Ciprofloxacin Impurity 21 CAS 93594-39-9
| CAS No. | 93594-39-9 |
| Molecular Formula | C18H18FN3O4 |
| Molecular Weight | 359.35 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 359.35 g/mol gives Ciprofloxacin Impurity 21 distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
As a process- or degradation-related impurity, Ciprofloxacin Impurity 21 (CAS 93594-39-9, C18H18FN3O4) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Ciprofloxacin Impurity 21 (C18H18FN3O4) contains a flavonoid core, an amide group, a hydroxyl group, an ether linkage, fluorine substitution. It is notably hygroscopic, halogen substitution raises its density and boiling point, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
CATO manufactures Ciprofloxacin Impurity 21 under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C18H18FN3O4 |
| Molecular Weight | 359.35 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1983 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 3 |
Related Ciprofloxacin Standards
- Ciprofloxacin Ethyl Ester (CAS 105404-65-7)
- Ciprofloxacin EP Impurity D (CAS 133210-96-5)
- Ciprofloxacin impurity 45 (CAS 93106-58-2)
- Ciprofloxacin Impurity 41 (CAS CATO-C4X-136241)
- Ciprofloxacin impurity 51 (CAS CATO-C4X-136251)
- Ciprofloxacin Impurity 15 (CAS 86483-53-6)
- Ciprofloxacin Impurity 26 (CAS 107884-23-1)
- Ciprofloxacin Impurity 14 (CAS 103237-52-1)
Recommended Standards
- Cefuroxime Impurity 63 (CAS CATO-C4X-124563)
- Cefuroxime Axetil Impurity 6 (CAS CATO-C4X-14366)
- Capecitabine EP Impurity E (CAS 162204-30-0)
- Lemborexant Impurity 60 (CAS CATO-C4X-304260)
- Tofacitinib Impurity 27 (CAS 2028267-73-2)
- Luliconazole impurity 29 (CAS CATO-C4X-285329)
- 【禁售不询】Levetiracetam Impurity 17 (CAS 96-48-0)
- Ursodeoxycholic Acid impurity 104 (CAS CATO-C4X-1422104)
- Tebuthiuron-N-desmethyl (CAS 24814-29-7)
- 2-(Difluoromethyl)naphthalene-1-methanol (CAS 1261728-21-5)
- 2-((3AR)-1-acetyl-3a-methyl-5-oxooctahydropyrrolo[2,3-b]pyrrol-2-yl)phenyl 5-methylisoxazole-3-carboxylate (CAS 956943-46-7)
- 4,4'-(Furan-2,5-diyl)bis(N-cyclopropylbenzimidamide) (CAS 173420-67-2)
- 2-(Cyclopropylamino)-N-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)ethane-1-sulfonamide (CAS 756520-93-1)
- Amyloid Precursor Frameshift Mutant C-Terminal Peptide trifluoroacetate salt (CAS 189125-14-2)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com