Quick Search
Sodium metabisulfite = Sodium pyrosulfite
CAS Number : 7681-57-4
EC Number : 231-673-0
Sodium metabisulfite or sodium pyrosulfite (IUPAC spelling; Br. E. sodium metabisulphite or sodium pyrosulphite) is an inorganic compound of chemical formula Na2S2O5.
The substance is sometimes referred to as disodium metabisulfite.
Sodium metabisulfite is used as a disinfectant, antioxidant, and preservative agent.
Sodium disulfite can be prepared by treating a solution of sodium hydroxide with sulfur dioxide.
When conducted in warm water, Na2SO3 initially precipitates as a yellow solid.
With more SO2, the solid dissolves to give the disulfite, which crystallises upon cooling.
SO2 + 2 NaOH → Na2SO3 + H2O
SO2 + Na2SO3 → Na2S2O5
which yields a residue of colourless solid Na2S2O5.
Chemical structure
Sodium metabisulfite anion metabisulfite consists of an SO2 group linked to an SO3 group, with the negative charge more localised on the SO3 end.
Sodium metabisulfite S–S bond length is 2.22 Å, and the "thionate" and "thionite" S–O distances are 1.46 and 1.50 Å, respectively.
Reactivity
Main article: Bisulfite § Reactions
Upon dissolution in water, bisulfite is generated:
Na2S2O5 + H2O → 2 Na+ + 2 HSO3−
Sodium and potassium metabisulfite have many major and niche uses.
Sodium metabisulfite is widely used for preserving food and beverages.
Sodium metabisulfite is added as an excipient to medications which contain adrenaline (epinephrine), in order to prevent the oxidation of adrenaline.
For example, it is added to combination drug formulations which contain a local anaesthetic and adrenaline, and to the formulation in epinephrine autoinjectors, such as the EpiPen.
Sodium metabisulfite lengthens the shelf life of the formulation, although the sodium metabisulphite reacts with adrenaline, causing it to degrade and form epinephrine sulphonate.
In combination with sodium hydrosulfite it is used as a rust-stain remover
Sodium metabisulfite is used in photography.
Concentrated sodium metabisulfite can be used to remove tree stumps.
Some brands contain 98% sodium metabisulfite, and cause degradation of lignin in the stumps, facilitating removal.
Sodium metabisulfite is also used as an excipient in some tablets, such as paracetamol.
A very important health related aspect of this substance is that it can be added to a blood smear in a test for sickle cell anaemia (and other similar forms of haemoglobin mutation).
The substance causes defunct cells to sickle (through a complex polymerisation) hence confirming disease.
Sodium metabisulfite is used as a bleaching agent in the production of coconut cream
Sodium metabisulfite (or liquid SO2) is commonly used as an antimicrobial and antioxidant in winemaking; bottled wine indicates its use with the label "Contains Sulfites" in the US.
Sodium metabisulfite is used as a reducing agent to break sulfide bonds in shrunken items of clothing made of natural fibres, thus allowing the garment to go back to its original shape after washing
Sodium metabisulfite is used as a SO2 source (mixed with air or oxygen) for the destruction of cyanide in commercial gold cyanidation processes.
Sodium metabisulfite is used as a SO2 source (mixed with air or oxygen) for the precipitation of elemental gold in chloroauric solutions.
Sodium metabisulfite is used in the water treatment industry to quench residual chlorine.
Sodium metabisulfite is used in tint etching iron-based metal samples for microstructural analysis.
Sodium metabisulfite is used as a fungicide for anti-microbe and mould prevention during shipping of consumer goods such as shoes and clothing.
Plastic stickers and packaging containing the anhydrous, sodium metabisulfite solid active ingredient are added prior to shipping.
The devices absorb moisture from the atmosphere during shipping and release low levels of sulfur dioxide.
Sodium metabisulfite is used for preserving fruit during shipping.
Sodium metabisulfite is used as a solvent in the extraction of starch from tubers,fruit, and cereal crops.
Sodium metabisulfite is used as a pickling agent to treat high pressure reverse osmosis water desalination membranes for extended storage periods between uses.
