Sitafloxacin Impurity 37 CAS CATO-C4X-115537
| CAS No. | CATO-C4X-115537 |
| Molecular Formula | C16H14FO5P |
| Molecular Weight | 336.25 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
As a process- or degradation-related impurity, Sitafloxacin Impurity 37 (CAS CATO-C4X-115537, C16H14FO5P) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
The molecular framework of Sitafloxacin Impurity 37 (C16H14FO5P) is characterized by a flavonoid core, a phosphate ester group, a hydroxyl group, an ether linkage, fluorine substitution. In reversed-phase chromatography, its retention is governed primarily by the polarity and ionization state of its functional groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C16H14FO5P |
| Molecular Weight | 336.25 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 methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 9.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | F-containing |
Related Sitafloxacin Standards
- Sitafloxacin impurity 74 (CAS CATO-C4X-115574)
- Sitafloxacin impurity 59 (CAS 1542764-78-2)
- Sitafloxacin Impurity N13 (CAS 127199-25-1)
- Sitafloxacin Impurity N14 (CAS 127199-27-3)
- Sitafloxacin Impurity 34 (CAS 2365490-44-2)
- Sitafloxacin Impurity 35 (CAS CATO-C4X-115535)
- Sitafloxacin impurity 56 (CAS CATO-C4X-115556)
- Sitafloxacin impurity 55 (CAS CATO-C4X-115555)
Recommended Standards
- tert-butyl trans-3-(2,6-dichloropyridine-4-carbonyl)cyclobutanecarboxylate (CAS 2708283-76-3)
- Opicapone Impurity 48 (CAS CATO-C4X-240448)
- tert-butyl cis-3-(2,6-dichloropyridine-4-carbonyl)cyclobutanecarboxylate (CAS 2703696-90-4)
- 4-{3-[4-(Trifluoromethoxy)phenyl]-prop-2-enoyl}benzoic acid (CAS 1217254-43-7)
- Famotidine Impurity 78 (CAS 88068-99-9)
- Entacapone Impurity 56 (CAS CATO-C4X-162956)
- Methisosildenafil Impurity 7 (CAS 6290-24-0)
- 17β-Hydroxy-17α-methylandrost-4-eno[3,2-c]pyrazole (CAS 5697-57-4)
- 1-n-Octyl-2-phenylbenzmidazole (CAS 305347-15-3)
- ethyl 4-(trifluoromethyl)thiazole-5-carboxylate (CAS 106203-24-1)
- 4-Bromo-1,3-butanediol (CAS 31100-40-0)
- 3'-Amino-biphenyl-4-carbaldehyde (CAS 1093758-72-5)
- N-((1-Ethyl-5-fluoro-1H-pyrazol-4-yl)methyl)-1,4-dimethyl-1H-pyrazol-3-amine hydrochloride (CAS 1856094-69-3)
- Semaglutide impurity 203 (CAS CATO-C4X-2226203)
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