Cholesterol Impurity 31 CAS 117556-83-9
| CAS No. | 117556-83-9 |
| Molecular Formula | C27H44O |
| Molecular Weight | 384.64 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 Cholesterol Impurity 31.
As a process- or degradation-related impurity, Cholesterol Impurity 31 (CAS 117556-83-9, C27H44O) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Cholesterol Impurity 31 (C27H44O) contains a steroid core, a hydroxyl group, an ether linkage. Its high carbon-to-hydrogen ratio confers good lipid solubility; 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.
CATO manufactures Cholesterol Impurity 31 under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C27H44O |
| Molecular Weight | 384.64 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | 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.) | 1990 |
Related Cholesterol Standards
- Cholesterol EP Impurity C (CAS 651-54-7)
- Cholesterol Impurity 17 (CAS 14214-69-8)
- Cholesterol Impurity 29 (CAS 881024-99-3)
- Cholesterol Impurity 30 (CAS 17608-47-8)
- Cholesterol probe for Smoothened (CAS CATO-C3D-262450)
- Cholesterol Impurity 25 (CAS CATO-C4X-196725)
- Cholesterol Impurity 36 (CAS 7199-91-9)
- Cholesterol EP Impurity A (CAS 80-99-9)
Recommended Standards
- Desmosterol (CAS 313-04-2)
- 3-Keto Cholesterol (CAS 601-54-7)
- 8-Dehydrocholesterol (CAS 70741-38-7)
- 4-Cholesten-3-One (CAS 601-57-0)
- Piperazine Impurity 13 (CAS CATO-C4X-126513)
- Sodium Fusidate EP Impurity H (CAS 16711-91-4)
- Relugoli Impurity 145 (CAS CATO-C4X-2429145)
- 6-(Aminomethyl)pyridin-2-amine trihydrochloride (CAS 380394-86-5)
- tert-Butyl (3-bromo-6-chloropyridin-2-yl)carbamate (CAS 1260793-39-2)
- ((5-Chlorobenzo[b]thiophen-3-yl)methyl)triphenylphosphonium bromide (CAS 175203-96-0)
- 2-Methyl-2H-pyrazolo[3,4-d]pyrimidin-4-amine (CAS 21230-48-8)
- 4,4'-Dioctyl-2,2'-bithiophene (CAS 120762-66-5)
- 3-(1',3'-Dimethyl-5-(trifluoromethyl)-1'h,2h-[3,4'-bipyrazol]-2-yl)propanenitrile (CAS 1170836-29-9)
- (DTyr27,36,DThr32)-Neuropeptide Y (27-36) (CAS 163887-48-7)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com