Names
Other names
Sodium pyrosulfite
Sodium disulfite
Identifiers
CAS Number : 7681-57-4
ChEBI : CHEBI:114786
ChEMBL : ChEMBL2016976
ECHA InfoCard :100.028.794
EC Number: 231-673-0
E number :E223 (preservatives)
PubChem CID: 656671
RTECS number : UX8225000
UNII : 4VON5FNS3C
CompTox Dashboard (EPA) : DTXSID0029684
Properties
Chemical formula: Na2S2O5
Molar mass :190.107 g/mol
Appearance :White to yellow powder
Odor :Faint SO2
Density :1.48 g/cm3
Melting point :170 °C (338 °F; 443 K) decomposition begins at 150 °C
Solubility in water : 45.1 g/100 mL (0 °C)
65.3 g/100 mL (20 °C)
81.7 g 100 mL (100 °C)
Solubility : Very soluble in glycerol
Slightly soluble in ethanol
Hazards
GHS labelling:
Pictograms :GHS05: CorrosiveGHS07: Exclamation mark
Signal word :Danger
Hazard statements: H302, H318
Precautionary statements :P264, P270, P280, P301+P312, P305+P351+P338, P310, P330, P501
Classification:Sulphate
Type:Sodium Metabisulfite
CAS No.:7681-57-4
MF:Na2S2O5
EINECS No.:231-673-0
Place of Origin:China
Grade Standard:Food Grade, Industrial Grade
Purity:90% 93% 96%, 90% 93% 96%
Appearance:white crystal powder, White powder
Application:preservative
Brand Name:BANGZE
Model Number:BZ-019
Product name:Sodium metabisulphite
CAS number:7681-57-4
EINECS:231-673-0
MOQ:1 Ton
Packing:25kg bag
Grade:Industrial/ food grade
Sodium metabisulfite appears as a white crystalline or powder solid with a slight sulfur odor.
Toxic by inhalation .
Strongly irritates skin and tissue.
Noncombustible, but may decompose to emit toxic oxide fumes of sulfur and sodium when heated to high temperature.
A corrosive acid when mixed with water.
Used as a food preservative and as a laboratory reagent.
Sodium disulfite is an inorganic sodium salt composed of sodium and disulfite ions in a 2:1 ratio.
Sodium metabisulfite has a role as a food antioxidant. It contains a disulfite.
Sodium metabisulfite (SMBS) is a white/creamy water soluble chemical.
Sodium metabisulfite chemical formula is Na2S2O5, an inorganic compound made up of sodium, sulfur and oxygen.
Sodium metabisulfite is used in many industries, such as food, textiles, mining, wastewater treatment, and paper.
Sodium metabisulphite (SMBS), the commercially produced salt of sulphurous acid, is a preservative used to extend the shelf life of meat products such as fresh sausages and burgers, even though it can have adverse effects on some people, especially asthmatics.
SMBS is not permitted in several countries for use in meat products. Chemically, SMBS contains 67% sulphur dioxide (SO2).
When SMBS is applied to a meat product, the SMBS instantly reacts with water and, as a rule of thumb, around 50–55% added SMBS can be found analytically in the meat product as SO2.
Some SO2 is ‘lost’ as a result of countless reactions and cannot be detected any longer.
Therefore meat products are not analysed with regard to their SMBS content.
Sodium metabisulfite level of SO2 has to be measured instead and food standards refer to the SO2 level, rather than the SMBS level, of a product.
In countries such as Australia and New Zealand, 500 ppm of SO2 is the maximum per kilogram of fresh sausage.
In the UK, SMBS is permitted in certain meat products only and it is not permitted in most other countries within the EU.
One of the reasons that it is not permitted in some countries is that SMBS causes a significant loss in vitamins such as thiamin in foods.
Sodium metabisulfite degradation of SO2 within a meat product depends primarily on the microbiological status of the meat and fat materials used and on the storage temperatures that the meat product is exposed to.
Excess levels of bacteria in a fresh meat product rapidly reduce the level of residual SO2 in a fresh meat product, such as a fresh sausage, and shelf life overall is considerably shortened.
Elevated storage temperatures also reduce the level of SMBS within a fresh sausage significantly and shortened shelf life is the result.
SMBS is more effective against Gram-negative such as Entero-bacteriaceae than Gram-positive bacteria.
SMBS is also more effective at low pH values.
As explained above, most food standards worldwide express the level of SMBS present in a meat product as SO2 and around 50–55% of added SMBS can be found as SO2 in the finished meat product straight after producing a meat product such as fresh sausage.
As an example, 500 ppm of SO2 would generally be obtained by adding 1.1 g of SMBS to every kilogram of uncooked meat product.
By adding SMBS to meat products such as fresh sausage, SO2 is produced in an acid environment (as is the case in meat products) from SMBS (Na2S2O5 → SO2).
SO2 is absorbed into bacterial cells and reacts with water in the cell.
Sulphurous acid is obtained (SO2 + H2O → H2SO3), which is not stable and falls apart by donating hydrogen ions .
In a subsequent reaction, negatively charged ions are obtained as well.
Sulphurous acid, whilst present as an acid, acts as a very strong preservative and the undissociated acid molecule is the active agent.
Sodium metabisulfite optimal pH value for maximum effectiveness of sulphurous acid as a preservative would be 5.1 because it would then be present in its undissociated form.
However, such low pH values are generally not found in meat products as protein activation and WBC are very poor at such pH levels (IEP).
SO2 on its own also interferes with the enzyme structure of bacterial cells.
Besides SO2, sulphurous acid is present in different levels of dissociation as H2SO3, and at the same time.
SO2 and sulphurous acid have a strong impact on bacterial growth whilst hydrogen sulphate ions such as HSO3− ions act as weak antibacterial agents.
