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P2522

Sigma-Aldrich

Potassium disulfite

≥98%

Synonym(s):

Potassium metabisulfite, Potassium pyrosulfite

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About This Item

Linear Formula:
K2S2O5
CAS Number:
16731-55-8
Molecular Weight:
222.32
EC Number:
240-795-3
MDL number:
MFCD00167605
UNSPSC Code:
12352300
PubChem Substance ID:
329820140
NACRES:
NA.55

Quality Level

200

assay

≥98%

form

powder

SMILES string

[K+].[K+].[O-]S(=O)S([O-])(=O)=O

InChI

1S/2K.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2

InChI key

RWPGFSMJFRPDDP-UHFFFAOYSA-L

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General description

Potassium disulfite (Potassium metabisulfite, PMB) is an inorganic salt with antimicrobial properties. It is a sulfiting agent that prevents browning of foods. Its genotoxic and cytotoxic effect has been assessed. PMB undergoes hydrolysis to form potassium bisulfite.

Application

Potassium disulfite has been used in a protocol for the modification of the polydimethylsiloxane (PDMS) polymer surfaces.
It may be used in the following processes:
  • Chemical etching of poly(vinylidene fluoride) in β-phase (β-PVDF) irradiated films.
  • Decolorization during the synthesis of 2-iodopyrimidine derivatives.
  • Palladium-catalyzed aminosulfonylation of aryl halides.

pictograms

CorrosionExclamation mark
GHS05,GHS07

signalword

Danger

Hazard Classifications

Eye Dam. 1 - STOT SE 3

target_organs

Respiratory system

supp_hazards

EUH031

Storage Class

11 - Combustible Solids

wgk_germany

WGK 1

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Nanoporous β-PVDF membranes with selectively functionalized pores.
Cuscito O, et al.
Nucl. Instrum. Methods Phys. Res. Sect. B, 265(1), 309-313 (2007)
A palladium-catalyzed reaction of aryl halides, potassium metabisulfite, and hydrazines.
Ye S and Wu J.
Chemical Communications (Cambridge, England), 48(80), 10037-10039 (2012)
Biofunctionalization and self-interaction chromatography in PDMS microchannels.
Deshpande KS, et al.
Biochemical Engineering Journal, 67, 111-119 (2012)
Amperometric quantification of sodium metabisulfite in pharmaceutical formulations utilizing tetraruthenated porphyrin film modified electrodes and batch injection analysis.
Quintino MSM, et al.
Talanta, 68(4), 1281-1286 (2006)
Gábor Vlád et al.
The Journal of organic chemistry, 67(18), 6550-6552 (2002-08-31)
A high-yield synthesis was developed for the preparation of 2,2'-bipyrimidine (1) using the Ullmann coupling of 2-iodopyrimidine. The new procedure was also used for the preparation of 4,4',6,6'-tetramethyl-2,2'-bipyrimidine (2) and 5,5'-dibromo-2,2'-bipyrimidine (3).
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