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98% Purity SMBS Sodium Metabisulfite In Food Preservation CAS 7681 57 4

98% Purity SMBS Sodium Metabisulfite In Food Preservation CAS 7681 57 4

  • 98% Purity SMBS Sodium Metabisulfite In Food Preservation CAS 7681 57 4
  • 98% Purity SMBS Sodium Metabisulfite In Food Preservation CAS 7681 57 4
98% Purity SMBS Sodium Metabisulfite In Food Preservation CAS 7681 57 4
Product Details:
Place of Origin: Hunan
Brand Name: Kemsky
Certification: ISO 9001,sgs
Model Number: smbs -p4
Payment & Shipping Terms:
Minimum Order Quantity: 1 metric ton
Price: usd 300 per metric ton
Packaging Details: 25 kgs bag,1000 kgs big bag
Delivery Time: 5-8 days
Payment Terms: T/T , L/C
Supply Ability: 3000 tons per month
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Detailed Product Description
Name: Sodium Meta Bisulphite Preservative For Flour Other Name: Preservative For Flour Sodium Pyrosulfite
Capacity: 50000 Tons Per Year Application: Food Preservative,Antichlor ,Mordant ,Developer
Packing: 25 Kgs Plastic Woven/paper Bag Na2S2O5 Purity: Above 97%
High Light:

sodium metabisulfite industrial grade


sodium metabisulfite reducing agent

sodium metabisulfite preservative food grade  for flour




Certificate of Analysis


Tests Specification
Appearance White free-flowing Crystal Powder
Purity (Na2S2O5) 97% min
Iron (Fe) 0.003% min
Heavy Metal (Pb) 5 ppm max
Arsenic (As) 1 ppm max
Water Insoluble 0.05% max
PH Value 4.0-4.6

Dechlorination Sodium Metabisulfite 7681-57-4


Property: Dechlorination Sodium Metabisulfite is:

white or light yellow crystal powder, a strong smell of sulfur dioxide,relative density is 1.4, easy to dissolve in water

and glycerin, water solution.

It has acidity,and its solubility will become large while raising the temperature and is less to dissolve in ethanol.
Appearance: Pure White Crystalline Powder .

(1) Food Grade: Bleach agent (e.g. candies, cake, bamboo shoots, etc); Loose agent (e.g. bread, cracker etc);

Antiseptic and germicide (e.g. fruit juice, tinned food, brews, the cereals food is defended storage etc);

Inhibitor and freshen agent (e.g. day lily, seafood, fruit and vegetable etc).

Store the product in a cool and dry place, prevent from direct sunlight ,water and moisture, avoid contact with strong acid,oxidants or poisonous substances. Exposure to moisture will make it oxidze easily to sodium sulphate.Do not store it for long time.



Sodium Metabisulfite Food Grade Specifications

Item Specification Testing Result
Purity (AS Na2S2O5 ) 97.0% Min 97.6%
Sulfur Dioxide (SO2) 65.0% Min 65.8%
Arsenic (As) 0.0002% Max 0.00005%
Heavy Metals (As Pb) 0.0005% Max 0.0003%
Selenium (Se) 0.0005% Max 0.00006%
Iron (Fe) 0.002% Max 0.001%
Water Insoluble 0.02% Max 0.014%
Ph Value 4.0~4.8 4.5



Sodium Metabisulfite Food Grade

Application of sodium metabisulfite in food industry
Sodium Metabisulfite is widely used in food industry. Besides bleaching effect, Sodium Metabisulfite also owns the following functions:

1) Sodium Metabisulfite in food has anti-browning effects. Enzymatic browning often occurs in fruit, potato food. Sodium Metabisulfite is a kind of reducing agent, has a strong inhibitory effect on the polyphenol oxidase activity.

2) Sodium Metabisulfite in food has antiseptic effect. Sodium Metabisulfite can play the role of acidic preservative, the undissociated sulfurous acid is considered it can inhibit yeasts, moulds and bacteria. The inhibition of undissociated sulfurous acid for colon bacillus is 1000 times stronger than Hydrogen sulfite, 100 to 500 times stronger than beer yeast, 100 times stronger than leaf mold. Sulfur dioxide in the acid has the most powerful anti microorganism effects.

3) Sodium Metabisulfite in food has loosen machine effect, Sodium Metabisulfite can be used as the constituent of loosen machine.

4) Sodium Metabisulfite in food has oxidation resistance effect. Sodium Metabisulfite has distinctive resistance effect. Sulfurous acid is strong reducing agent, it can consume the oxygen in organization of fruits and vegetables, inhibit the activity of inhibit the activity of oxidizing enzyme, it is effective to prevent oxidation and breaking of vitamin C in fruits and vegetables.


The mechanism Sodium Metabisulfite effects: Decolorizers can be divided into two types by its function: oxidation type bleaching agent & reducing type bleaching agent. Sodium Metabisulfite belongs to reducing type bleaching agent.

Sodium Metabisulfite effects decoloring function by pigment reducing action, so as to achieve the purpose of bleaching. The colors of most organics are produced by chromophore its molecules contains. All of chromophore contains unsaturated bood, reduction bleaching agents release hydrogen atoms, it can make unsaturated bood in chromophore become single bond, so organics loses color. The browning of some foods is caused by existing of ferric ion, to add reduction bleaching agents can make ferric ion become two valence iron ion, prevent browning of food.


Sodium Metabisulfite effects fading function by addition reaction of sulfite. So as to achieve the purpose of bleaching. Sodium Metabisulfite can contact glycosides and carbohydrates to make addition reaction to bleach and fade. This action is reversible, sulphurous acid can be removed by heating or acid treatment, to make anthocyanin regenerate and resume the original red.








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