Norfloxacin Impurity 23 CAS CATO-C4X-146823
| CAS No. | CATO-C4X-146823 |
| Molecular Formula | C16H18ClFN3O4 |
| Molecular Weight | N/A |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
CATO supplies Norfloxacin Impurity 23 (CAS CATO-C4X-146823), a pharmacopoeial impurity reference standard (molecular formula C16H18ClFN3O4HCl, MW 407.24 g/mol) used for the identification and quantification of trace impurities in APIs.
The molecular framework of Norfloxacin Impurity 23 (C16H18ClFN3O4HCl) is characterized by a flavonoid core, an amide group, a hydroxyl group, an ether linkage, fluorine/chlorine substitution. 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).
As a certified reference material (CRM), Norfloxacin Impurity 23 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 | C16H18ClFN3O4 HCl |
| Molecular Weight | 407.24 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 7.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | F/Cl-containing |
| Nitrogen Atoms | 3 |
Related Norfloxacin Standards
- Norfloxacin-D5 (CAS 1015856-57-1)
- Norfloxacin Impurity 21 (CAS 103240-27-3)
- Norfloxacin Hydrochloride (CAS 104142-93-0)
- Norfloxacin EP Impurity H (CAS 105440-01-5)
- Norfloxacin Impurity C70 (CAS 106847-38-5)
- Norfloxacin Impurity C171 (CAS 106847-39-6)
- Norfloxacin Impurity 63 (CAS 106847-42-1)
- Norfloxacin Impurity 22 (CAS 109142-49-6)
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