Sulphate ions such as SO3− have a fairly weak impact on bacterial growth.
Sulphite ions are reducing agents with a lone pair of electrons, which makes them highly reactive and they form bonds with a wide range of other substances present inside the cell.
Sodium metabisulfite also bind to oxygen and create radicals, which interfere in many different ways with processes inside the cell such as protein synthesis and DNA replication, systems of energy production and activities of cell membranes.
Generally, at least 150 ppm of SO2 has to be present in a meat product to have a significant effect in extending shelf life.
Sodium metabisulfite introduction of SMBS into cooked meat products such as sausages and hams is occasionally practised but has little effect in extending the shelf life of these products after heat treatment.
SMBS controls bacteria growth and even kills bacteria to a certain degree prior to thermal treatment but, once a meat product is cooked and all proteins are denatured, the impact of residual SMBS in the cooked meat product regarding the extension of shelf life is negligible.
Sodium metabisulfite is because SMBS requires free water to form SO2 and water is already bound solidly in one way or another in the cooked product.
Hence, all vegetative bacteria are killed and SMBS has no impact against spores, which have survived pasteurization.
SMBS also improves and stabilizes the colour of fresh sausages as it is a reducing agent donating electrons and as such slowing the oxidation of myoglobin into metmyoglobin as well as reducing metmyoglobin into reduced myoglobin.
The formation of metmyoglobin is greatly delayed and reduced as a consequence.
Metmyoglobin causes a brownish-grey colour in meat product and the presence of SO2 helps to maintain the ‘original’ red colour.
Experts describe this by saying that the ‘bloom’ of the sausage is maintained.
Sodium Metabisulphite (SMBS) is a white/creamy chemical which is soluble in water.
Sodium metabisulfite chemical formula is Na2S2O5, an inorganic compound made up of sodium, sulfur and oxygen, and used in many industries such as food, textile, mining, water treatment, construction chemicals and paper.
APPLICATION FIELDS
Anthichlore in bleaching in textile industry
Antiseptic in production of cellulose esters
Main raw material in production of sodium hydrosulfite, aromatic alcohols and aldehydes
Preservative and disinfactant in food and baverage industries as a source of sulfur dioxide
Antiseptic in fermantation process
Color removing in paint and leather industries
Disinfectant in cosmetic and canned industry
Various applications in paper, fiber, rubber and adhesive industries
Sodium metabisulfite (SMBS), one of the sulfites that can be used as a preservative, antioxidant and bleaching agent in food with the European food additive number E223.
Sodium metabisulfite is a reducing agent that commonly used for the preservation of fresh & dried fruits, vegetables and wines.
How is Sodium Metabisulfite made?
Sodium metabisulfite can be made from the reaction between sulfur dioxide with sodium carbonate.
The following is the reaction equation: SO2 + Na2SO3 → Na2S2O5
Here is the manufacturing process came up by Solvay:
Reaction between sodium carbonate (Na2CO3) and sodium bisulfite (NaHSO3) solution to form the mixed solution of sodium bisulfite and sodium sulfite (Na2SO3).
Reaction equation: Na2CO3+2NaHSO3 = Na2SO3+H2O+CO2
Add excess sulfur dioxide (SO2) to the above solution to convert sodium sulfite to sodium bisulfite and also obtain the dissolved sulfur dioxide.
Reaction equation: Na2SO3+H2O+SO2=2NaHSO3
Convert the dissolved sulfur dioxide to sodium bisulfite by adding an alkali ingredient, e,g, sodium carbonate, sodium hydroxide, or sodium sulfite, or the mixtures. Reaction equation: Na2CO3+H2O+SO2=2NaHSO3+CO2
Obtaining sodium metabisulfite (Na2S2O5) through two sodium bisulfite molecules reacts itself by cooling the above sodium bisulfite solution, and follows purification and drying processes to produce crystals or powder.
Reaction equation: 2NaHSO3 = Na2S2O5+H2O
Properties
Appearance
White crystals or crystalline powder. Slowly oxidized to Na2SO4 (sodium sulfate) and release sulfur dioxide (SO2) gas if exposed to air and moisture.
SO2 is also released by the reaction with acid.
Solubility
Soluble in water and its water solubility increases with temperature, 54g/100ml at 20°C and 81.7g/100ml at 100°C.
Sodium metabisulfite produces sodium bisulfite (HSO3−) when dissolved in water and the aqueous solution is acidic with the PH 4.0-5.5 (10 % aqueous solution).
Na2S2O5 + H2O = 2 NaHSO3
Soluble in glycerin, slightly soluble in ethanol, insoluble in benzene.
Structure
chemical structure of Sodium Metabisulfite
Image Source
What’re the Uses of Sodium Metabisulfite?
Sodium metabisulfite is a strong reducing agent that can react with oxidizing agents as the sulfur atom in it with a positive valence of 4, the maximum valence of which is 6.
