Budesonide EP Impurity K (Mixture of Epimer) CAS 51333-05-2
| CAS No. | 51333-05-2 |
| Molecular Formula | C27H36O7 |
| Molecular Weight | 472.57 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Budesonide EP Impurity K (Mixture of Epimer) (CAS 51333-05-2), a pharmacopoeial impurity reference standard (molecular formula C27H36O7, MW 472.57 g/mol) used for the identification and quantification of trace impurities in APIs.
Budesonide EP Impurity K (Mixture of Epimer) (C27H36O7) contains a carboxylic acid group, a hydroxyl group, an ether linkage, a polycyclic aromatic system. The carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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).
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.
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 | C27H36O7 |
| Molecular Weight | 472.57 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >95% |
| Storage | Store at room temperature, 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 |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1971 |
Related Budesonide Standards
- Budesonide impurity 46 (CAS 1831164-04-5)
- Budesonide Impurity 61 (CAS 131711-17-6)
- Budesonide Impurity 38 (CAS CATO-C4X-138938)
- Budesonide Impurity 78 (CAS CATO-C4X-138978)
- Budesonide Impurity 66 (CAS CATO-C4X-138966)
- Budesonide Impurity 67 (CAS CATO-C4X-138967)
- Budesonide impurity 43 (CAS CATO-C4X-138943)
- Budesonide Impurity 51 (CAS CATO-C4X-138951)
Recommended Standards
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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