Ursodeoxycholic acid impurity 63 CAS 81873-91-8
| CAS No. | 81873-91-8 |
| Molecular Formula | C24H38O5 |
| Molecular Weight | 406.56 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including Ursodeoxycholic acid impurity 63.
Ursodeoxycholic acid impurity 63 (CAS 81873-91-8) is a certified pharmaceutical impurity reference standard with the molecular formula C24H38O5 and a molecular weight of 406.56 g/mol.
Ursodeoxycholic acid impurity 63 (C24H38O5) contains a steroid core, a hydroxyl group, an ether linkage. 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.
As a certified reference material (CRM), Ursodeoxycholic acid impurity 63 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 | C24H38O5 |
| Molecular Weight | 406.56 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) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1980 |
Related Ursodeoxycholic Standards
- Ursodeoxycholic Acid EP Impurity G (CAS 10538-55-3)
- Ursodeoxycholic Acid Impurity 113 (CAS CATO-C4X-1422113)
- Ursodeoxycholic Acid Impurity 132 (CAS CATO-C4X-1422132)
- Ursodeoxycholic Acid EP Impurity B (CAS 81-25-4)
- Ursodeoxycholic Acid EP Impurity D (CAS 2955-27-3)
- Ursodeoxycholic acid impurity 55 (CAS CATO-C4X-142255)
- Ursodeoxycholic Acid-d5 Methyl Ester (CAS 93701-19-0)
- Ursodeoxycholic Acid-d5 (CAS 93701-18-9)
Recommended Standards
- Acetaminophen Impurity 45 (CAS 61578-86-7)
- Chenodeoxycholic Acid Impurity 4 (CAS CATO-C4X-15834)
- Cholic Acid Impurity 79 (CAS 111137-23-6)
- Levonorgestrel Impurity 37 (CAS 2762739-31-9)
- Azilsartan Impurity 119 (CAS CATO-C4X-1096119)
- Atrasentan Impurity 181 (CAS 1073590-82-5)
- Pentoxifylline Impurity 9 (CAS 1597448-45-7)
- 3-((4-Bromo-3-methylphenyl)amino)-1-(3,4-dichlorophenyl)propan-1-one (CAS 477320-61-9)
- Ethyl 3-(3-bromophenyl)propiolate (CAS 1289203-51-5)
- [(2,6-Dichlorophenyl)methyl][(E)-[(dimethylamino)methylidene]amino]dimethylazanium chloride (CAS 317377-45-0)
- 1-(6-Methoxy-pyrimidin-4-yl)-pyrrolidin-3-ol (CAS 1353984-40-3)
- 3-[(2,5-Dichlorophenoxy)methyl]pyrrolidinehydrochloride (CAS 1220031-67-3)
- N-(N-(3,4-dimethylphenyl)carbamimidoyl)hydrazinecarboximidamide hydrochloride (CAS 1171647-17-8)
- Semaglutide impurity 289 (CAS CATO-C4X-2226289)
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