Deoxycholic acid Impurity 28 CAS 2309-12-8
| CAS No. | 2309-12-8 |
| Molecular Formula | C27H44O5 |
| Molecular Weight | 448.64 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 Deoxycholic acid Impurity 28.
Deoxycholic acid Impurity 28 (CAS 2309-12-8) is a certified pharmaceutical impurity reference standard with the molecular formula C27H44O5 and a molecular weight of 448.64 g/mol.
Deoxycholic acid Impurity 28 (C27H44O5) 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).
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.
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 | C27H44O5 |
| Molecular Weight | 448.64 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.) | 1957 |
Related Deoxycholic Standards
- Deoxycholic acid C16 (CAS 1311972-97-0)
- Deoxycholic acid Impurity 16 (CAS CATO-C4X-335916)
- Deoxycholic acid Impurity 11 (CAS CATO-C4X-335911)
- Deoxycholic acid Impurity 23 (CAS 21066-15-9)
- Deoxycholic acid Impurity 24 (CAS 73505-50-7)
- Deoxycholic acid Impurity 38 (CAS CATO-C4X-335938)
- Deoxycholic acid Impurity 15 (CAS 1093351-39-3)
- Deoxycholic acid Impurity 41 (CAS CATO-C4X-335941)
Recommended Standards
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- Pitavastatin Impurity 92 (CAS 1159588-21-2)
- Methyl 3-amino-2-(4-fluorophenoxy)propanoate hydrochloride (CAS 1423032-11-4)
- 4,6-Difluoro-1H-indole-3-carbaldehyde (CAS 1158418-22-4)
- Liraglutide Impurity 31 (CAS CATO-C4X-199231)
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