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Sodium metabisulfite is a white or light yellow crystalline powder with a strong odor of sulfur dioxide. Sodium metabisulfite has better reducibility than sulfite, and its reduction effect is similar to that of sodium sulfite. Sodium metabisulfite is divided into many categories according to its use, such as food grade sodium metabisulfite and industrial grade sodium metabisulfite. Today, let's introduce the useFood grade sodium metabisulfiteShould pay attention to the matters? 对照阅读

1) When there are metal ions in food, the residual sulfite will be oxidized, and the reduced pigment will be oxidized and changed color, thereby reducing the effect of bleaching agent. Therefore, a metal chelating agent is used simultaneously in the production. 同题参见

2) Sodium metabisulfite is a reducing bleaching agent. Its solution is unstable and volatile, so it should be prepared and used immediately. Sulfite cannot be volatilized due to instability. 更多阅读

3) Sulfurous acid cannot inhibit the activity of pectinase, which will destroy the cohesion of pectin. In addition, sulfur dioxide can only be removed when the fruit is broken during reprocessing after the sulfite has penetrated into the fruit tissue. Therefore, the sulfite preserved fruit is only suitable for the production of jam, dried fruit, fruit wine, candied fruit, etc., can not be used as raw materials for canned food.

4) Due to the disappearance of sulfur dioxide, sulfite bleaching materials are easy to recolor, so excessive sulfur dioxide is usually left in the food, but the residue should not exceed the standard.

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

6) Sulfites can destroy thiamine, so it is not easy to use in fish food.

Precautions for storage of food grade sodium metabisulfite:

Store in a cool, dry, well-ventilated warehouse. Keep away from fire and heat sources. Keep container sealed. It should be stored separately from oxidants, acids and food chemicals, and mixed storage is prohibited. It should not be stored for a long time to avoid deterioration. Storage areas shall be provided with suitable materials to prevent leakage. Storage and expiration date of the product: shading and sealed storage.

In our life, sodium metabisulfite is closely related to the life around us,Food grade sodium metabisulfiteThe uses are as follows:

1. It can be used as bleaching agent, mordant, reducing agent, rubber coagulant, organic synthesis, pharmacy and fragrance.

2. In the dye and pharmaceutical industries, it can also be used as a chromatographic reagent, preservative and reducing agent.

3. Food grade sodium metabisulfite is more reductive than sulfate, and its effect is similar to sodium sulfite.

According to Chinese regulations, it can be used for preserves, biscuits, sugar, rock sugar, bud sugar, candy, glucose, liquid glucose, bamboo shoots, mushrooms and canned mushrooms. Containing 0.45 g/kg. The residue of preserved fruit, bamboo shoots, mushrooms, canned mushrooms, grapes and blackcurrant juice concentrate (calculated as SO2) is less than 0.05 g/kg; The residue of biscuits, sugar, vermicelli and other varieties is less than 0.1 g/kg; The residue of liquid glucose shall not exceed 0.2 g/kg.,

4. Food grade sodium metabisulfite is used in the food industry as a bleaching agent, preservative, filler, antioxidant, color stabilizer and preservative.

5. Used in the pharmaceutical industry for the production of phenylsulfone and benzaldehyde. Used as a coagulant in the rubber industry. In the printing and dyeing industry, it is a dechlorination agent and a cooking aid for cotton after bleaching. The leather industry is used for leather processing to make leather soft, plump, tough, waterproof, flexible and wear-resistant. Chemical industry I for the production of hydroxyvanillin and hydroxylamine hydrochloride. The photosensitive industry acts as a developer.

6. Food grade sodium metabisulfite can be used as a preservative, reducing agent and antioxidant.