Prednisolone impurity 56 CAS CATO-C4X-173756
| CAS No. | CATO-C4X-173756 |
| Molecular Formula | C21H29O8P |
| Molecular Weight | 440.42 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Prednisolone impurity 56 (CAS CATO-C4X-173756) is a certified pharmaceutical impurity reference standard with the molecular formula C21H29O8P and a molecular weight of 440.42 g/mol.
The molecular framework of Prednisolone impurity 56 (C21H29O8P) is characterized by a flavonoid core, a phosphate ester group, a hydroxyl group, an ether linkage. 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 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 | C21H29O8P |
| Molecular Weight | 440.42 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | 97%+ |
| 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) | 7.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
Related Prednisolone Standards
- Prednisolone Phosphate - API Standards (CAS 302-25-0)
- Prednisolone Impurity 20 (CAS CATO-C4X-173720)
- Prednisolone Impurity 21 (CAS CATO-C4X-173721)
- Prednisolone Impurity 23 (CAS CATO-C4X-173723)
- Prednisolone Impurity 24 (CAS CATO-C4X-173724)
- Prednisolone 21-Methanesulfonate (CAS 35410-28-7)
- Prednisolone EP Impurity A Hydrochloride (CAS 393782-60-0)
- Prednisolone Impurity 31 (CAS 6677-19-6)
Recommended Standards
- 2-(-2-((-(2-Hydroxy-5-sulfophenyl)diazenyl)-(phenyl)methylene)hydrazinyl)benzoic acid (CAS 135-52-4)
- (S)-2-(7-Nitrodibenzo[b,d]furan-2-sulfonamido)-3-phenylpropanoic acid (CAS 98044-79-2)
- Methyl 2-((2-nitrodibenzo[b,f][1,4]oxazepin-10(11H)-yl)sulfonyl)benzoate (CAS 866157-21-3)
- Tedizolid Impurity 16 (CAS 1700656-54-7)
- Lemborexant Impurity 37 (CAS 1369767-26-9)
- Budesonide Impurity 67 (CAS CATO-C4X-138967)
- Dl-Lysine Acetylsalicylate EP Impurity C (CAS 2924449-37-4)
- 3-Amino-3-(4-hydroxyphenyl)propanoic Acid (CAS 6049-54-3)
- 5-(4-Bromobenzyl)-1,3,4-thiadiazol-2-amine (CAS 329921-62-2)
- N,N-Diphenylbenzothioamide (CAS 17435-12-0)
- 3-(4-(2-Methyl-1H-imidazol-1-yl)butyl)-1,2,4-triazine (CAS 791856-82-1)
- 1-Methylcyclohexyl bicyclo[2.2.1]hept-5-ene-2-carboxylate (CAS 279243-78-6)
- 5-(Benzyloxy)-3-bromo-1h-indole (CAS 569337-39-9)
- (D-Trp32)-Neuropeptide Y (porcine) trifluoroacetate salt (CAS 153549-78-1)
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