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Food Chemistry
Sodium Metabisulfite
Formula:
Na2S2O5
GOST/CAS:
CAS 7681-21-4
Sodium metabisulfite (sodium pyrosulfite, food additive E223) is a highly effective complex chemical agent that functions as a powerful preservative, antioxidant, disinfectant, and bleaching agent. The product is a white or slightly yellowish crystalline powder with a characteristic pungent odor of sulfur dioxide, which is highly soluble in water. Thanks to its ability to inhibit the growth of bacteria, molds, and yeasts, as well as to slow down oxidation processes (enzymatic browning), sodium metabisulfite is indispensable in the food industry, winemaking, and a variety of technical and pharmaceutical applications.
Applications
Fruit, Vegetable, and Mushroom Processing: Applied in the processing of fresh, frozen, dried, or canned fruits and vegetables. It prevents enzymatic browning and maintains the natural, appealing appearance of potatoes, apples, raisins, mushrooms, and seafood.
Confectionery and Bakery Industry: Acts as a reducing agent to relax the gluten structure in dough. It helps in the production of hard biscuits, crackers, and galettes by making the dough more plastic, facilitating molding, and reducing product shrinkage.
Juice, Syrup, and Canning Production: Added as a reliable preservative to berry and fruit purees, juices, jams, and marinades to suppress microbial activity and significantly extend the shelf life of finished products.
Key Advantages
Powerful Antimicrobial Action: Effectively suppresses the vital activity of bacteria, fungi, and yeasts even at low concentrations, ensuring microbiological purity.
Antioxidant Protection: Reliably blocks oxidative processes, prevents rancidity, and preserves vitamins (especially Vitamin C) along with the original color of food products.
High Purity Level: The food-grade qualification guarantees the absence of toxic impurities and heavy metals, strictly complying with international safety standards for food additives.
Technological Versatility: Dissolves easily, reacts quickly, and distributes evenly throughout the product mass, ensuring a consistent result throughout the entire storage period.
Storage & Transportation
- Store in dry, cool, and well-ventilated warehouses in tightly closed original packaging, away from heat sources, moisture, and direct sunlight.
- Do not store together with acids and oxidizing agents, as contact with acids releases a toxic gas — sulfur dioxide.
- Avoid damaging the packaging because the product is hygroscopic and gradually oxidizes to sodium sulfate when exposed to air.
- Transportation is possible by all types of covered transport in compliance with the regulations for shipping chemical goods. The material belongs to low-hazard substances when precautionary measures are followed. The guaranteed shelf life is 1 year from the date of manufacture.
Technical Specifications
Appearance
White or cream crystalline powder
Molecular Weight
190.11 g/mol
Assay (Main Substance)
≥ 97.0%
Sulfur Dioxide Content
≥ 65.0%
Density (at 20°C)
1.48 g/cm³
pH (10% Aqueous Solution)
4.0 – 4.5 (weakly acidic environment)
Water Solubility (at 20°C)
~ 650 g/l
Supply info
- Multi-layer paper or polypropylene bags with a hermetic polyethylene liner of 25 kg (standard packaging for powder form).
- Big Bags (FIBC) of 1000–1200 kg for large-scale industrial enterprises.
- Delivery available via consolidated shipments and palletized batches.