Cefmetazole sodium Impurity 20 CAS 70953-18-3
| CAS No. | 70953-18-3 |
| Molecular Formula | C13H15N3O5S2 |
| Molecular Weight | 357.41 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Cefmetazole sodium Impurity 20 (CAS 70953-18-3) is a high-purity analytical reference standard with the molecular formula C13H15N3O5S2 and a molecular weight of 357.41 g/mol.
The molecular framework of Cefmetazole sodium Impurity 20 (C13H15N3O5S2) is characterized by a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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 is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C13H15N3O5S2 |
| Molecular Weight | 357.41 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1977 |
| Nitrogen Atoms | 3 |
| Sulfur Atoms | 2 |
Related Cefmetazole Standards
- Cefmetazole Impurity 25 (CAS CATO-C4X-150725)
- Cefmetazole Impurity 3 (CAS 70993-70-3)
- Cefmetazole sodium Impurity 25 (CAS 73707-53-6)
- Cefmetazole sodium Impurity 12 (CAS 70953-19-4)
- Cefmetazole Impurity 21 (CAS CATO-C4X-150721)
- Cefmetazole Impurity 17 (CAS CATO-C4X-150717)
- Cefmetazole Impurity 57 (CAS CATO-C4X-150757)
- Cefmetazole Impurity 45 (CAS CATO-C4X-150745)
Recommended Standards
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- (1R,2S)-2-(methoxycarbonyl)cyclopropane-1-carboxylic acid (CAS 88335-86-8)
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