Cefradine lmpurity 21 CAS 20763-30-8
| CAS No. | 20763-30-8 |
| Molecular Formula | C8H11NO2 |
| Molecular Weight | 153.18 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of Cefradine lmpurity 21 is closely related to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
As a process- or degradation-related impurity, Cefradine lmpurity 21 (CAS 20763-30-8, C8H11NO2) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Based on its molecular formula C8H11NO2, Cefradine lmpurity 21 contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 153.18 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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.
As a certified reference material (CRM), Cefradine lmpurity 21 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.
Physical & Chemical Properties
| Molecular Formula | C8H11NO2 |
| Molecular Weight | 153.18 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1962 |
| Nitrogen Atoms | 1 |
Related Cefradine Standards
- Cefradine EP Impurity B (CAS 26774-88-9)
- ent-Cefradine EP Impurity B (CAS 26108-29-2)
- Cefradine Impurity 25 (CAS CATO-C4X-121525)
- Cefradine Impurity 5 (CAS 1379292-16-6)
- Cefradine Impurity 28 (CAS 220275-58-1)
- Cefradine EP Impurity A/Cefadroxil EP Impurity B (CAS 22252-43-3)
- Cefradine Impurity 17 (CAS CATO-C4X-121517)
- Cefradine EP Impurity G(Cefalexin EP Impurity E/Cefadroxil EP Impurity H) (CAS 146794-70-9)
Recommended Standards
- Ilaprazole Impurity 40 (CAS 102625-96-7)
- Tirofiban Impurity 110 (CAS 69603-65-2)
- Ilaprazole impurity 204 (CAS 1379034-97-5)
- Omeprazole Impurity 30 (CAS 727375-13-5)
- Finerenone Impurity 226 (CAS CATO-C4X-2880226)
- Afatinib Impurity 84 (CAS CATO-C4X-100684)
- Vildagliptin Impurity 8 (CAS 204387-53-1)
- C8813 (CAS 616898-54-5)
- Selexipag Impurity 66 (CAS CATO-C4X-196166)
- 4-Methyl-2-propoxyaniline hydrochloride 640767-75-5 7269AE C10H15NO (CAS 640767-75-5)
- 4-(3-Fluoro-4-methylphenyl)phenol (CAS 1262001-75-1)
- 83058-69-9 Tfc 612 Hexanoic acid, 6-((3-hydroxy-2-(3-hydroxy-5-methyl-1-nonenyl)-5-oxocyclopentyl)thio)-, methyl ester, (1R-(1alpha,2beta(1E,3S*,5R*),3alpha))- Methyl 6-((-3-hydroxy-2-(3-hydroxy-5-methyl-1-nonenyl)-5-oxocyclopentyl)thio)hexanoate Tei 6122 Tfc-612 (CAS 83058-69-9)
- N-(1-Naphthalenesulfonyl)-L-phenylalanine (CAS 90291-46-6)
- FLAG Epitope Peptide (CAS 98849-88-8)
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