because it reacts with water to form calcium hydroxide, it is often added as a slurry or in controlled amounts.
How is food-grade calcium oxide powder made and regulated?
Food-grade calcium oxide is produced by heating high-purity limestone to drive off carbon dioxide, then milling to a fine powder. Manufacturers must control heavy metals and ensure the product meets food additive specifications such as FCC or E529. Buyers should request a certificate of analysis and a food safety statement from their calcium manufacturer.
What should you look for in a calcium supplier?
Choose a calcium supplier that provides consistent particle size, low impurities, and documented compliance with food regulations. Reliable suppliers also offer technical support for dosage and handling. If you source from regions like China, verify that the supplier exports food-grade material and can provide full traceability.
China calcium salts producers are a major source of food-grade calcium oxide, but quality varies, so audit your supply chain carefully.
How should calcium oxide powder be stored and handled?
Store calcium oxide powder in sealed, moisture-proof containers away from acids and organic materials. It is a strong irritant, so use dust masks, gloves, and eye protection during handling. Keep it dry to prevent caking and loss of reactivity.
常见问题
Is calcium oxide powder safe to eat directly?
No, calcium oxide powder is highly alkaline and can cause severe burns if eaten directly. In food processing, it is used in small, controlled amounts and is usually converted to calcium hydroxide or neutralized before consumption. Always follow food-grade specifications and local regulations.
What is the difference between food-grade and industrial calcium oxide?
Food-grade calcium oxide is manufactured and tested to meet strict purity limits for heavy metals and other contaminants, while industrial grades may contain higher impurity levels. Only food-grade material should be used in products intended for human consumption. Certificates of analysis help confirm compliance.
How do I choose a reliable calcium oxide supplier for food use?
Look for a supplier that consistently provides food-grade certificates, clear specifications, and traceability. It also helps to work with a calcium manufacturer experienced in food applications and to request samples before committing to bulk orders. Verify compliance with your target market's regulations.