That is the mechanism why sodium metabisulfite is a multifunctional ingredient that can be used as a preservative, antioxidant and bleaching agent in agricultural food products, wine and other applications.
Preservative
SMBS is a sulfur-containing preservative that inhibits the oxidase in the food, and also can block the normal physiological oxidation process of microorganisms and thus inhibit the reproduction of microorganisms in food preservation.
Antioxidant
Since sulfite is a strong reducing agent, it reacts with oxygen from fruits and vegetables and also inhibits oxidase activity, so it prevents food spoilage caused by oxidation and protects vitamin C in them.
Bleaching agent
Reduce the colored material to a bright and fresh color or prevent/slow oxidative browning.
The following are its main purposes in food:
Wine
You may have seen sulfur dioxide in the ingredients list of wine, but not like other ingredients you notice in the label, sulfur dioxide is not directly added to wine, it is formed by the adding of sodium metabisulfite or potassium metabisulfite.
The following are the reaction equation of Na2S2O5 in wine:
Na2S2O5 + H2O <===> 2Na+ + 2(HSO3)-
HSO3- + H+ <===> H2O + SO2
Sulfur dioxide plays an important role in almost every manufacturing process of winemaking, from grape picking to bottling.
It is mainly to inhibit the growth of yeast and bacteria, and therefore preserve the wine fresh and extend the shelf life.
Sodium metabisulfite or potassium metabisulfite is commonly added to wines, ciders, or maybe beers as an antioxidant, preservative and stabilizer.
Also, it can be used to clean and sanitize wine equipment and wine bottles.
Bakery
Like L-cysteine, sodium metabisulfite functions as a reducing agent in biscuit/pastry dough which loosens the dough, reduces the rest time and accelerates the kneading process by reacting with disulfide bonds and generating thiolsulfate esters in gluten protein after hydrolyzed to bisulfite (HSO3−) in water.
Processed fruit products
Like other sulfites (e.g. sodium sulfite, sulfur dioxide), sodium metabisulfite can be used as both a preservative and antioxidant in processed fruit products to slow browning reactions, as well as inhibit the growth of certain microorganisms.
Industrial
Industrial grade sodium metabisulfite is used in a wide range of applications:
Pharmaceuticals: used for the purification of chloroform, phenyl propyl sulfone and benzaldehyde.
Rubber: a coagulant.
Printing and dyeing: as a dechlorination agent for bleached cotton.
Leather: impart leather the properties of soft, waterproof, folding resistance in leather treatment.
Surfactants and polymerization: as a sulfonating agent and reducing agent.
Gold refining: as a reducing agent to precipitate gold out of an aqua regia solution by reducing the Au³⁺ to Au.
Sodium metabisulfite is used as a preservative and antioxidant in food.
Sodium metabisulfite is used as a cleaning agent for potable water desalination systems and used to remove chloramine from drinking water after treatment.
INCI: Sodium Metabisulphite
Chemical Formula: Na2S2O5
CAS Number: 7681-57-4
Usage Areas
As a preservative, additive and antioxidant in food industry
Dechlorination in general wastewater, power, paper & pulp and textile water treatment plants
Cyanide detoxification in mines
As an important agent in acidifying fixing baths
Sodium metabisulfite food industry as additive (E223) preservative, antioxidant and antimicrobic for fruits (dried, glazed and
candled), vegetables (onions, potatoes, etc.), juices (citrus and grapes) and fish (shrimps and prawns).
Sodium metabisulfite silage treatment as antifermentative.
Sodium metabisulfite starch and sweeteners production as bacteriostatic.
Sodium metabisulfite the photographic industry as component of developer bath.
Sodium metabisulfite desalting plants with reverse osmosis (for removing the excess of chlorine and for membrane preservation) or in drinking water treatment (to remove the excess of chlorine).
Sodium metabisulfite chemical synthesis in the production of acrylic fibres, vitamin K and A, pharmaceutical intermediates, etc
What is Sodium Metabisulfite?
Sodium metabisulfite is a reducing agent used in dough.
Sodium metabisulfite is used frequently in cookie and cracker production.
Sodium metabisulfite is also used as a preservative for baked goods, wine, dried fruit and jams due to its antioxidant capacity.
Sodium metabisulfite is an antioxidant which serves as a preservative for dried fruit that is used in baked products.
Origin
Sodium metabisulfite can be produced by crystallizing a solution of sodium bisulfite.
Sodium bisulfite results from introducing sulfur dioxide into a solution of sodium sulfite.
Sodium sulfite, in turn, can be produced by introducing sulfur dioxide into sodium hydroxide.
sodium metabisulfite reducing agent dried fruit
Chemical structure of sodium metabisulfite.
Function
As a reducing agent, sodium metabisulfite makes the dough flexible for better sheeting, and this is the rationale for sodium metabisulfite’s working as reducing agent.
