Ipratropium Impurity 22 CAS 3979-14-4
| CAS No. | 3979-14-4 |
| Molecular Formula | C11H14O3 |
| Molecular Weight | 194.23 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a process- or degradation-related impurity, Ipratropium Impurity 22 (CAS 3979-14-4, C11H14O3) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Owing to a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system, Ipratropium Impurity 22 is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 194.23 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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.
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 | C11H14O3 |
| Molecular Weight | 194.23 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | >95% |
| Storage | Store at 2-8°C, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
Related Ipratropium Standards
- Ipratropium Impurity 17 (CAS 17838-69-6)
- Ipratropium Impurity 11 (CAS 5894-79-1)
- Ipratropium Impurity 25 (CAS CATO-C4X-166525)
- Ipratropium Impurity 30 (CAS 259092-15-4)
- Ipratropium Impurity 31 (CAS 3423-25-4)
- Ipratropium Bromide Impurity 36 (CAS CATO-C4X-166536)
- Ipratropium Bromide EP Impurity C (CAS 552-63-6)
- Ipratropium Bromide EP Impurity D (CAS 492-38-6)
Recommended Standards
- Safinamide impurity 49 (CAS 1843368-38-6)
- Minoxidil EP Impurity C (CAS 1798387-81-1)
- Safinamide Impurity 24 (CAS CATO-C4X-159024)
- Fexofenadine impurity 43 (CAS CATO-C4X-179443)
- Mosapride Impurity 49 (CAS CATO-C4X-104449)
- Dicloxacillin impurity 2 (CAS CATO-C4X-16152)
- Alogliptin Impurity 41 (CAS 3177-80-8)
- n,3-Dicyclopropyl-1,2,4-oxadiazol-5-amine (CAS 1249308-26-6)
- 2-(4-Bromophenyl)-2h-1,2,3-triazol-4-amine (CAS 43099-01-0)
- 2-Amino-3-methoxypyridine (CAS 10201-71-5)
- 3-Oxo-2,3-dihydro-1h-indene-5-sulfonamide (CAS 702693-72-9)
- 4-(Benzyloxy)-3-methoxy-benzyl Alcohol (CAS 33693-48-0)
- (2S,4S)-4-(Fluoro-18F)pyrrolidine-2-carboxylic acid (CAS 229980-56-7)
- Semaglutide Impurity 3 (CAS CATO-C4X-22263)
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