Prednisone EP Impurity K CAS 7738-93-4
| CAS No. | 7738-93-4 |
| Molecular Formula | C19H22O3 |
| Molecular Weight | 298.38 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Prednisone EP Impurity K (CAS 7738-93-4), a pharmacopoeial impurity reference standard (molecular formula C19H22O3, MW 298.38 g/mol) used for the identification and quantification of trace impurities in APIs.
Structurally, Prednisone EP Impurity K (C19H22O3) contains a steroid core, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 9.0, corresponding to approximately 9 ring(s) or double-bond equivalent(s). With a molecular weight of 298.38 g/mol, it falls into the medium-molecular-weight range. 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 | C19H22O3 |
| Molecular Weight | 298.38 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 chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1959 |
Related Prednisone Standards
- Prednisone Impurity 10 (CAS 103335-31-5)
- Prednisone EP Impurity D (CAS 10184-69-7)
- Prednisone EP Impurity J (CAS 78261-67-3)
- Prednisone EP Impurity C (CAS 70522-55-3)
- Prednisone Impurity 7 (CAS CATO-C4X-16947)
- Prednisone (CAS 53-03-2)
- Prednisone Impurity 16 (CAS 15714-29-1)
- Prednisone-d4 (Major) (CAS CATO-CCAD303314)
Recommended Standards
- Exemestane EP Impurity F (CAS 72648-46-5)
- Dopamine Impurity 61 (CAS CATO-C4X-190861)
- Atomoxetine Impurity 23 (CAS CATO-C4X-155023)
- Granisetron Impurity 24 (CAS CATO-C4X-197024)
- Lidocaine Impurity 86 (CAS CATO-C4X-167986)
- Evocalcet impurity 58 (CAS 2381242-86-8)
- Duloxetine EP Impurity A (CAS 116539-60-7)
- 2-(Pyridin-2-yl)-4-(pyridin-4-yl)pyrimidine-5-carbohydrazide (CAS 400077-54-5)
- N-(4-bromophenyl)-3-nitropyridin-2-amine (CAS 78750-60-4)
- 2-(Furan-2-yl)-1-(2-methoxyphenyl)-2,3-dihydroquinazolin-4(1H)-one (CAS 106059-70-5)
- 2-(4-Methoxyphenoxy)-3-(3-(trifluoromethyl)phenyl)quinoline (CAS 337921-94-5)
- 3-Ethoxythiophene-2-carbonyl chloride (CAS 139926-24-2)
- 5-(3-Methoxybenzoyl)-2,3,4,5-tetrahydro-1H-1,5-benzodiazepin-2-one (CAS 866134-24-9)
- Q-Peptide trifluoroacetate salt (CAS 1361235-89-3)
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