It reacts with the cysteine amino acids in dough, creating S-sulfocysteine residues within the protein structure, which inhibit the restoration of disulfide bonds.
Essentially, sodium metabisulfite acts as a cap, covering the reactive thiol group on cysteine, so it is unavailable to reform disulfide bonds.
Lack of adequate disulfide bonds means that dough can’t form a strong gluten network.
Recent studies show that the presence of sodium metabisulfite slows down the Maillard reaction, thereby reducing levels of acrylamide.
Application
Compared with other reducing agents, like glutathione and L-cysteine, sodium metabisulfite has the greatest reducing capacity.
There is far greater danger of over-dosing a formulation.
Sodium metabisulfite reducing power is one reason that sodium metabisulfite is not the preferred reducing agent in the industry.
Sodium metabisulfite is usually used at 0.03% dry flour weight in cracker production.
Sodium metabisulfite is rarely used in bread dough production.
What is Sodium Metabisulfite?
Sodium metabisulfite is a chemical compound with the formula Na2S2O5.
Sodium metabisulfite is also known as sodium pyrosulfite and sodium disulfite.
Na2S2O5 is an ionic compound containing the sodium cation (Na+) and the metabisulfite anion (S2O52-).
In its standard state, sodium metabisulfite exists as a white or yellowish-white powder, as shown below.
Sodium metabisulfite compound has a faintly pungent odour similar to that of sulfur dioxide.
Sodium metabisulfite is important to note that sodium metabisulfite may induce allergic reactions in humans who are sensitive to sulfites.
Structure
As mentioned earlier, sodium metabisulfite is made up of two sodium ions and one metabisulfite ion.
Sodium metabisulfite structure of an Na2S2O5 molecule is illustrated below.
Sodium metabisulfite disulfite (or metabisulfite) anion features a direct connection between the two sulfur atoms.
Sodium metabisulfite first sulfur atom is bonded to three oxygen atoms and exhibits an oxidation state of +5 whereas the other sulfur atom exhibits an oxidation state of +3 and is bonded to two oxygen atoms.
Preparation
When a solution of NaHSO3 (sodium bisulfite) is saturated with SO2 (sulfur dioxide) and then allowed to evaporate, a residue of sodium metabisulfite is obtained.
The equilibrium reaction can be written as follows.
2HSO3– ⇌ S2O52- + H2O
The free sodium ions in the solution form an ionic bond with the metabisulfite ion, resulting in the formation of solid Na2S2O5 residue.
Physical Properties
Sodium sulfite has a white or whitish-yellow appearance in its solid-state.
Sodium metabisulfite has a faintly pungent smell similar to SO2.
Na2S2O5 is fairly soluble in water – its solubility corresponds to 65.3g/100mL at a temperature of 20o
This compound is highly soluble in glycerol but not very soluble in ethanol.
Chemical Properties
When introduced to water, sodium metabisulfite liberates sulfur dioxide gas which has a very pungent and unpleasant odour.
Sodium metabisulfite gas can also lead to respiratory problems in humans.
SO2 gas is liberated by this compound on exposure to strong acids such as hydrochloric acid.
The chemical equation for this reaction is given by: 2HCl + Na2S2O5 → 2SO2 + 2NaCl + H2O
When heated, sodium metabisulfite undergoes decomposition to form sodium sulfite and sulfur dioxide.
Sodium metabisulfite chemical reaction is: Na2S2O5 → SO2 + Na2SO3
Uses
Sodium sulfite has several applications as an antioxidant, a preservative and as a disinfectant.
Some important uses of this compound are listed below.
Na2S2O5 is one of the primary ingredients used in Campden tablets.
Sodium metabisulfite is also used to sanitize the equipment used for winemaking.
This compound is also used to increase the shelf life of several local anaesthetics.
Concentrated Na2S2O5 can be used for the removal of tree stumps since it degrades the lignin in it.
Sodium sulfite is also used to test for sickle cell diseases.
When gold is dissolved in aqua regia, it can be precipitated out with the help of this compound.
Since it can act as an oxygen scavenger, Na2S2O5 is used as a corrosion inhibitor in the oil industry.
This compound is also used in the treatment of wastewater since it can reduce hexavalent chromium into its trivalent form.
Frequently Asked Questions
What are the uses of sodium metabisulfite?
Sodium metabisulfite, a chemical compound with the formula Na2S2O5, is widely used as an antioxidant in pharmaceutical formulations.
Sodium metabisulfite is also used as a disinfectant and as a food preservative in many industries.
List some examples of foods that contain sodium metabisulfite
Examples of food items that contain sodium metabisulfite are listed below:
Is sodium metabisulfite organic or inorganic?
Sodium metabisulfite, also known as sodium pyrosulfite, is an inorganic compound with the chemical formula Na2S2O5.
The IUPAC spelling of the compound is sodium metabisulphite or sodium pyrosulphite.
To learn more about sodium metabisulfite and other important sodium compounds (such as sodium thiosulfate), register with BYJU’S and download the mobile application on your smartphone.
