Retinol Impurity 4 CAS 801-72-9
| CAS No. | 801-72-9 |
| Molecular Formula | C22H32O3 |
| Molecular Weight | 344.49 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), Retinol Impurity 4 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.
CATO supplies Retinol Impurity 4 (CAS 801-72-9), a pharmacopoeial impurity reference standard (molecular formula C22H32O3, MW 344.49 g/mol) used for the identification and quantification of trace impurities in APIs.
Based on its molecular formula C22H32O3, Retinol Impurity 4 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 344.49 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).
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
Physical & Chemical Properties
| Molecular Formula | C22H32O3 |
| Molecular Weight | 344.49 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | 97%+ |
| 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
Related Retinol Standards
Recommended Standards
- Rel-(3aR,4R,7S,7aS)-4-methyl-3a,4,7,7a-tetrahydro-4,7-epoxyisobenzofuran-1,3-dione (CAS 6766-45-6)
- sn-1,2-Dioctanoylglycerol (CAS 60514-48-9)
- Progesterone Impurity N3 (CAS 5327-60-6)
- tert-Butyl 3-((4,4-diethoxybutyl)amino)piperidine-1-carboxylate (CAS 864684-94-6)
- Lamivudine Impurity B((2R,5R)-Isomer) (CAS 139757-68-9)
- Olaparib Impurity 7 (CAS CATO-C4X-11357)
- Acamprosate EP Impurity B Calcium Salt (Acamprosate USP Related Compound B) (CAS 3093141-49-9)
- 4,5-Dichlorofuran-2-carbonitrile (CAS 1403566-73-3)
- 2-(Aminomethyl)-3-(difluoromethyl)-6-methoxypyridine-4-carboxylic acid (CAS 1361902-41-1)
- Atomoxetine Hydrochloride EP Impurity B (CAS 82857-39-4)
- N-(3-Aminophenyl)-2-(3-methylphenoxy)butanamide (CAS 1020722-35-3)
- 3-(Chloromethyl)-1-ethyl-5-(trifluoromethyl)-1H-pyrazole (CAS 1260659-15-1)
- Zinc(II) Gluconate Hydrate (CAS 4468-02-4)
- Semaglutide impurity 57 (CAS 2773558-06-6)
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