·
CAS Number 16731-55-8
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Linear Formula K2S2O5
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Molecular Weight 222.32
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EC Number 240-795-3
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MDL number MFCD00167605
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PubChem Substance ID 329820140
Potassium metabisulfite, K2S2O5, also
known as potassium pyrosulfite,
is a white crystalline powder with a
pungent sulfur odour. The main
use for the chemical is as an antioxidant or chemical
sterilant. It is
a disulfite and is chemically very similar to sodium
metabisulfite, with which it is sometimes used interchangeably. Potassium
metabisulfite is generally preferred out of the two as it does not contribute sodium to the diet.
Detailed description
Potassium metabisulfite has a monoclinic crystal structure
which decomposes at 190 °C, yielding potassium sulfite and sulfur dioxide:
K2S2O5(s)
→ K2SO3(s) + SO2(g)
Uses
It is used as a food additive, also known as E224.[1] It is restricted in
use and may cause allergic reactions in some sensitive persons.[2]
Potassium is an inhibitor of the polyphenol
oxidase enzyme.[3]
Wine
Potassium metabisulfite is a common wine or must additive, in which
it forms sulfur dioxide gas (SO2). This both prevents most wild microorganisms from growing, and it
acts as a potent antioxidant, protecting both the color and delicate flavors of wine.
The typical dosage is 1/4 tsp (1.23 milliliters)
potassium metabisulfite per six-gallon bucket of must (yielding roughly 75 ppm
of SO2) prior to fermentation; then 1/2 tsp per six-gallon bucket
(150 ppm of SO2) at bottling. Most commercial wineries do not add
more than 30ppm at bottling.
Winemaking equipment is sanitized by spraying with a
1% SO2 (2 tsp
potassium metabisulfite per L) solution.
Beer
Potassium metabisulfite is sometimes used in the brewing industry to inhibit
the growth of wild bacteria and fungi. This is called 'stabilizing'. It is also used to neutralize chloramine that has been added to tap water at
the source as a disinfectant. It is used both by homebrewers and commercial brewers alike. It is
not used as much for brewing beer, because the wort is almost always boiled, which kills
most microorganisms. It can also be added to strike water (the water used to
mash the malted barley) in order to remove chloramines which can cause phenolic
off flavors in beer.
Other uses
·
Potassium metabisulfite
is sometimes added to lemon juice as a preservative.
·
Potassium metabisulfite
is used in the textile industry for dyeing and cotton printing.
·
Potassium metabisulfite
is sometimes used to precipitate gold from solution in aqua
regia (as an alternative to sodium
sulfite).
·
It is a component of
certain photographic developers and solutions used in photographic fixing.
·
It is used as a
bleaching agent in the production of Coconut cream
·
It is used in some
pickles as a preservative
PRICE
$123.24/KG OR $56.01/IB
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