CAS: 7681-57-4
Sodium Metabisulfite is a widely used inorganic compound known for its strong preservative and antioxidant properties. It differs from other sulfite salts due to its higher reactivity, making it especially effective in applications that require quick and efficient chemical interactions. Historically, sodium metabisulfite has been used across various industries, from pharmaceuticals to food processing, due to its ability to inhibit oxidation and microbial growth. It belongs to the sulfite family and plays an important role in maintaining the stability and shelf life of products.
Sodium Metabisulfite is also used in the wine industry, where it plays a crucial role in maintaining the quality of wine by preventing oxidation and preserving its flavor. It is typically added during the winemaking process to protect the wine from spoilage and ensure its freshness during aging.
Key Properties of Sodium Metabisulfite
CAS: 7681-57-4
Molecular Formula: Na2S2O5
Melting Point150 °C (decomp)
Solubility: Soluble in glycerol, insoluble in water
pH (1% solution): 3.5-5.0 (20 °C, 5%)
Physical Properties of Sodium Metabisulfite
White crystalline powder appearance
Distinct sulfurous odor
High water solubility
Acidic in nature, contributing to its role as a preservative
Stability under various thermal conditions, making it suitable for processes involving heat
Applications in Pharma
In the pharmaceutical industry, sodium metabisulfite is frequently used as an antioxidant in injectable medications, preventing the oxidation of active ingredients. It is also employed in the purification of certain compounds and in the production of antibiotics. Its solubility and stability are crucial in maintaining the efficacy of medications over time.
Applications in Other Industries
Agriculture: Sodium metabisulfite is used as a disinfectant and fungicide, especially in the fruit industry, to prevent fungal growth during storage and transportation.
Food and Nutrition: Used as a preservative to prevent spoilage and maintain freshness in food products.
Personal Care: Commonly found in cosmetics and hair care products to preserve formulations.
HI&I (Household, Industry, and Institutions): Used in industrial cleaning products for its preservative and stabilizing properties.
Oil and Gas: Used in water treatment and drilling fluids to reduce oxidative reactions.