A white crystalline or powder solid with a slight sulfur odor.
Toxic by inhalation .
Strongly irritates skin and tissue.
Noncombustible, but may decompose to emit toxic oxide fumes of sulfur and sodium when heated to high temperature.
A corrosive acid when mixed with water.
Used as a food preservative and as a laboratory reagent.
Sodium Metabisulfite or Sodium Pyrosulfite is an inorganic compound of chemical formula Na2S2O5.
The substance is sometimes referred to as disodium metabisulfite.
Sodium metabisulfite is used as a disinfectant, antioxidant, and preservative agent.
Due to SODIUM METABISULPHITE acting as a sterilizer and an antioxidant, it is used in almost all commercial productions of beer and wine.
By adding small amounts to the pressed juice, it will kill any moulds that are already resistant to alcohol.
Sodium metabisulfite also prevents oxidation, which keeps the flavour of the beverage.
SODIUM METABISULPHITE antibacterial nature makes it useful in the process of purifying water.
Sodium metabisulfite can be applied to the cleaning of water pipes and in desalinisation equipment such as reverse osmosis membranes.
Due to these antibacterial and antioxidation properties, SODIUM METABISULPHITE is frequently used to preserve dried foods, canned goods, corn syrup and fruit concentrates.
Sodium metabisulfite allows the food to keep for much longer, and prevents discolouration and mould.
Sodium Metabisulfite (sodium bisulfite anhydrous, sodium pyrosulfate, SMBS, MBS) is a white inorganic crystalline compound with the chemical formula Na2S2O5.
Sodium metabisulfite is an inorganic compound used as an antioxidant, a preservative in food, or for dichlorination in a broad range of industrial applications.
INEOS Calabrian is the only manufacturer of sodium metabisulfite in North America.
Three things set INEOS Calabrian’s sodium metabisulfite apart: exceptional quality, high consistency and a low environmental footprint.
Applications
Cyanide destruction and leaching in the mining industry (Manganese, Gold, Cobalt, Iodine, Nickel and Silver)
Dechlorination in municipal wastewater, pulp & paper, power, and textile water treatment plants
Disinfectant
Water treatment in leather tanning process
Oxygen scavenger
Cherry brining process
Preservative in photo developer solutions
Antioxidant
Used in production of cleaning agents, detergents, and soaps
Autre langue : Métabisulfite de sodium
INCI name: SODIUM METABISULFITE
EINECS/ELINCS number: 231-673-0 / -
Food additive: E223
Classification: Regulated, Preservative
Restriction in Europe: III/99 V/9
The maximum concentration allowed in ready-to-use cosmetic preparations is 0.2% (free SO2).
Its functions (INCI)
Antioxidant : Inhibits reactions favored by oxygen, thus avoiding oxidation and rancidity
Preservative : Inhibits the development of microorganisms in cosmetic products.
Reducing : Changes the chemical nature of another substance by adding hydrogen or removing the oxygen
Description
Sodium Metabisulphate is the powdered form of Campden tablets.
Sodium metabisulfite is mainly used in beer making to remove chlorine or chloramine from water, this improves the flavour of the final product.
Add 0.5g to 25 litres to treat water for chlorine
Sold in resealable foil bags.
Instructions for use;
Sodium Metabisulphite can be used in two ways, either as a sanitiser or as an antioxidant to stabilise and preserve your beer or wine.
We don’t recommend using it as a steriliser though and would point you in the direction of our NBS No Rinse (SKU: CHE-02-001) product.
To use as an antioxidant.
Add;
0.116g per litre
0.44g per US gallon (3.8 litres)
2.2g per 5 US Gallons (19 litres)
To use as a steriliser.
Dissolve 15g per litre in warm water. The equipment to be sterilised needs to be immersed in the solution for a period of at least 10 minutes.
Safety instructions.
Skin contact:
Wash immediately with plenty of soap and water.
Eye contact:
Bathe the eye with running water for 15 minutes.
Ingestion:
Wash out mouth with water. Do not induce vomiting.
If conscious, give half a litre of water to drink immediately.
Transfer to hospital as soon as possible.
Inhalation:
Remove casualty from exposure ensuring one’s own safety whilst doing so. Consult a doctor.
Sodium metabisulfite is an inorganic salt substance. It is also known as Disodium or Sodium Pyrosulfite.
Sodium metabisulfite is a raw material that is normally solid but can melt at 150 degrees Celsius.
Sodium metabisulfite has been used for food preservation for many years.
Directions for use
1 tsp dissolved in 1L of water is adequate for general purposes.
Additional Information
pH Level pH: 3.5 – 5.0 (5%)
Sizes 25 Kg
Scent Pungent
Applications
Sodium metabisulfite preserves food.
Commonly used as a steriliser and antioxidant in beer and wine making.
