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E222 Sodium hydrogen sulphite is a chemical that is commonly used in the laboratory to inhibit the activity of DNA polymerases.
E222 Sodium hydrogen sulphite has been used in vitro to model infectious diseases, such as HIV, by simulating viral replication.
E222 Sodium hydrogen sulphite has also been shown to be effective in chemiluminescence methods for the detection of polysaccharides and proteins.
CAS: 7631-90-5
MF: HNaO3S
MW: 104.06
EINECS: 231-548-0
Synonyms
SULFUROUS ACID MONOSODIUM SALT;SODIUM HYDROGEN SULPHITE;SODIUM ACID SULFITE;SODIUM BISULFITE;SODIUM BISULFITE, META;PYROSULFITE;monosodium sulfite;NATRII METABISULFIS
The optimum concentration for E222 Sodium hydrogen sulphite is 38-40%, and it should not be used at concentrations above 40%.
E222 Sodium hydrogen sulphite can cause bowel disease when consumed by humans at high doses or after long-term exposure.
E222 Sodium hydrogen sulphite has also been shown to be toxic to aquatic organisms at high concentrations.
E222 Sodium hydrogen sulphite is a strong reducing agent that can reduce copper ions into copper metal and iron ions into iron metal.
E222 Sodium hydrogen sulphite has been studied extensively for its analytical applications, including its use in determining levels of dNTPs present in wastewater samples.
E222 Sodium hydrogen sulphite can react with DNA templates if they are present during the reaction solution.
E222 Sodium hydrogen sulphite is a chemical mixture with the approximate chemical formula NaHSO3.
E222 Sodium hydrogen sulphite is not a real compound, but a mixture of salts that dissolve in water to give solutions composed of sodium and bisulfite ions.
E222 Sodium hydrogen sulphite appears in form of white or yellowish-white crystals with an odor of sulfur dioxide.
E222 Sodium hydrogen sulphite is used in a variety industries such as a food additive with E number E222 in the food industry.
E222 Sodium hydrogen sulphite is a reducing agent in the cosmetic and in the bleaching applications.
E222 Sodium hydrogen sulphite is an inorganic sodium salt having hydrogensulfite as the counterion.
E222 Sodium hydrogen sulphite has a role as a mutagen and an allergen.
E222 Sodium hydrogen sulphite is an inorganic sodium salt and a sulfite salt.
E222 Sodium hydrogen sulphite contains a hydrogensulfite.
Also known as sodium acid sulfite or E222 Sodium hydrogen sulphite, NaHS03 is white crystals or crystalline powder that has a slight sulfurous odor and taste.
Specific gravity 1.48.
Strong irritant to skin and tissue.
E222 Sodium hydrogen sulphite is soluble in water,insoluble in alcohol,unstable in air,and non-combustible.
Derived by saturating sodium carbonate solution with sulfur dioxide and the solution crystallized.
Used as a chemical(sodium salts, cream of tartar), in vat dye preparation, textiles (antichlor, mordant, discharge), food preservative, bleaching groundwood, wool,etc., reducing agent, fermentation, antiseptic, cask sterilization (brewing), copper and brass plating,color preservative for pale crepe rubber, wood pulp digestion, analytical reagent,and as a dietary supplement.
Food additive in the category of chemical preservatives.
E222 Sodium hydrogen sulphite is a sodium salt of sulphuric acid, it comes in an unstable powder form, which reacts with oxygen to form a sulphate.
In acidic conditions E222 Sodium hydrogen sulphite forms sulphuric acid, which has preservative, oxidizing and bleaching properties, but also reduces the quantity of vitamins in foods.
E222 Sodium hydrogen sulphite Chemical Properties
Melting point: 150 °C
density: 1.48
vapor pressure: 40 hPa ( 20 °C)
storage temp.: Store at RT.
solubility: 300 g/L
form: Powder/Solid
Specific Gravity: 1.48
color: White
Odor: Slight odor of sulfur dioxide
PH: 4.5 (20°C in H2O)
Water Solubility: 300 g/L
Merck: 13,8660
Stability: Stable. Incompatible with strong oxidizing agents, strong acids.
Cosmetics Ingredients Functions: PRESERVATIVE REDUCING HAIR WAVING OR STRAIGHTENING ANTIOXIDANT
InChI: 1S/Na.H2O3S/c;1-4(2)3/h;(H2,1,2,3)/q+1;/p-2
InChIKey: DWAQJAXMDSEUJJ-UHFFFAOYSA-M
CAS DataBase Reference: 7631-90-5(CAS DataBase Reference)
EPA Substance Registry System: E222 Sodium hydrogen sulphite (7631-90-5)
E222 Sodium hydrogen sulphite is a white crystalline solid.
Slight odor of sulfur dioxide and a disagreeable taste.
Slowly oxidized to the sulfate on exposure to air
Uses
1. Used as reducing agent, food preservatives and bleach.
2. Used for the bleaching of cotton fabric and organic substance.
Used as reducing agents in dyes, paper, leather, chemical synthesis and other industries.
