Dopamine Impurity 32 CAS 138-65-8
| CAS No. | 138-65-8 |
| Molecular Formula | C8H11NO3 |
| Molecular Weight | 169.18 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Structurally, Dopamine Impurity 32 (C8H11NO3) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 4.0, corresponding to approximately 4 ring(s) or double-bond equivalent(s). With a molecular weight of 169.18 g/mol, it falls into the medium-molecular-weight range. 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).
As a process- or degradation-related impurity, Dopamine Impurity 32 (CAS 138-65-8, C8H11NO3) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
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.
As a certified reference material (CRM), Dopamine Impurity 32 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 | C8H11NO3 |
| Molecular Weight | 169.18 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (faint amine-like odor) |
| Purity | >90% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 1 |
Related Dopamine Standards
- Dopamine EP Impurity A (CAS 3213-30-7)
- Dopamine EP Impurity B (CAS 554-52-9)
- Dopamine Impurity 17 (CAS 1129-53-9)
- Dopamine Impurity 81 (CAS 68929-11-3)
- Dopamine Impurity 82 (CAS 5663-54-7)
- Dopamine Impurity 83 (CAS CATO-C4X-190883)
- Dopamine Impurity 84 (CAS CATO-C4X-190884)
- Dopamine Impurity 99 (CAS CATO-C4X-190899)
Recommended Standards
- Pyridoxine impurity 82 (CAS CATO-C4X-187782)
- Tetrabenazine Impurity 5 (CAS 2353670-45-6)
- Pyridoxine Impurity 15 (CAS CATO-C4X-187715)
- Ipronidazole (CAS 14885-29-1)
- Tadalafil Impurity 57 (CAS CATO-C4X-108757)
- Indometacin Impurity 22 (CAS 78458-34-1)
- Crotamiton Impurity 4 (CAS CATO-C4X-19564)
- 4-((2,4-Difluorophenyl)amino)-4-oxobutanoic acid (CAS 193952-12-4)
- But-3-ene-1,3-diyldibenzene (CAS 16606-47-6)
- 6-Aminoindolin-2-one (CAS 150544-04-0)
- Methyl 3-(1-(aminomethyl)cyclohexyl)propanoate hydrochloride (CAS 2760521-66-0)
- 3-Nitrobenzoic-d4 Acid (CAS 78399-78-7)
- 3-Chloro-6-(trifluoromethyl)pyridine-2-methanol (CAS 1227584-33-9)
- Semaglutide impurity 28 (CAS CATO-C4X-222628)
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