Sodium Metabisulfite
sodium metabisulphite, also called sodium pyrosulfite and smbs, white crstalline powder, 97%min purity, industrial grade and food grade, ph value 4-4.6, easy to oxidize and decompose. normal package 25kgs/plastic woven bag.sodium
metabisulfite for sale
Sodium metabisulfite is an inorganic compound composed of sodium, sulfur and oxygen.
Sodium metabisulfite chemical formula is Na2S2O5 .
Sodium metabisulfite typically comes in a white, or yellowish-white crystalline powder.
Sodium metabisulfite easily dissolves in water, which leaves that familiar sulfur (rotten egg) smell
Sodium Metabisulfite plays an important part in the treatment of water, wastewater and waste as a strong reducing agent.
Sodium Metabisulfite also assists in the de chlorination of drinking water as well as in the chlorine removal in waste waters .
sodium metabisulfite in food
We are sodium metabisulfite manufacturers, sodium metabisulphite price very competitive. sodium pyrosulfite can be used as sodium metabisulfite preservative.
sds sodium metabisulfite can be offered.
sodium metabisulfite na2s2o5 food grade
sodium metabisulfite na2s2o5 food grade, white powder, used for fruits and vegetables perservatives, bleaching agents, anti-oxidants, loose agents.
sodium metabisulfite food grade
We are sodium metabisulfite manufacturers.
Sodium metabisulfite, also called sodium pyrosulfite, sodium metabisulfite food grade, sodium metabisulfite uses in food: sodium metabisulfite in food preservation, sodium metabisulphite antioxidant, sodium metabisulfite food additive, sodium metabisulphite wine.
sodium metabisulfite na2s2o5
sodium metabisulphite na2s2o5, cas 7681-57-4, pure white powder, 97%MIN purity, industry grade food grade,sodium metabisulfite uses in water treatment; preservatives, bleaching agent, anti-oxidant in food industry; dechlorination agent for bleached cotton, cotton cooking auxiliary agent in textile industry, etc. Annual Production 50,000MT. Package 25KG/Bag.
Sodium Metabisulphite also known as Natriumpyrosulfit, is needed for neutralizing of chlorine produced in electrolysis ballast water treatment systems.
Specifications
Simple and effective method for dechrlorination of ballast water
Product is very easy to use and is in compliance with the International Ballast Water Management Convention
Sodium metabisulfite can be used for all ballast water tanks.
Hans Buch holds a stock for this and can deliver within short notice.
Description
Catalogue Number 106528
Synonyms Sodium metabisulfite, Sodium pyrosulfite, Disulfite, Pyrosulfite
Product Information
CAS number 7681-57-4
EC index number 016-063-00-2
EC number 231-673-0
Grade ACS,Reag. Ph Eur
Hill Formula Na₂O₅S₂
Molar Mass 190.11 g/mol
HS Code 2832 10 00
Quality Level MQ300
Physicochemical Information
Density 2.36 g/cm3 (20 °C)
Melting Point 300 °C (decomposition)
pH value 4.5 (50 g/l, H₂O, 20 °C)
Bulk density 1000 - 1200 kg/m3
Solubility 650 g/l
Toxicological Information
LD 50 oral LD50 Rat 1540 mg/kg
LD 50 dermal LD50 Rat > 2000 mg/kg
What is Sodium metabisulfite ?
Sodium metabisulfite has a molecular formula of Na2O5S2 and is consider an antioxidant.
Sodium metabisulfite is used as a food preservative and in the commercial wine making industry.
In the paper and textile industry it is used as a bleaching agent.
Sodium metabisulfite can be associated with serious allergic reactions.
Although primary exposure in children is through foods, serious reactions have also occurred after oral, inhalational, parenteral, and ophthalmic administration of sulfite-containing drugs.
Reactions to sulfites most often occur in patients with reactive airway disease like asthma.
Symptoms most frequently reported include wheezing, dyspnea, and chest tightness; anaplylaxis has also been reported.
Sulfites have been removed from metered-dose inhalers, including albuterol.
The diagnosis of a sulfite sensitivity is made by history and through a challenge testing with a qualified physician. Read food package labels carefully to avoid sulfites in foods.
In addition, drug manufacturers are required to list the inclusion of sulfites in medicine product labeling. Metabisulfites may be present in some intravenous preparations.
People who do not have a sensitivity to sulfites rarely show any reaction.
Sodium metabisulphite is used to neutralize regular bleach that can stay in fabric even after rinsing.
After bleaching, soaking in a solution of metabisulphite prevents the deterioration of fibers by bringing the pH back to neutral.
Introduction
Sodium Metabisulfite has the chemical formula Na2S2O5 and its molecular mass is 190.107g/mol.
Sodium metabisulfite is a sulfur-containing ionic compound of sodium.
Sodium has a positive charge while metabisulfite (S2O52-) has a negative charge.
Sodium metabisulfite is called Metabisulfite due to the presence of two S atoms.
Meta term refers to the direct bond present between two S atoms.
