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E227 Calcium hydrogen sulphite is an inorganic compound which is the salt of a calcium cation and a bisulfite anion.
E227 Calcium hydrogen sulphite may be prepared by treating lime with an excess of sulfur dioxide and water.
As a food additive E227 Calcium hydrogen sulphite is used as a preservative under the E number E227.
CAS: 13780-03-5
MF: CaH4O3S
MW: 124.17
EINECS: 237-423-7
Synonyms
calcium hydrogensulphite;CALCIUMMETABISULPHITE;CALCIUMBISULPHITE;Calcium hydrogensulfite;Calcium bisulfite;Bis(sulfinooxy)calcium;CALCIUMBISULFITE(SOLUTION)
E227 Calcium hydrogen sulphite is an acid salt and behaves like an acid in aqueous solution.
E227 Calcium hydrogen sulphite is used in the sulfite process for producing paper from wood chips.
Now more commonly known as calcium hydrogensulfite, Ca(HS03)2 is a compound known only in solution.
The colorless aqueous solution smells like sulfur dioxide and is made by dissolving E227 Calcium hydrogen sulphite in aqueous S02 solution, or by passing S02 through calcium hydroxide suspensions.
Used in large amounts to make cellulose by the sulfite process, E227 Calcium hydrogen sulphite is also used to disinfect barns, as an antiseptic in medicine, and as a preservative.
E227 Calcium hydrogen sulphite is the other name for this salt of a calcium cation and a bisulfite anion.
Chemical formula is: Ca(HSO3)2.
This sulfite was patented to use in wood pulp industry in the US in 1867.
Not permitted as a preservative in Australia and New Zealand, but still used in other parts of the world.
Prevents secondary fermentation in brewing and is used in washing beer casks to prevent the beer becoming cloudy or sour.
Also used as a firming agent in canned fruits and vegetables.
E227 Calcium hydrogen sulphite, solution appears as a colorless to yellow aqueous solution with an odor of sulfur dioxide.
Corrosive to metals.
E227 Calcium hydrogen sulphite is a bisulfite salt of Calcium with the chemical formula Ca(HSO3)2.
E227 Calcium hydrogen sulphite is used as a preservative when used as a food additive, and its E code is e227.
E227 Calcium hydrogen sulphite Chemical Properties
density: about 1.06
solubility: soluble in H2O
LogP: -1.591 (est)
EPA Substance Registry System: E227 Calcium hydrogen sulphite (13780-03-5)
Uses
As germicide, preservative, and disinfectant; for washing (1:1000) casks in brewing to prevent souring and cloudiness of beer and to prevent secondary fermentation; as antichlor in bleaching fabrics; largely in manufacture of sulfite cellulose from wood for paper-making.
E227 Calcium hydrogen sulphite is an inorganic compound that consists of calcium cations and bisulfite anions.
E227 Calcium hydrogen sulphite is possible to prepare sulfur dioxide and water by treating lime with excess lime.
As a food additive E227 Calcium hydrogen sulphite is used as a preservative in the following E number e227.
E227 Calcium hydrogen sulphite is a sulfate that behaves like an acid in aqueous solution.
E227 Calcium hydrogen sulphite is used in the sulfite process for the production of paper from wood chips.
Economical
E227 Calcium hydrogen sulphite is one of the chemicals used in an overall mild bisulfite treatment meant to increase the sugar yield efficiency in processing timber excess to biofuel and jet fuel.
The use of the Mild Bisulfite methodology both increases the yield and also saves cost in shipping wood to ethanol plants for processing.
E227 Calcium hydrogen sulphite is often used as a food preservative. One such case is to brine cherries.
However, research is showing that some microorganisms can cause cherries to rot since they produce the enzyme polygalacturonase that can work even in the presence of calcium bisulfite.
Three species of fungi that are especially capable of rotting brined cherries are Aspergillus niger, Cytospora leucostoma, and Penicillium expansum.
Medicinal
An E227 Calcium hydrogen sulphite liquor solution is used in the process of converting dihydroquercetin in tree bark pulp and then converting dihydroquercetin to a usable form: quercetin.
E227 Calcium hydrogen sulphite is not the optimum bisulfite compound for this reaction since the calcium ions can be removed from the calcium bisulfite solution during the reaction, thereby inhibiting the mechanism.
However, E227 Calcium hydrogen sulphite, like other bisuflites such as ammonium bisulfite, have a catalytic capacity in this reaction since they are not used up and can be reused.
Synthesis
E227 Calcium hydrogen sulphite can be prepared by treating lime (chemical formula Ca(OH)2) with an excess of sulfur dioxide and water.
Upon synthesis of E227 Calcium hydrogen sulphite solution, it will have a green to yellow opaque appearance as an aqueous solution.
Chemical reactions
When E227 Calcium hydrogen sulphite reacts with the surrounding air, a crystalline precipitate will form composed of calcium sulfate dihydrate.
When E227 Calcium hydrogen sulphite is digested as a food additive, different reactions in metabolic pathways can result.
One common pathway results in a reaction that will yield 6%-8% sulfur dioxide.
This can go to sulfite when absorbed by the lungs, and the sulfite will be converted to sulfate in the liver by an enzyme called sulfite oxidase.
E227 Calcium hydrogen sulphite can be harmful for people susceptible to asthma, leading to asthma attacks.
E227 Calcium hydrogen sulphite can also cause urticaria and angioedema in otherwise healthy individuals.
A process known as wet limestone scrubbing is a means by which sulfur dioxide is removed from the waste emitted during the combustion of fossil fuels.
A step in this process is the oxidation of calcium bisulfite to produce sulfate.
When this reaction occurs in an aqueous solution, gypsum results.
The rate of this reaction can be increased in the presence of magnesium(II) sulfate as a catalyst.
Other catalysts for the oxidation of E227 Calcium hydrogen sulphite include manganese, iron, cobalt, nickel, lead, and zinc.
