Fluorescein EP Impurity C CAS 2513-33-9
| CAS No. | 2513-33-9 |
| Molecular Formula | C14H10O5 |
| Molecular Weight | 258.23 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a process- or degradation-related impurity, Fluorescein EP Impurity C (CAS 2513-33-9, C14H10O5) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Based on its molecular formula C14H10O5, Fluorescein EP Impurity C contains a carboxylic acid group, a hydroxyl group, an ether linkage, a polycyclic aromatic system; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 258.23 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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 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), Fluorescein EP Impurity C 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 | C14H10O5 |
| Molecular Weight | 258.23 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >95% |
| 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; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
Related Fluorescein Standards
- Fluorescein Impurity 2 (3,6-Dichlorotrimellitic Anhydride) (CAS 81742-10-1)
- Fluorescein Impurity 15 (CAS 869811-23-4)
- Fluorescein Impurity 4 (CAS 2318-08-3)
- Fluorescein Impurity 6 (CAS 2321-08-6)
- Fluorescein (CAS 2321-07-5)
- Fluorescein Impurity 7 (CAS CATO-C4X-29007)
- Fluorescein Methyl ester (CAS 70672-06-9)
- Fluorescein Impurity 3 (CAS 1428447-91-9)
Recommended Standards
- Carbasalate EP Impurity D (CAS 552-94-3)
- Propofol Impurity 30 (CAS 2215-89-6)
- Azacitidine Impurity 5 (CAS 105330-94-7)
- Propofol Impurity 42 (CAS 40677-31-4)
- Bupropion Impurity 03 (CAS 2763780-10-3)
- Lusutrombopag Impurity 38 (CAS CATO-C4X-208438)
- Ixazomib Impurity 59 (CAS CATO-C4X-126759)
- 3,4-Dimethylphenyl 1,2,3,4-tetrahydroacridine-9-carboxylate (CAS 853317-79-0)
- tert-Butyl (2-hydroxycyclohexyl)carbamate (CAS 477584-30-8)
- 2-Ethoxy-3-methylbutanenitrile (CAS 1479205-96-3)
- 2-Chloro-N-isobutylpyridin-3-amine (CAS 54173-23-8)
- Cesium chromate (CAS 56320-90-2)
- Bis(trimethylsilyl)maleate (CAS 18457-04-0)
- Allo-D-Ile27-Tirzepatide (CAS CATO-CPTD788961)
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