Application Note of Food Grade Sodium Metabisulfite

Sodium metabisulfite is a white or light yellow crystalline powder with a strong smell of sulfur dioxide. Sodium metabisulfite has better reducibility, and its reduction effect is similar to sodium sulfite.

　　When using food grade sodium metabisulfite, the following points should be noted:

　　 1) When metal ions are present in the food, the residual sulfite can be oxidized, and the reduced pigment can be oxidized and discolored, thereby reducing the effectiveness of the bleach. Therefore, metal chelating agents are used simultaneously in production.

　　 2) Sodium metabisulfite solid reducing bleach, the solution is unstable and volatile, so it should be prepared for use to prevent the sulfite from unstable and volatile.

　　 3) Sulfurous acid can not inhibit the activity of pectinase, which will damage the cohesion of pectin. In addition, after sulfurous acid penetrates into the fruit tissue, the sulfur dioxide can only be removed when the fruit breaks during processing. Therefore, fruits preserved with sulfurous acid are only suitable for making jams, dried fruits, fruit wine, preserves, etc., and cannot be used as raw materials for canning.　　 5) Sulfite can destroy thiamine, so it is not easy to use in fish food.

　　 4) Due to the disappearance of sulfur dioxide, sulfite bleaching materials are easy to recolor, so usually excess sulfur dioxide remains in food, but the residual amount should not exceed the standard.

　　 5) Sulfite reacts easily with aldehydes, ketones, proteins, etc.

　　 Food grade sodium metabisulfite storage precautions:

　　Store in a cool, dry, well-ventilated warehouse. Keep away from fire and heat. Keep container tightly closed. It should be stored separately from oxidants, acids and edible chemicals, and avoid mixed storage. It should not be stored for a long time to avoid deterioration. The storage area should be equipped with suitable materials to contain the leakage. Storage and shelf life of food grade sodium metabisulfite: shading, sealed and stored.

Brief introduction of food grade sodium metabisulfite

　　 1. Chinese alias: sodium metabisulfite; sodium disulfite; heavy sulfoxide; sodium metabisulfite; sodium metabisulfite; sodium metabisulfite; edible sodium metabisulfite.

　　 2. Appearance: white

　　 3. Product specifications: sulfur dioxide ≥ 65%, iron ≤ 0.005%, water insoluble matter ≤ 0.05%, PH value: 4.0-4.6

　　 4. The Chinese name of the chemical: sodium metabisulfite; category: antioxidant.

　　 5, molecular weight 190.10

　　 6. Appearance and properties: It is colorless prismatic crystal or white powder; it has sulfur dioxide smell, acidity and saltiness; the color changes gradually after storage.

　　 7. Melting point (℃): >300 (decomposition)

　　 8, relative density (water = 1): 1.48

　　 9. Solubility: soluble in water, the aqueous solution is acidic (54g/100ml water at 20℃; 81.7g/100ml water at 100℃). Soluble in glycerin, slightly soluble in ethanol. The relative density is 1.4. It is soluble in water, soluble in glycerin, and slightly soluble in ethanol. It is easily decomposed by moisture and easily oxidized to sodium sulfate in exposed air. Contact with strong acids releases sulfur dioxide and generates corresponding salts. Heated to 150 ℃ decomposition.

　　 10. Conditions for reducing contact: humid air.

　　11. Packing: polypropylene woven bag for external use, paper-plastic composite bag, kraft paper bag, lined with polyethylene plastic bag.

　　 12, Net weight: 25, 50, 1000 kg/bag or customized according to customer requirements.