If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
S4672
Sodium sulfite
BioXtra, ≥98%
Synonym(s):
Natrium sulfite, Sodium sulphite
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Product Name
Sodium sulfite, BioXtra, ≥98%
InChI key
GEHJYWRUCIMESM-UHFFFAOYSA-L
InChI
1S/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2
SMILES string
[Na+].[Na+].[O-]S([O-])=O
product line
BioXtra
assay
≥98%
form
powder or crystals
impurities
≤0.005% Insoluble matter
≤5 ppm Phosphorus (P)
solubility
H2O: 1 M at 20 °C, clear, colorless
anion traces
chloride (Cl-): ≤0.02%
cation traces
Al: ≤5 ppm
Ca: ≤0.01%
Cu: ≤5 ppm
Fe: ≤5 ppm
K: ≤0.05%
Mg: ≤0.005%
NH4+: ≤0.05%
Pb: ≤10 ppm
Zn: ≤5 ppm
Quality Level
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This Item | 71988 | 71988 | S0505 |
|---|---|---|---|
| form powder or crystals | form powder | form powder | form powder or crystals |
| assay ≥98% | assay ≥98% (RT) | assay ≥98% (RT) | assay ≥98% |
| solubility H2O: 1 M at 20 °C, clear, colorless | solubility H2O: 1 M at 20 °C, clear, colorless | solubility H2O: 1 M at 20 °C, clear, colorless | solubility - |
| Quality Level 200 | Quality Level 200 | Quality Level 200 | Quality Level 100 |
| anion traces chloride (Cl-): ≤0.02% | anion traces chloride (Cl-): ≤50 mg/kg, thiosulfate (S2O32-): ≤200 mg/kg | anion traces chloride (Cl-): ≤50 mg/kg, thiosulfate (S2O32-): ≤200 mg/kg | anion traces - |
| impurities ≤0.005% Insoluble matter, ≤5 ppm Phosphorus (P) | impurities insoluble matter, passes filter test | impurities insoluble matter, passes filter test | impurities - |
| form powder or crystals | form powder | form powder | form powder or crystals |
| assay ≥98% | assay ≥98% (RT) | assay ≥98% (RT) | assay ≥98% |
| solubility H2O: 1 M at 20 °C, clear, colorless | solubility H2O: 1 M at 20 °C, clear, colorless | solubility H2O: 1 M at 20 °C, clear, colorless | solubility - |
| Quality Level 200 | Quality Level 200 | Quality Level 200 | Quality Level 100 |
| anion traces chloride (Cl-): ≤0.02% | anion traces chloride (Cl-): ≤50 mg/kg, thiosulfate (S2O32-): ≤200 mg/kg | anion traces chloride (Cl-): ≤50 mg/kg, thiosulfate (S2O32-): ≤200 mg/kg | anion traces - |
| impurities ≤0.005% Insoluble matter, ≤5 ppm Phosphorus (P) | impurities insoluble matter, passes filter test | impurities insoluble matter, passes filter test | impurities - |
Application
- A Soy Protein-Based Film Based on Chemical Treatment and Microcrystalline Cellulose Reinforcement Obtained from Corn Husk Byproducts.: This research explores the development of a soy protein-based film reinforced with microcrystalline cellulose derived from corn husk byproducts, treated chemically with sodium sulfite. The resulting film exhibited enhanced mechanical properties, making it a viable option for biodegradable packaging (Zhang et al., 2024) (Zhang et al., 2024).
- Modelling Energy-Harvesting Processes in Primitive Cells: Proton Transport Across Bilayers Driven by the Oxidation of Sulfite.: This article models the energy-harvesting processes in primitive cells, focusing on proton transport across bilayers driven by sulfite oxidation. The findings contribute to the understanding of early cellular bioenergetics and the role of sulfite in these processes (Paula et al., 2024) (Paula et al., 2024).
Storage Class
13 - Non Combustible Solids
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
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Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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