rac-Carbidopa EP Impurity C CAS 85933-19-3
| CAS No. | 85933-19-3 |
| Molecular Formula | C11H16N2O4 |
| Molecular Weight | 240.26 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a process- or degradation-related impurity, rac-Carbidopa EP Impurity C (CAS 85933-19-3, C11H16N2O4) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Based on its molecular formula C11H16N2O4, rac-Carbidopa EP Impurity C 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 240.26 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.
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 | C11H16N2O4 |
| Molecular Weight | 240.26 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1981 |
| Nitrogen Atoms | 2 |
Related rac Standards
- Carbidopa Impurity 11 (CAS CATO-C4X-231011)
- Carbidopa Impurity 29 (CAS CATO-C4X-231029)
- Carbidopa EP Impurity C (CAS 84488-77-7)
- Carbidopa impurity 38 (CAS 2470439-16-6)
- Carbidopa EP Impurity E (CAS 52514-63-3)
- Carbidopa EP Impurity H (CAS 1361017-74-4)
- Carbidopa impurity 39 (CAS 2354546-08-8)
- Carbidopa impurity 40 (CAS CATO-C4X-231040)
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