Used for the production of analgin and aminopyrine intermediates in pharmaceutical industry. Used as bleach, preservatives, and antioxidants of food grade products.
3. E222 Sodium hydrogen sulphite is reduction bleach allowed to use in China.
E222 Sodium hydrogen sulphite has bleaching effect on food and has a strong inhibitory effect on the oxidase within plant foods.
E222 Sodium hydrogen sulphite can be used for candied fruit, glucose, sugar, rock candy, caramel, candy, liquid glucose, dried fruit, dried vegetables, vermicelli, bamboo shoots, mushrooms and mushroom cans in provisions of our country, with a maximum use of 0.45g/kg; E222 Sodium hydrogen sulphite can also be used for potato starch with a maximum use amount of 0.2g/kg and a maximume residual amount (in terms of SO2) of less than 0.03 g/kg.
4. Used as reductants in analysis and also as bleach and bacterial inhibitors
5. Used as reducing agent, antiseptic, disinfectant and bleach.
E222 Sodium hydrogen sulphite is a preservative that exists as a powder, with a solubility of 1 g in 4 ml of water.
E222 Sodium hydrogen sulphite prevents discoloration and inhib- its bacterial growth.
E222 Sodium hydrogen sulphite is used in dried fruit to inhibit browning and maintain the bright color.
E222 Sodium hydrogen sulphite is found in reconstituted lemon juice.
Reducing agent; convenient source of sulfur dioxide.
E222 Sodium hydrogen sulphite is a preservative and anti-oxidant, it is most frequently used as a pH adjuster.
As disinfectant and bleach, particularly for wool; in dyeing for preparing hot and cold indigo vats; in paper-making in place of sodium hyposulfite to remove Cl from bleached fibers; as stripper (reducer) in laundering; to remove permanganate stains from skin and clothing; to render certain dyes sol; manufacture of sodium hydrosulfite; coagulating rubber latex; as preservative for deteriorative liqs or solutions used for technical purposes; as antiseptic in fermentation industries.
As preservative and bleach in food.
Pharmaceutic aid (antioxidant).
Cosmetics
E222 Sodium hydrogen sulphite functions as a hair-waving/straightening agent.
As of 1998, E222 Sodium hydrogen sulphite was used in 58 cosmetic products including hair conditioners, moisturizers, and hair dyes.
Food industry
E222 Sodium hydrogen sulphite is used to prevent discoloration, bleach food starches, and delay spoilage of the product.
In the US, EPA, FDA, and American Conference of Governmental Industrial Hygienists established a working place threshold limit value for sulfur dioxide (which is formed from bisulfite) of 2ppm averaged over 8 hours, and a 3-hour level of 5ppm.
Even with this threshold established, the FDA recognized E222 Sodium hydrogen sulphite as "generally recognized as safe" compound.
Sulfites in food can be assayed by the Monier-Williams type procedure, HPLC after extraction, and Flow Injection analysis.
Textile industry
E222 Sodium hydrogen sulphite is used as an antichlor in the textile industry.
Antichlors are very useful in the textile industry because bleaching of compounds using chlorine is a standard practice.
Production method
Add sodium sulphite mother liquor (containing NaHSO3 40%, Ph value of 3 to 4) slowly into soda ash to generate sodium sulfite solution (to the slurry Ph value of 7~8 for the end); transfer the above sodium sulfite solution into series reactors (2 to 3) to absorb the SO2 gas (10% to 13%) from the combustion of sulfur, forming sodium bisulfite (to the reaction temperature no longer rising for the end).
In the reaction process, a large number of crystals precipitate out, which is centrifuged to obtain the wet goods with moisture content of 6% to 10%, and then dehydrated by air drying at 250 to 300 ° C to make the final products.
2NaHSO3 + Na2CO3 → 2Na2SO3 + H2O + CO2↑
NaSO3+H2O→2NaHSO3
Absorb sulfur dioxide from the gas of sulfuric acid production with soda ash solution to generate sodium bisulfite.
After further centrifugal separation and air drying at 250~300 ° C, the final E222 Sodium hydrogen sulphite is obtained.
Na2CO3 + 2SO2 + H2O → 2NaHSO3 + CO2↑
Synthesis
E222 Sodium hydrogen sulphite solutions can be prepared by treating a solution of suitable base, such as sodium hydroxide or sodium bicarbonate with sulfur dioxide.
SO2 + NaOH → NaHSO3
SO2 + NaHCO3 → NaHSO3 + CO2
Attempts to crystallize the product yield sodium metabisulfite (also called sodium disulfite), Na2S2O5.
Upon dissolution of the metabisulfite in water, bisulfite is regenerated:
Na2S2O5 + H2O → 2 Na+ + 2 HSO3−
E222 Sodium hydrogen sulphite is formed during the Wellman-Lord process.
