Ursodeoxycholic acid impurity 25 CAS 4185-00-6
| CAS No. | 4185-00-6 |
| Molecular Formula | C24H38O4 |
| Molecular Weight | 390.56 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
Ursodeoxycholic acid impurity 25 (CAS 4185-00-6) is a certified pharmaceutical impurity reference standard with the molecular formula C24H38O4 and a molecular weight of 390.56 g/mol.
The molecular framework of Ursodeoxycholic acid impurity 25 (C24H38O4) is characterized by a steroid core, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by its high hydrophobicity (logP), which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
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 | C24H38O4 |
| Molecular Weight | 390.56 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 chloroform, dichloromethane, ethyl acetate, DMSO |
| 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.) | 1958 |
Related Ursodeoxycholic Standards
- Ursodeoxycholic Acid Impurity 22 (CAS 67008-26-8)
- Ursodeoxycholic Acid EP Impurity F (CAS 4651-67-6)
- Ursodeoxycholic Acid impurity 103 (CAS CATO-C4X-1422103)
- Ursodeoxycholic Acid impurity 104 (CAS CATO-C4X-1422104)
- Ursodeoxycholic Acid impurity 108 (CAS 1144012-08-7)
- Ursodeoxycholic Acid Impurity 112 (CAS CATO-C4X-1422112)
- Ursodeoxycholic Acid Impurity 116 (CAS 67733-54-4)
- Ursodeoxycholic Acid Impurity 127 (CAS CATO-C4X-1422127)
Recommended Standards
- Ursodeoxycholic Acid Impurity 129 (CAS CATO-C4X-1422129)
- Ursodeoxycholic acid impurity 27 (CAS 77059-13-3)
- Ursodeoxycholic acid impurity 27 (CAS 77060-26-5)
- Ursodeoxycholic acid impurity 61 (CAS 110107-03-4)
- Metoclopramide impurity 60 (CAS 1242047-97-7)
- Peramivir Impurity 117 (CAS CATO-C4X-1833117)
- Polaprezinc impurity 25 (CAS CATO-C4X-182125)
- (S)-2-Amino-N-((S)-1-benzylpyrrolidin-3-yl)-N-ethylpropanamide (CAS 1401666-30-5)
- 6-Bromobenzo[d][1,3]dioxole-4-carboxylic acid (CAS 72744-57-1)
- Ethyl 2-(4-butoxyphenyl)-2-oxoacetate (CAS 100972-51-8)
- benzyl[3-(difluoromethoxy)propyl]amine (CAS 1593441-93-0)
- 2-Amino-2-(4-nitrophenyl)acetic acid (CAS 5407-25-0)
- 2-Pentylquinolin-4-ol (CAS 62869-70-9)
- Tirzepatide Impurity 52 (CAS CATO-C4X-324052)
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