Sodium sulfite

SIGMA/71988 - BioUltra, anhydrous, ≥98% (RT)

Synonym: Natrium sulfite

CAS Number: 7757-83-7
Empirical Formula (Hill Notation): Na₂O₃S
Molecular Weight: 126.04
EC Number: 231-821-4
MDL Number: MFCD00003503
Linear Formula: Na₂SO₃
Product Type: Chemical

Catalog Number	PKG Qty.	Price


45-71988-250G	250 g	$92.20 1/EA	Add To Favorites
45-71988-1KG	1 kg	$303.00 1/EA	Add To Favorites

Properties
Descriptions
Safety Info.
Basic Data

absorption	cut-off at 265 nm in H₂O at 1 M
anion traces	chloride (Cl^-): ≤50 mg/kg
	thiosulfate (S₂O₃^2-): ≤200 mg/kg
assay	≥98% (RT)
cation traces	Al: ≤5 mg/kg
	As: ≤0.1 mg/kg
	Ba: ≤5 mg/kg
	Bi: ≤5 mg/kg
	Ca: ≤10 mg/kg
	Cd: ≤5 mg/kg
	Co: ≤5 mg/kg
	Cr: ≤5 mg/kg
	Cu: ≤5 mg/kg
	Fe: ≤5 mg/kg
	K: ≤200 mg/kg
	Li: ≤5 mg/kg
	Mg: ≤5 mg/kg
	Mn: ≤5 mg/kg
	Mo: ≤5 mg/kg
	Ni: ≤5 mg/kg
	Pb: ≤5 mg/kg
	Sr: ≤5 mg/kg
	Zn: ≤5 mg/kg
form	powder
grade	reagent grade
impurities	insoluble matter, passes filter test
InChI	1S/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2
InChI key	GEHJYWRUCIMESM-UHFFFAOYSA-L
loss	≤0.1% loss on drying, 20 °C (HV)
pH	9.0-10.5 (25 °C, 1 M in H₂O)
product line	BioUltra
Quality Level	200
SMILES string	[Na+].[Na+].[O-]S([O-])=O
solubility	H₂O: 1 M at 20 °C, clear, colorless

Application:

Tuning Structural Characteristics of Corn Stover Through Ammonium and Sodium Sulfite (ASS) Pretreatment for Enhanced Enzymatic Hydrolysis.: This study demonstrates the effective use of sodium sulfite in pretreating biomass to enhance its enzymatic breakdown, crucial for improving biofuel production efficiency (Chen X et al., 2024 ).

A Soy Protein-Based Film Based on Chemical Treatment and Microcrystalline Cellulose Reinforcement Obtained from Corn Husk Byproducts.: Highlights the application of sodium sulfite in the development of biodegradable films, showcasing its potential in creating sustainable materials in the food packaging industry (Zhang B et al., 2024 ).

Sodium Sulfite as a Novel Hypoxia Revulsant Involved in Hypoxic Regulation in Escherichia coli.: Investigates sodium sulfite′s role as a hypoxia revulsant, providing insights into its biochemical applications for managing bacterial growth under low oxygen conditions, relevant for biomedical research and microbial management (Ye Q et al., 2024 ).

Modelling energy-harvesting processes in primitive cells: Proton transport across bilayers driven by the oxidation of sulfite.: Explores the potential of sodium sulfite in facilitating proton transport across biological membranes, which is crucial for understanding cellular energy mechanisms and could lead to advancements in bioenergy and synthetic biology (Paula S et al., 2024 ).

Other Notes:

Cleaves disulfide bonds to form the S-sulfonate derivative; Inhibits gram positive bacteria in culture media;

Risk Statements	31
RIDADR	NONH for all modes of transport
WGK Germany	WGK 1
Flash Point(F)	Not applicable
Flash Point(C)	Not applicable
Supplemental Hazard Statements	EUH031

Purity	≥98% (RT)
UNSPSC	12352302

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