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Food-grade sodium metabisulfite (, E223) is a white, crystalline, water-soluble powder used as a preservative, antioxidant, and antimicrobial agent in the food industry. It preserves color and freshness in wines, dried fruits, fruit juices, and processed foods. It is commonly used in shrimp processing to prevent black spots (melanosis) and in winemaking to control fermentation.      Key Aspects of Food Grade Sodium Metabisulfite:

• Purity & Safety: Food-grade, such as 98-99% purity, ensures compliance with safety standards for human consumption.
• Key Functions: Acts as an anti-melanosis agent, antimicrobial, and antioxidant to extend shelf life.
• Common Applications:
  • Wine & Beer Making: Used as a sanitizing agent and to prevent oxidation.
  • Food Processing: Used in dried fruits, fruit juices, coconut cream, and processed vegetables.
  • Seafood: Prevents black spot (melanosis) in shrimp.
• Safety Warning: It is a sulfite, which can cause allergic reactions in sensitive individuals, including asthmatics.
• Dosage: The acceptable daily intake is up to  per kg of body weight. 

It is frequently found as a white powder with a distinct sulfur odor.