Sodium metabisulfite is a white crystalline powder widely used in the food industry as an antioxidant, preservative, and reducing agent. Known by its E number E 223, it appears under several synonyms including disodium pyrosulfite, sodium disulfite, and sodium pyrosulfite. It serves as a reliable source of sulfur dioxide, which is the active component responsible for its preservative action.
For kosher food manufacturers, sodium metabisulfite is readily available with rabbinical certification from recognized authorities such as the KSA (Kosher Supervision of America) and other agencies. Its synthetic, mineral-based production process makes it inherently compatible with kosher requirements when manufactured on properly supervised equipment.
Why Sodium Metabisulfite Qualifies for Kosher Certification
Sodium metabisulfite is produced by reacting sodium hydroxide or sodium carbonate with sulfur dioxide gas. Because all raw materials are inorganic and mineral-derived, the product itself contains no animal, dairy, or plant-based components that would raise kashrut concerns.
The kosher certification process focuses on verifying that production equipment is not shared with non-kosher materials and that no prohibited processing aids are introduced during manufacturing.
Food Industry Applications
Sodium metabisulfite is used across a broad range of food categories. In winemaking, it prevents oxidation and inhibits wild yeast growth, helping preserve flavor and color stability. It is a standard additive in fruit juices, vegetable juices, and dried fruits, where it maintains freshness and prevents enzymatic browning.
The compound plays an important role in potato processing, where it stops the browning reaction in peeled or cut potatoes. It is also used in corn starch and corn syrup manufacturing as a processing aid. In the production of liquor and other beverages, sodium metabisulfite acts as both an antioxidant and a dechlorinating agent for process water.
Packaging and Available Grades
Food-grade sodium metabisulfite meeting FCC specifications is available in a range of package sizes suitable for both laboratory and industrial use. Common options include 1 lb. poly containers, 2.5 kg and 12.5 kg poly bags, 25 kg bags, and 50 lb. poly-lined bags. NSF certification is also available for products used in drinking water treatment applications.
Each batch typically comes with a certificate of analysis, a safety data sheet, and a specification sheet.
Kosher Sodium Metabisulfite Supplier
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