Sodium metabisulfite is a well-known antioxidant being used in pharmaceuticals.
Sodium metabisulfite is white in color and solid powder form.
In this article, We will discuss the structure, chemical and physical properties, uses of Sodium metabisulfite.
Structure
We know that the chemical formula of Sodium Metabisulfite is Na2S2O5.
Sodium metabisulfite has two sodium atoms, two sulfur, and five oxygen atoms. Na+ is balancing the charge in the structure.
Two sulfur atoms are directly attached to each other through a single bond.
A sulfur atom which has 3 Oxygen atoms, has an oxidation state of +5.
Another sulfur atom has an oxidation number of +3. The structure of this compound is shown below:
Preparation
There are a number of methods available to synthesize sodium metabisulphite.
One of them is by using Sodium sulfite and sodium bisulfite solution.
Sulfur Dioxide is added to this solution. It maintains the pH of the solution. NaOH is added to the above solution.
In the solution, There is an equilibrium between the ions as shown below:
2HSO32- ⇌ S2O2-5 + H2O
When NaOH is added to the above solution, free Na+ ions form with bisulfite ions and Sodium metabisulfite is achieved.
Sodium metabisulfite enhances the crystallization process per cycle and more yield of Sodium Metabisulfite is achieved.
Properties
Physical Properties
Sodium metabisulfite is white in color, solid, and in powder form.
Sodium metabisulfite has a similar odor to Sulfur dioxide.
The molar mass of sodium metabisulfite is 190.107 g/mol.
Sodium metabisulfite has a melting point of 1800C, but it decomposes around 1500C.
On boiling, It decomposes readily.
Chemical Properties
sodium metabisulfite pH is maintained at 4.6 while preparing the solution. So, it is acidic in nature.
Sodium metabisulfite is non-combustible in nature. When heated at high temperature, it releases toxic flames of oxides of sulfur
When it is mixed in water, it releases sulfur dioxide. Sodium metabisulfite is very harmful to the lungs. It has a pungent strong smell.
When it is treated with strong acids, it releases SO2. The reaction is shown below:
2HCL + Na2S2O5 ⇌ 2SO2 + 2NaCl + H2O
Sodium Metabisulfite Uses
It is the most commonly used preservative for baked goods, wines, jams, cookies.
Sodium metabisulfite acts as a reducing agent in the dough, it helps in making batter softer, easier to knead.
Sodium metabisulfite is a well-known antioxidant used in pharmaceuticals.
Sodium metabisulfite is helpful in tests of sickle cell anemia.
Sodium metabisulfite is used in industries as a corrosion inhibitor because it is an oxygen scavenger.
Sodium metabisulfite is used in wastewater treatment as it is a good reducing agent.
Sodium metabisulfite is used as a sanitizing ingredient, to clean the tools of winemaking.
Did You Know?
Sodium metabisulfite is extensively used in makeup and skincare products.
Sodium metabisulfite has antioxidant properties, so it is added to skin care products to increase their shelf life.
Sodium metabisulfite is safer to use on the skin. Because of its disinfectant properties, it is used in sanitizers.
Sanitizers are in high demand nowadays because of the Corona pandemic.
So, the usage of sodium metabisulfite is also increased.
1. Antioxidant - Reduces oxidation to prevent the formation of free radicals which may be harmful to health.
2. Preservative - Prevents and inhibits the growth of unwanted microorganisms which may be harmful
Sodium metabisulphite is used as a preservative and antioxidant in food and is also known as E223.
Sodium metabisulfite may cause allergic reactions in those who are sensitive to sulfites, including respiratory reactions in asthmatics, anaphylaxis, and other allergic reactions in sensitive individuals.
Sodium metabisulfite and potassium metabisulfite are the primary ingredients in Campden tablets, used for wine and beer making.
Sodium metabisulfite is approved to use as food additive in EU. In US, it is generally recognized as safe food substance.
Synonyms :
Sodium metabisulfite
7681-57-4
Sodium pyrosulfite
Sodium disulfite
Disodium disulphite
Disodium pyrosulfite
Sodium metabisulphite
Disodium disulfite
Disodium metabisulfite
Sodium bisulfite anhydrous
UNII-4VON5FNS3C
sodium pyrosulphite
MFCD00167602
4VON5FNS3C
Na2S2O5
Sodium metabisulfite [NF]
Disulfurous acid, sodium salt (1:2)
Fertisilo
Natrii disulfis
Campden Tablets
Sodium metabisulfite (NF)
Natrium pyrosulfit
Natriummetabisulfit
Natrium metabisulfurosum
CCRIS 3951
HSDB 378
Sodium pyrosulfite (Na2S2O5)
Sodium metabisulfite (Na2-S2O5)
EINECS 231-673-0
AI3-51684
Disodiumdisulphite
Sodium metasulfite
sodiummetabisulphite
sodium metabisuifite
sodium metabisuiphite
sodium meta bisulfite
