Tocopheryl Impurity 21 (Mixture of Isomers) CAS 37570-32-4
| CAS No. | 37570-32-4 |
| Molecular Formula | C31H52O3 |
| Molecular Weight | 472.74 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Tocopheryl Impurity 21 (Mixture of Isomers) (CAS 37570-32-4) is a certified pharmaceutical impurity reference standard with the molecular formula C31H52O3 and a molecular weight of 472.74 g/mol.
Tocopheryl Impurity 21 (Mixture of Isomers) (C31H52O3) contains a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. Its high carbon-to-hydrogen ratio confers good lipid solubility, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
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.
As a certified reference material (CRM), Tocopheryl Impurity 21 (Mixture of Isomers) 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 | C31H52O3 |
| Molecular Weight | 472.74 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | >95% |
| Storage | Store at room temperature, 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.) | 1967 |
Related Tocopheryl Standards
Recommended Standards
- Tocopherol Impurity 20 (CAS 7695-91-2)
- Tocopherol Impurity 36 (CAS CATO-C4X-119536)
- All-rac-alfa-Tocopheryl Acetate EP Impurity A（and Diastereoisomers） (CAS CATO-C4X-119518)
- All-Rac-Α-Tocopheryl Acetate EP Impurity B (CAS CATO-C4X-177916)
- Doxylamine impurity 25 (CAS 15260-65-8)
- Rifaximin EP Impurity D (CAS CATO-C4X-15054)
- Peptide Impurity 13 (CAS CATO-CPTD788813)
- (3AS,4R,6R,7R,7aR)-6-(benzyloxy)-4-(hydroxymethyl)-2,2-dimethyltetrahydro-4H-[1,3]dioxolo[4,5-c]pyran-7-ol (CAS 14897-51-9)
- 3-((Diethylamino)methyl)-5,5-diphenyldihydrofuran-2(3H)-one (CAS 99761-11-2)
- 912656-34-9 XEN 907 XEN907 ; XEN-907 BCP23954 (CAS 912656-34-9)
- (5-(4-(Trifluoromethyl)phenyl)pyridin-3-yl)methanol (CAS 885959-16-0)
- 2-(2-Oxo-1,2-dihydropyridin-3-yl)piperidine-1-carbaldehyde (CAS 1352494-23-5)
- 5-(4-Methylthiophen-2-yl)isoxazole (CAS 138716-42-4)
- Semaglutide impurity 247 (CAS CATO-C4X-2226247)
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