Cholic Acid Impurity 28 CAS CATO-C4X-116028
| CAS No. | CATO-C4X-116028 |
| Molecular Formula | C28H36O2 |
| Molecular Weight | 404.58 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.
CATO supplies Cholic Acid Impurity 28 (CAS CATO-C4X-116028), a pharmacopoeial impurity reference standard (molecular formula C28H36O2, MW 404.58 g/mol) used for the identification and quantification of trace impurities in APIs.
Based on its molecular formula C28H36O2, Cholic Acid Impurity 28 contains a steroid core, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 404.58 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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).
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 | C28H36O2 |
| Molecular Weight | 404.58 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at room temperature, protect from light |
| 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) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
Related Cholic Standards
- Cholic Acid Impurity 27 (CAS CATO-C4X-116027)
- Cholic Acid Impurity 52 (CAS 68170-81-0)
- Cholic Acid impurity 75 (CAS 2862-62-6)
- Cholic Acid Impurity 13 (CAS 2304-92-9)
- Cholic Aicd Impurity 17 (CAS 2304-91-8)
- Cholic Acid Impurity 18 (CAS 517-33-9)
- Cholic Acid Impurity 19 (CAS 2304-89-4)
- Cholic Acid Impurity 78 (CAS 79732-73-3)
Recommended Standards
- Obeticholic Acid Impurity 15 (CAS 10538-59-7)
- Methyl 7-β-Hydroxy-3-ketocholanoate (CAS 67371-28-2)
- Ledipasvir Impurity 57 (CAS CATO-C4X-331357)
- Hexadecyl β-d-glucopyranoside, 98% (CAS 54549-27-8)
- Terbutaline impurity 133 (CAS CATO-C4X-1183133)
- Mitoxantrone EP Impurity D HCl (CAS 261164-09-4)
- Cefixime EP Impurity F (CAS 79368-95-9)
- Ethyl 3-amino-2-(isopropylamino)isonicotinate (CAS 1468758-85-1)
- n-(Naphthalen-2-ylmethyl)cyclopropanamine (CAS 926228-63-9)
- 4-[4-(2-Methoxyethoxy)phenoxy]benzoic acid (CAS 887412-01-3)
- (4S)-Ethyl 4-methyl-2-oxocyclohexanecarboxylate (CAS 218158-68-0)
- 6-Bromo-N-(4-fluorophenyl)-2,3,4,9-tetrahydro-1H-carbazol-1-amine (CAS 812649-22-2)
- 4,6-Dibromo-2,3-difluorophenylacetonitrile (CAS 1804939-10-3)
- Allo-Thr7-Tirzepatide (CAS CATO-CPTD788933)
Why CATO?
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- 130,000+ catalog items in stock, COA supplied with every batch
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