Cefoxitin Impurity 43 CAS 40514-91-8
| CAS No. | 40514-91-8 |
| Molecular Formula | C13H20N2O4S |
| Molecular Weight | 300.37 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), Cefoxitin Impurity 43 meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
CATO supplies Cefoxitin Impurity 43 (CAS 40514-91-8), a pharmacopoeial impurity reference standard (molecular formula C13H20N2O4S, MW 300.37 g/mol) used for the identification and quantification of trace impurities in APIs.
Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage, Cefoxitin Impurity 43 is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 300.37 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.
Physical & Chemical Properties
| Molecular Formula | C13H20N2O4S |
| Molecular Weight | 300.37 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1968 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Cefoxitin Standards
- Cefoxitin Impurity 33 (CAS CATO-C4X-157833)
- Cefoxitin EP Impurity C（Cefalotin EP Impurity D） (CAS 10590-10-0)
- Cefoxitin Impurity 44 (CAS CATO-C4X-157844)
- Cefoxitin EP Impurity J (CAS 1422023-33-3)
- Cefoxitin Impurity 12 (CAS 40514-94-1)
- Cefoxitin Impurity 27 (CAS CATO-C4X-157827)
- Cefoxitin Impurity 28 (CAS CATO-C4X-157828)
- Cefoxitin Impurity 34 (CAS CATO-C4X-157834)
Recommended Standards
- Ampicillin EP Impurity J (CAS 6489-58-3)
- Teneligliptin Impurity 3 (CAS 401564-36-1)
- 68499-39-8 Benzenesulfonamide, N-((butylamino)carbonyl)-4-methoxy-2-methyl- 4-11-00-00606 (Beilstein Handbook Reference) BRN 2664535 N-((Butylamino)carbonyl)-4-methoxy-2-methylbenzenesulfonamide (CAS 68499-39-8)
- Teneligliptin Impurity 5 (CAS 1415908-67-6)
- N-Nitroso Cefoperazone 1 (CAS CATO-C4X-114952)
- Levocarnitine Impurity N27 (CAS 6790-41-6)
- Lamivudine EP Impurity G (CAS 160552-55-6)
- 4-(1-Methylindolin-5-yl)but-3-en-2-one (CAS 1344842-27-8)
- (R)-2-([1,1'-Biphenyl]-4-yl)-2-aminoacetic acid (CAS 1228559-61-2)
- N-(6-(3-chlorophenyl)-2,5-dioxo-5,6-dihydro-2H-pyrano[3,2-c]pyridin-3-yl)-3-(trifluoromethyl)benzamide (CAS 341966-31-2)
- 6-Chloro-2',3',5',6'-tetrahydrospiro[indoline-3,4'-pyran] hydrochloride (CAS 2197062-03-4)
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- (4-Methoxypyridin-3-yl)methanamine dihydrochloride (CAS 1214729-75-5)
- (Tyr?)-C-Peptide (dog) (CAS 101135-67-5)
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